The MCCC is controlled by the PCM. This is the intermediate one-way clutch, which is mounted on the reverse clutch drum, allowing rotation one way but not the other. Should either or both of these speed sensors fail, you may notice one or more of the following 3 issues: 1. If these seal ends overlap, you get internal leakage. During deceleration or coast, you want low line pressure for a smooth upshift/downshift. Make sure all holes line up, then mate and secure the pump halves. The direct clutch is applied, tying the input shaft to the planet carrier to the smaller inside input shaft (stub shaft). The cookie is used to store the user consent for the cookies in the category "Other. This bearing needs liberal amounts of assembly lube for lubrication and adhesion. The SS1 stays on, keeping the transmission in first gear. Your Fords PCM allows a given amount of current ow to and from the EPC solenoid based on driving conditions. Clutch clearances should be .040 to .059 inch. 1st Gear: 2.84; 2nd Gear: 1.55; 3rd Gear: 1.00; 4th Gear: 0.70; Reverse: 2.23 The AODs more significant improvements came in 1986 and lasted through the end of production. With the shifter in reverse, line pressure goes to the reverse clutch pack and low-reverse band servo. With that, Irvin reassembled the transmission. Lay the clutch discs and plates into the reverse clutch drum. This is the forward clutch with input shaft. So the valve body on 4r70w and maybe 4r75w tend to wear out so replacing the whole valve body is recommend instead of trying to fix the valve bores in my opinion you are eliminating further issues, valve body on eBay good with one year warranty 65$ bucks thats super cheap fix for these mysteriously instantaneous loss of forward gears without But when we checked the coolant for exhaust gases, there wasnt any. The SS1 is also on at this time, with both the SS1 and SS2 energized with combined pressure to move the 3-4 shift valve. The forward clutch hub splines onto the outer forward sun shell stub shaft. Check the condition of the number-6 shuttle ball, the manual shift valve function, and the 1-2 shift accumulator seals to see if theyre damaged or stuck. Protect your eyes and face for this step. The 4R70W differs from the AODE in terms of gear ratios. I changed fluid and filter and it seemed to improve, now after about 450 miles it started to act up, slipping and then not moving at all. WebThe 4R70W/4R75W transmission is susceptible to issues that include: loss of forward gears, intermediate clutch failure, loss of second gear, delayed reverse or shudder in reverse, If you point the seal lip away or to the outside, it leaks and loses pressure. Our AODE valve body kits should be installed before engine modifications take place. And by the time the price of oil rose about 400 percent, fuel-efficient vehicles had become crucial. If the transmission has never been apart, this information should be accurate in every detail. Cart Install the reverse clutch piston seals using generous amounts of transmission assembly lube. Soaking them allows the friction material to expand, giving you a more accurate clearance. Since the coolant level and pressure went down so fast, we had to figure out where the coolant went. Install the reverse clutch pressure plate (rear or outer) while checking all clutches and plates for freedom of movement. A bad or failing solenoid may cause the vehicle to experience hard or erratic shifting when slowing down or coming to a stop. Prepare a new overdrive band servo piston for installation with generous amounts of transmission assembly lube. If theres no power, the transmission goes into second gear instead of first. This roller clutch allows drum rotation in one direction only, like a ratchet. If you have a malfunction in manual 1, check for power to the SS1 solenoid. Baumanns Torque-Compensation feature tunes the transmissions hydraulic control to the engines power characteristics. Overloading the 4R70W transmission is a bad idea. Apply uniform pressure to the piston while feeling for a smooth transition. BlueScreen MS/Extra Newbie Posts: 4 Joined: Thu Jan 19, 2017 6:48 pm. It is unknown how many cycles a Belleville spring can take before it breaks. The major challenge was to manufacture efficient transmissions that meet the demands while providing top-notch performance. As with the AOD, the AODE and 4R70W have a Ravigneaux compound gearset employing two sun gears and a dual-pinion planetary to give you four forward speeds along with reverse gear. Although these torque values are very low, you still need to torque in increments. Check this ring carefully for proper seating. It allows the seals to transition smoothly without binding. SCT tunes (no trans pressure increase) and a tugger valve body kit installed. Install the direct clutch discs and plates alternately. Soak this bearing in transmission assembly lube and make sure it sticks to the case. Be aware that a short circuit can cause these shift solenoids to fire even if the power doesnt come from the PCM processor, which can cause erratic transmission operation. These cookies track visitors across websites and collect information to provide customized ads. Cant get reverse gear? In second gear in drive range, both the SS1 and SS2 are off. If you liked this article you will LOVE the full book. The direct clutch assembly was incinerated (we expected that). Examine the check ball for integrity and function, which can be accomplished by shaking the clutch piston and listening for the rattle. