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  1. Transmission Shop
    I purchased a 05 gmc sierra 2500hd with a 5 position tuner and a built tranny to 750hp and shortly after getting it I started to have it go into limp mode when shifting into 4th. It always has seemed like I had to let off the gas a bit to get it to shift fully into 4th or it limped. When the...
  2. General Discussion
    I have a question about what fluid I'm suppossed to use in mike l 5 speed trans. I misplaced the receipt but just found it and it's a little hard to read the hand writing(sorry mike) it looks like dexron/mercon. But I'm unsure of if it's suppossed to be dex 3 or dex 6?
  3. Duramaxforum.com News
    Needing help. All gears forward good. But R blinks and only low rpm . If keep rpm up runs fine .
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