1995 Duramax Conversion Jumping and surging

H1 (Hummer) & HMMWV Specific Information

1995 Duramax Conversion Jumping and surging

Postby Hurt » Fri Sep 18, 2015 10:32 pm

Hello I am new to the form, I am having an issue with my 1995 it was rebuilt in 2008 by Predator and has duramax Alison transmission and 261 transfer case. It just started not shifting into HL or L and jumps and surges when you start it. Feels like its stuck in LL almost like it want to dig a hole. I took it to the best transmission shop i could find inDallas and they cannot diagnose the problem they tell me it could be TCM or ECM or transfer case. Has anyone had a problem like this can you help me diagnose the problem.
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Re: 1995 Duramax Conversion Jumping and surging

Postby poway14 » Tue Oct 20, 2015 10:52 am

Have you called Predator? Might be worth a shot.
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Re: 1995 Duramax Conversion Jumping and surging

Postby Ian Ward » Thu Nov 12, 2015 9:09 pm

I could help you troubleshoot it over the phone. I live in Austin and service hummers in central Texas. I will need to ask you a list of questions. Does it roll downhill and park? If so the park pin is broken inside the transmission will move when trying to start. I have a Duramax conversion in my garage right now to compare to that was fortunately not done by predator. Call email or text

Ian Ward
Rollin Road Service
281.802.1131
Iandanielward@yahoo.com
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