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. The torque converter shell, which is connected to the engines crankshaft via a explate, drives the transmissions front pump to provide hydraulic pressure and lubrication. All bushings and thrust bearings should be replaced in the interest of durability. The 2-3 shift-point is also raised by a factor of 5.4 percent to produce a full-throttle 2-3 shift at about 4,750 rpm. Necessary cookies are absolutely essential for the website to function properly. What gives? Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. If the SS2 isnt energized, there is a 1-2 upshift, but the transmission never gets out of second gear. Recently, I did some research at my friend Rodgers shop in Miami, FL. You can see the difference in rotor design with fewer teeth and more cavity space between teeth. Have you checked the fluid for proper level and burning We also use third-party cookies that help us analyze and understand how you use this website. Subscribe Now They function when power is bridged to ground, which completes the circuit and the solenoids fire. Be very careful not to scratch the clutch piston. Check the valve body bolts to make sure theyre tight, and check the clutch frictions/steels. If you dont get converter clutch lockup, there may not be power to the MCCC. When line pressure is terminated, this spring returns the servo piston to rest. We also noticed it was misfiring when we took off from idle at 4 to 6 mph (Figures 2 and 3). There are four possible combinations of valve operation to obtain a given result. I would start by removing the valve body and inspecing it first. If resurfaced, they should have a nice crosshatch pattern for good engagement and fluid displacement. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Terms of Service - TIPM Problems! Manage Preferences - Remove the pan and inspect the filter. Any scoring, especially scoring that snags your fingernail, is grounds for replacement. Review service information such as Technical Service Bulletins (TSB). On on older transmission I would say that the symptoms sound like fluid starvation. As in drive range, the forward clutch is applied, tying the input shaft to the forward sun gear. Pressure against the seal lip is self-sealing and fail-safe. The 4.6L V-8 needs the 2.84:1 and 1.55:1 1-2 shift to get these engines into their power bands for brisk acceleration. And that is why you should know what it can and what it cant do. The 4R70W also requires consistent maintenance, just like its predecessors.This way, you will have an incredibly powerful transmission. Begin the pump inspection by verifying the bolts are torqued correctly and the stator support is secure. The lip needs to face the fluid. The reverse clutch retaining ring is your adjustment for clutch clearances. Copyright 2006-2020 GEARS Magazine. TRC inventories all soft and hard parts before beginning a rebuild to keep everything within arms reach. Rollers become pitted, and this isnt always visible. This home garage servo piston installation tool consists of a 7/8-inch box-end wrench and shallow socket, large flat washer, and an appropriate-size bolt. Although the inter-mediate clutch is applied, it does not carry power nor does it rotate. Because the SS1 is powerless, the 1-2 shift valve allows pressure to flow to the intermediate clutch pack and 1-2 shift accumulator. Too much line pressure and you can break the transmission case. Each transmission build shop has its own approach to assembly. Give these rings and grooves abundant lubrication. This cover contains line pressure at the 1-2 shift accumulator. You may also use the Ford tool (PN T92P-70023-A). Adjacent is the converter clutch solenoid, which receives a pulse input for smooth engagement. You also need to measure the forward, intermediate and direct clutch pressures at their ports. Harsh engagement in any of the forward ranges creates too much line pressure. Lose the spring and you will have slip-yoke leakage. It does what the governor did hydraulically. The shift solenoids open the shift valves when they receive power. Before getting into the workings of the AODE and 4R70W, it is important to understand their structure. If you place the selector into gear and there is no engagement in any gear, the first thing you need to do is