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  1. 04.5-05 LLY Duramax Powertrain
    So this started back about 6 months ago but my truck has been doing the rough idle thing when it reaches ~160 degrees. I had a mechanic shop tell me it's my lift pump but I don't think that's true because it was also doing this before I installed the lift pump. I had a buddy tell me it sounds...
  2. Transmission Shop
    Hey all, I've got a 2003 LB7 Duramax with 240,000 miles and a Bully Dog tuner throwing p0700 and u2106. I know the p0700 is a MIL request from the TCM and the u2106 is lost communication with the TCM but I don't want to sink money into a new TCM if there's a cheaper fix. The truck shifts hard...
  3. Transmission Shop
    Hey guys. I have a 2003 GMC Sierra 2500HD 4x4. 8.1L gasser with the Allison 1000, 198k Stock TCM tune, when accelerating, hard or easy, from a dead stop and going through all the gears it shifts perfect. If I downshift only one gear while going 55mph it shifts fine, if I hard accelerate at 55mph...
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