Originally Posted by Posey
We just brought home a 1998 1500 Sport with no reverse and a crazy shake in overdrive. The guy who had it before was a four wheeler. If you don't mind, could you walk me through how to check the reverse piston and the reverse band adjustment? And what do you think might cause the shake in overdrive? Thanks a ton!
Sure not a problem. Well to check the reverse servo you're going to need a supply of compressed air and a small air blower.
Parking brake on, wheels chocked, transmission in neutral.
Start out by removing the valve body, in order to do this you will have to remove the shift linkage, throttle linkage, then the linkage levers, then remove the neutral safety switch, disconnect any electronic connectors leading to the transmission except for the speed sensor of course.
Then place a large catch pan under the transmission oil pan, remove the bolts and let the fluid drain into the catch pan. Be sure to not contaminate the fluid if you plan on re-using it (if fluid is dirty and not red then replace fluid).
Ok with fluid out, remove the filter then remove the valve body by removing the bolts around the edge of the valve body there should be about 8 or so 1/4" bolts so use a 1/2" socket.
When removing the valve body use a soft mallet and hammer down on the OD/TCC connector because if you don't you may snap the connector when you pull the valve body out.
Also pay attention to the parking rod, you can disconnect the parking rod from the valve body by removing the e-clip or you can remove the valve body with the rod attached, I prefer to disconnect the rod from the valve body because it's a pain to put the rod back into the transmission.
Once the valve body is out set the pressure regulator gauge on your air tank to 15 PSI, this is all you will need to test the servo.
I will attach a file to show you where the test port is. You want to apply the air pressure to test port number 2 on the PDF I supplied you. The servo should protrude and compress the rear band.
If it works then the servo isn't leaking, if it doesn't work then it's leaking or is stuck.
OK That over with...
Now to adjust the rear band, just unscrew the locking nut but don't remove it. Then torque the adjuster, it should be a torx screw or a square end adjuster, you want to torque that to 72 inch lbs then back off 2 turns and then while holding the adjuster screw the locknut then torque the locknut to 25 ft-lbs.
Some things that will cause a no reverse are a broken Overdrive Direct Clutch (would cause your 4th gear vibration), a malfunction in the valve body (not likely in this situation), a burned out front clutch however you wouldn't have 3rd or 4th gear.
Any other questions just ask.