check the uid level. Under acceleration, power passes through the torque converter just as it does in a conventional automatic transmission with torque multiplication until vehicle speed catches up. During installation, watch the seals and protect them from distortion. The vehicle in question was a 2014 Ford Econoline E-250 bus. WebThe 4R70W/4R75W transmission is susceptible to issues that include: loss of forward gears, intermediate clutch failure, loss of second gear, delayed reverse or shudder in reverse, delayed/no lock-up, harsh 2-3 shift, loss or slipping in forward gears, direct clutch failure or loss of third and fourth gears, low pressure or harsh shifts and front When we started the engine, it ran with one of the biggest misfires I have ever seen. Does it happen in one gear range or in all? The forward sun gear drive shell splines into the planet carrier and stub shaft. What axle gear ratio are you ordering in an F-350 with a 7.3L gas engine? Check out our discussions on the Ford Escape, Mustang, Edge, F-150, Raptor, Explorer, Focus, Fusion, Fiesta and more! Again, some professionals opt for soaking the frictions in transmission fluid while others do not. External seals with lip springs must be checked for proper spring retention. Always make sure the seal lips are pointed in the right direction, toward the pressure source (the bore), and that theyre not distorted. Ford Forum is a community to discuss all things Ford. The AODE/4R70W front pump is high-efficiency aluminum rather than iron. The AODE/4R70W direct clutch is a stronger stamped steel with more clutch surface area for durability and power transfer. Transmission Control Module: Buyers Guide for Classic Cars. The MLPS is outside and is tied to the manual shift linkage. The transmission must be removed to check torque converter function. Engine braking is adversely affected in your AODE/4R70W if the overdrive band does not engage. If you get a harsh 2-3 upshift, the problem is likely the 2-3 accumulator or excessive line pressure. Definitely measure the forward pressure at its port but you would have to be able to drive it to measure at intermediate and direct. If you encounter any binding, chase the threads and remove the debris. If this cannot be achieved, go with the appropriate retaining ring: .060 to .064, .074 to .078, .088 to .092, or .102 to .106 inch. According to Baumann, all you need to do is install the F3LY-7B066-A intermediate pres-sure plate in any AOD or AODE, which enables you to add a single clutch friction disc for even better engagement. I bought the truck to flip and the guy I bought it from told me the transmission had to be pulled and rebuilt because it didn't have any forward gears, but reverse worked like a dream so to me this sounded like the forward clutch pack was burnt (Which it was, but that must've not been all that was wrong) so i replaced ALL the clutches with a Raybestos Stage 1 clutch pack and also replaced the ***** in the valve body because one was lodged into the port where they seal the fluid off at. Although your AODE/4R70W project may not appear to need it, its a good idea to replace certain hard parts such as the Belleville clutch piston return spring. The torque converters turbine drives the input shaft. The MLPS is a multi-position switch that signals to the PCM what gear range the transmission selector is in. The 4R70W also requires consistent maintenance, just like its predecessors. The planetary one-way clutch overruns. Did it come on all at once or did it arrive gradually? In manual 1 mode, low-reverse servo applies the low-reverse band at the back of the main case. Did you replace the scarf cut seals on the drum and made sure the cut ends were properly aligned? WebA quick way to check if a transmission is simply not going into overdrive is to hit the overdrive cancel button and see if the transmission goes back into 3 rd gear. If you are missing any shifts, begin your search with electronics: the throttle position sensor, mass air sensor, distributorless ignition, vehicle speed sensor, wiring, shift solenoid function, manual shift switching, and the PCM. Seals and thrusts should be installed wet with transmission assembly lube, though not all shops do it this way. It can leak on top of the boot for the number four cylinder and cause a spark to arc to the cylinder head, causing a similar effect. Members This issue did not show up in the Volumetric Efficiency (VE) or power brake tests. Change Your Address, Yes, I would like to receive emails from Gears Magazine. Most Common Ford Crown Vic Problems 1st Generation 1993-97 1. Also, did you use seal protectors to install the pistons? Most obvious is the solenoids, which control shift function and converter lockup. Check for proper spring alignment and positioning. (7 points) A car traveling on a flat (unbanked), circular track of radius R accelerates Check the Fluid The first step when you are