After replacing the clutch packs the problem cleared up and it appeared that there was some overheating there. Thanks for all the advice guys, it was all essential to correct the problem.
Clutch packs will weld, once that happens you will only have one direction of travel. You can check presures but your looking at rebuilding the transmission. The cause could be in the control inching side or just improper inching adjustment or operation.
The clutch disc in the reverse clutch pack have probably been overheated and are distorted taking up all the required clearance for lubrication. I really don't think your problem is in the control valve.
Let us know what you find when you disassemble the transmission
Good Luck!
I agree, that will be a good starting point and I feel that it's in the valve and that there is some oil bypassing causing this problem. Thanks for your help and posts.
Where the inching valve is doing its job I would assume that the problem is with the control valve. Good luck.
Roger
Yeah, thats what I was thinking, When the truck is in nuetral and it begins to travel in reverse, I can engage the inching pedal and at that time it disengages the trans like it was in gear. Now with that said it does not take off fast in reverse when in nuetral its very suttle, it will move a little then stop, then when you rev the motor again it moves a little more. It appears that the oil is bypassing a little causing the reverse effect. I will take the top cover off to ensure there is no bypassing or clogged ports. Thanks for your post Roger. Brad
It sounds like ther may be someting clogging up the ports. What does the truck do when using the inching system and reving the engine? It is strange that the oil was fine. I would remove the control cover and check it out.
Roger