Check Ford trucks and International for rotted tone wheel which is part of brake rotors. This is due to driveline angle and or torsional vibration due to out of balance drive shafts and driveline problems. Now gently pry the lock up. Cause: The rear transfer case output shaft bushing is completely wiped out, this can cause the output speed sensor which is located in tail housing of transfer case instead of rear of transmission to grind into the speed reluctor wheel and causing harsh downshifts. Lube oil is not draining back into sump quickly enough causing pressure build up and venting. If you take valve body apart you may or may not actually find valve stuck, very sensitive, timing of stroke can create codes, this is extremely common issue. It can be a real joyous occasion here! If for some reason the transmission is not in neutral, use a wrench on the selector shaft flats and rotates the shaft to its furthest clockwise position and then rotates counter-clockwise two detents.
Allison transmissions are best identified with serial number and part number on tag which is located on right rear passengers side of transmission. Second issue can be erratic speed sensor signals which you will likely only find by graphing the sensor signals. Cause: Debris has stuck shift valve E in valve body. Wiggle as you pry helps removal. There'll be some resistance when you pull it off. Take a file and touch up the selector shaft at the end near the flats.
May also have trouble codes P0776, P0746 in memory. Locate the retainer blue and pull it out. Obviously you can have spun pump bushing causing a leak etc. This process is the same for all 2001-2005 5-Speed trucks. The last guys got the laugh! This one has one connector. . You may also encounter an Allison tag that's stamped wrong as well! Remove the nut from the end of the selector shaft.
Location: The switch is located on driver's side of the Allison transmission. Cause: One big problem here is the bolt pads on the torque converter crack and cause leaks, this can happen with reman converter and we strongly reccomend you only install Reman torque converters with an upgraded billet front cover to avoid this comeback after rebuild or replacement of the torque converter. Beware if changing one unit from truck to truck and so on. Alot of times were seeing that the bushing is completly gone and the drive shaft yoke is grinding into the tail housing itself. Cause: Heat has melted the sealant between the plug and switch, you can usually safely remove the plugs if stuck by warming them up with Bic lighter or similar low heat source. Put the transmission in neutral.
Disclaimer - Some information in this video may be incorrect or not manufacturer recommended. However if you have pre 2006 Transmissions the recommended fluid before then was dexron 3 and equivalents We offer Free transmission diagnostic help for Allison transmissions via E-Mail:. This can happen in any Allison transmission, you can also drill small hole in top of fill tube by stick handle end,. They no longer recommend the use of Dexron fluids in any transmissions. Make sure you block the wheels and set the parking brake. I am not responsible for any problems or damage you encounter. Match the information from both! With a wrench hold the shifter from rotating out of neutral.
While this process varies for 2005-present 6-Speed trucks. On rare occasions this can also be due to engine miss fires due to injector problems, may or may not be noticeable or have trouble codes. Again use an adjustable wrench on the shift lever while tightening the nut on the end of the selector shaft. Watch and follow this video at your own risk. The metal clip neutral assurance bracket on the switch helps to ensure the switch is properly aligned to the shaft. Cause: You may automatically think this means solenoid A or B are bad? Carefully remove the selector lever from the selector shaft. .
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