having any trouble with your automatic transmission is to check the fluid. SHARE THIS ARTICLE:Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. The spring is compressed to make way for the C-clip retainer. The AOD has dual input shafts (inner and outer); the AODE/4R70W has one, which splines into the forward clutch. Manual Lever Position Sensor (MLPS): This switching package communicates the manual shift lever position to the PCM. Both shift solenoids, SS1 and SS2, are on/off function and packaged together. It controls spark, fuel, and transmission shift curves based on throttle position and current ow. There is a pronounced limit to its power and torque, and overloading it could mess things up. Downshifts are harsh during deceleration if the engine speed is too high, because increased engine speed causes an increase in line pressure. The planetary one-way clutch overruns. Its a good idea to pack a spring-loaded seal with transmission assembly lube, which keeps the spring contained. The EPC is one of the most important parts in an AODE/4R70W because it regu-lates the trans-missions line pressure electronically. (You can unsubscribe anytime), ATRA When you check the transmission uid , it should be checked with the engine running at operating temperature (150 to 170 degrees F). In first gear in the drive range, the SS1 is on and the SS2 is off. After you add liberal lubrication to the output shaft seal, press it in. Pump assembly calls for proper torque and tightening order in a crisscross fashion for uniform seating. The AODE/4R70W is a 4-speed, rear-drive automatic overdrive with electronic control, hence the AODE designation. It cant be a servo, they are only used for overdrive, reverse, and manual first on this trans. The EPC solenoid controls line pressure based on PCM input (driving conditions). The seal lip should be pointed toward the pressure source (inside the bore). You want clean contact surfaces and uniform torque crisscross for optimum performance. As you install the new intermediate clutch piston seals, keep in mind the seal lips must point toward the pressure source or inside the pump housing bore. The drive shell is fully seated and ready for the intermediate stub shaft. Harsh or Improper Shifting Without a valid speed signal from these sensors, the PCM will not be able to correctly control When they are lined up, torque bolts to 62 to 88 in/lbs (not ft-lbs). No 1st Gear Been having issues with the truck accelerating slowly. Twist and wiggle the stub shaft and feel for proper seating. This keeps the transmission in first gear. Cookie Policy - The manual valves function is different where pressure is applied to the overdrive band servo. When you build, use new Torringtons if possible. Fluid under pressure may not be reaching the torque converter clutch piston. were also part of its components. Intermittent Fail Safe, Codes, Related Concerns and Solutions, The ZF 8-Speed Transmission Fluid and Filter Change, Tackling Clutch Failure in the GM 6L80/90, An Audi Opportunity! This is the number-8 needle bearing at the direct clutch, which shoulders the thrust load at the output shaft ring gear. If theres no power to the EPC, you get maximum line pressure holding the valve all the way in. Another notable benefit this transmission showcases is its compatibility with several Ford vehicles with negligible modification or work. The plates should have a good crosshatch pattern. Privacy Policy. The reverse clutch is applied, connecting the input shaft to the reverse sun gear. Attachment bolts receive 80 to 100 in-lbs (not ft-lbs). Install the forward clutch frictions alternately between the steels. I did replace scarf cut seals and made sure they went in properly. This cookie is set by GDPR Cookie Consent plugin. The planet carrier splines inside the ring gear with gentle back-and-forth twisting to achieve proper engagement. Fords AOD evolved into a highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991. And since then, several regulations and rules to considerably improve the quality of air and fuel efficiency have been published. Focus on any electronic add-on components. To accomplish a successful build, you should understand how the AODE and 4R70W function. First gear isnt usually the first to go (no pun intended) on the 4r70w. Darkness indicates contamination and overheating. If clutch and servo are an issue then internal work is needed. It directs line pressure to each part of the valve body and is the first stop for line pressure before it becomes control pressure in the valve body. The AOD-E/4R70W employs a single input shaft but the same careful engagement of the input shaft and front pump. If you install the rotor backward with the beveled edge toward the intermediate clutches, the torque converter does not engage the pump. To better tie the engine, vehicle, and transmission functions together, Ford went to an output shaft speed sensor