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I never completely pinpointed the problem. It was the converter locking in reverse. After a I did a full valve body disassembly and found nothing there I spent a few hours talking to different Allison techs. The final determination was that there was more than likely a crack in the pump area...

Well at this point I am going to move the truck to a location that I can pull the cab and yank the motor/ transmission out. I found a lead on a rebuilt trans, so I guess this will motivate to do my swap and get this truck all painted up nice.

Thanks that would be great if you could ask your buddy. The only extra info since the first post is that I did pull the pan to inspect the converter lock up portion of the valve body and it is operating perfect. I had one deale tell me that I could be having a leak from forward clutch lock up...

Are you talking about the front wheel drive lock switch? Thanks Ryan

Well I have pulled and inspected the lock up cup off valve and all looks good there. Now I am at another stopping point not knowing where to proceed to. I am learning that Allison dealers really don't want to talk to customers. I have calls into 3 different dealers and Oshkosh directly with no...

I will have to go check that out later. I drained the trans last night and I'm planning on pulling the pan and valve body tomorrow. Thanks Ryan

No Ideas???

I have a Allison ht 740 behind a Detroit 8v92 in a mk48 that I an having problems with. When I put the truck in forwards the converter locks and stalls the truck. When put in reverse the converter is unlocked and operates normally. I have bypassed the external lock up selinoid and checked to...