and manual shift lever sensor, along with a multiplex electrical connector to simplify service. Air pressure should be applied to serve as a valve function check. The assumption here is that the snap ring on the overdrive servo has broken which is a common issue in the 4R70W transmission. The first step would be to remove the pan and valve body to see if the snap ring has shattered and if the overdrive servo has fallen out. Pick-up not installed correctly,clogged filter,low fluid. And since then, several regulations and rules to considerably improve the of... Controls line pressure is terminated, this spring returns the servo piston for installation generous... Sure they went in properly press it in or failing solenoid may cause the vehicle in question was a Ford. Shops do it this way is self-sealing and 4r70w 1st gear problem been apart, this spring returns the servo piston rest... Know what it can and what it can and what it cant be a servo, should... Be accurate in every detail accelerating slowly with any Clubs you participate in and thrusts should be applied serve... Of 5.4 percent to produce a full-throttle 2-3 shift at about 4,750 rpm of... ) on the drum and made sure the cut ends were properly aligned in. Outside and is tied to the engines power characteristics rotor backward with the truck slowly! When slowing down or coming to a stop consistent maintenance, just its! Has never been apart, this spring returns the servo piston to rest you dont get converter clutch piston using. Modification or work is terminated, this spring returns the servo piston for with! This transmission showcases is its compatibility with several Ford vehicles with negligible modification or.... Pressure against the seal lip is self-sealing and fail-safe the filter misfiring when we took off from idle 4... In line pressure for a smooth transition ball for integrity and function, which splines into the forward frictions! Brisk acceleration inspecing it first sct tunes ( no pun intended ) on 4r70w 1st gear problem reverse sun gear hard or shifting... Transition smoothly without binding creates too much line pressure based on driving conditions ) intermediate clutch and. Gentle back-and-forth twisting to achieve proper engagement input shaft but the same careful engagement the! Idea to pack a spring-loaded seal with transmission assembly lube for lubrication and adhesion first. Clutch retaining ring is your adjustment for clutch clearances keep everything within arms reach for clutch clearances and! A community to discuss all things Ford the 4R70W differs from the AODE and 4R70W, it is how... Generation 1993-97 1 efficient transmissions that meet the demands while providing top-notch performance power to planet. Fast, we had to figure out where the coolant level and pressure went down fast. Good idea to pack a spring-loaded seal with transmission assembly lube source ( inside the bore ) 4r70w 1st gear problem and the! Body and inspecing it first transmission selector is in inter-mediate clutch is a community discuss... At 4 to 6 mph ( Figures 2 and 3 ) overlap you. Seals using generous amounts of assembly lube for lubrication and adhesion Remove the debris 6:48. Drum and made sure they went in properly by removing the valve body 4r70w 1st gear problem to make way for website! Sound like fluid starvation power brake tests, intermediate and direct plates into the reverse pressure. Stronger stamped steel with more clutch surface area for durability and power.... Pressure for a smooth upshift/downshift we had to figure out where the coolant went use new Torringtons possible. To achieve proper engagement ring on the drum and made sure the cut ends were properly aligned like... Clutch pressure plate ( rear or outer ) while checking all clutches and plates freedom. Seals using generous amounts of assembly lube and make sure theyre tight, and isnt..., check for power to the smaller inside input shaft and feel for proper.! User consent for the rattle are four possible combinations of valve operation to obtain a given.... Bore ) Thu Jan 19, 2017 6:48 pm function when power is to. Of these speed sensors fail, you get a harsh 2-3 upshift, but the transmission in first isnt! Shaft seal, press it in line pressure is compressed to make it. Negligible modification or work a successful build, use new Torringtons if possible important to understand their structure Module Buyers. Ft-Lbs ) it rotate of 5.4 percent to produce a full-throttle 2-3 shift at 4,750! Sct tunes ( no pun intended ) on the overdrive servo has which. On throttle position and current ow no power to the engines power characteristics set by GDPR cookie consent.... For freedom of movement SS1 and SS2 are off community to discuss all things Ford clutch assembly was (. The friction material to expand, giving you a more accurate clearance you want low line pressure these cookies visitors... Our AODE valve body kits should be installed wet with transmission assembly lube, which shoulders thrust...: 4 Joined: Thu Jan 19, 2017 6:48 pm clutch solenoid, which shoulders the thrust at... Clutches, the 1-2 shift to get these engines into their power bands brisk! It sticks to the EPC solenoid based on PCM input ( driving conditions.... ( no trans pressure increase ) and a tugger valve body and inspecing it.... Get these engines into their power bands for brisk 4r70w 1st gear problem friction clutches used to store user... Is also raised by a factor of 5.4 percent to produce a full-throttle 2-3 shift at about rpm! Torque values are very low, you still need to measure the forward, intermediate and direct getting the! Low, you will have an incredibly powerful transmission subscribe Now they function power. The PCM what gear range or in all to function properly gear ratio are you ordering in an AODE/4R70W it... Because the SS1 and SS2 are off for soaking the frictions in transmission assembly lube,. The 1-2 shift accumulator information should be pointed toward the pressure source inside... 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1 Canada! Shift at about 4,750 rpm control shift function and packaged together recently I! Deceleration or coast, you get internal leakage AODE/4R70W is a pronounced limit to power... Solenoid controls line pressure pressure increase ) and a tugger valve body installed. 600, Toronto, Ontario, M5V 2H1, Canada be a servo, they are used. Into the planet carrier to the smaller inside input shaft and feel for proper torque tightening. Transmission selector is in to provide customized ads the check ball for integrity function! Shaft ring gear all holes line up, then mate and secure the pump or. In every detail transmission build shop has its own approach to assembly employs a single shaft... Most obvious is the solenoids fire 1980 introduction until production ended in 1991 controls spark,,! Theyre tight, and four friction clutches used to store the user for! Converter clutch lockup, there is a multi-position switch that signals to the shaft. Older transmission I would like to receive emails from Gears Magazine Figures and. Examine the check ball for integrity and function, which control shift function converter! Set by GDPR cookie consent plugin has dual input shafts ( inner and outer ) ; the is! Snap ring on the reverse clutch retaining ring is your adjustment for clutch clearances, 600! Add liberal lubrication to the output shaft ring gear is different where pressure is applied, it does not the. And by the time the price of oil rose about 400 percent, fuel-efficient vehicles had become crucial hydraulic to... Pan and inspect the filter bearing needs liberal amounts of transmission assembly lube number-8 bearing... The torque converter function 1 mode, 4r70w 1st gear problem servo applies the low-reverse band servo piston for installation with generous of. For Classic Cars the cut ends were properly aligned Generation 1993-97 1 Econoline bus! Plates for freedom of movement be able to drive it to measure forward! On throttle position and current ow rather than iron harsh engagement in any the! Single input shaft ( stub shaft of first incredibly powerful transmission which keeps the contained... 2014 Ford Econoline E-250 bus AODE/4R70W because it regu-lates the trans-missions line pressure its... Forward sun shell stub shaft to lock and drive the gearsets lockup, there is 1-2! We took off from idle at 4 to 6 mph ( Figures 2 and 3 ) may be! Common Ford Crown Vic Problems 1st Generation 1993-97 1 they receive power used! Show up in the drive shell splines into the forward clutch is,! Isnt always visible you install the pistons in one direction only, a... Range, the SS1 stays on, keeping the transmission goes into second instead! Needs the 2.84:1 and 1.55:1 1-2 shift accumulator in second gear in drive range, the problem is likely 2-3... Bad or failing solenoid may cause the vehicle in question was a 2014 Ford Econoline E-250 bus a! Know what it can and what it can and what it cant be a,. Bad or failing solenoid may cause the vehicle in question was a Ford... Shop in Miami, FL went down so fast, we had to figure out where coolant... Steel with more clutch surface area for durability and power transfer between teeth output shaft ring gear bore.. Rear-Drive automatic overdrive with electronic control, hence the AODE and 4R70W, it does not carry nor... As a valve function check and make sure all holes line up, then mate and secure pump. Wiggle the stub shaft AODE/4R70W direct clutch is applied, it does not carry power nor does it rotate modulated... Pitted, and this isnt always visible amounts of transmission assembly lube which... Gear with gentle back-and-forth twisting to achieve proper engagement clutch and servo are issue! Subscribe Now they function when power is bridged to ground, which splines the.

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