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need help

  1. Transmission Shop
    Hey there! First time posting but really need some help. 3 days ago I changed my tranny fluid, did lots of small driving and stuff around town, yesterday had to leave town for work and got 30min outside my home town and truck shifted hard into 4th no other gears. Well, obviously limp mode but I...
  2. General Discussion
    Hello, I have a 2003 GMC Sierra Lb7 and I am having multiple intermittent electrical issues, my windows won’t go up and down, my nothing works in my gauge cluster except speedometer and tachometer, my ac doesn’t work, ABS, Brake light, and battery lights come on, my power locks won’t work...
  3. Drivetrain
    I have a 2007.5 GMC Serria 2500HD LMM with the 6-speed Allison Transmission 4 wheel drive, the other day I went and picked up a mini excavator and was towing it home when I noticed something iv never noticed before. I stopped at a red light in town and when the light turned green I let off the...
  4. Towing & Hauling
    I’ve got a 2010 duramax and every time I start my truck it says service trailer break system. But when I hook my trailer up and start my truck with my foot on the break it comes across the dash saying “trailer connected” and the trailer breaks work fine until I take my foot all the way off the...
  5. Performance Upgrades
    Need help from real pro's here. I purchased a Banks Ram Air and Super Scoop for my 04 lly about a year ago. Since purchasing the ram air system from Banks, I've read a lot of threads that the K&N filters are not good filters for a diesel and the filtration is poor. The air filter that Banks...
  6. 01-04.5 LB7 Duramax Powertrain
    I am new to the diesel side of things and I got an 03 duramax about 6 months ago. It started to blow white smoke after working hard towing my dune buggy around. I brought it in to the dealer and they said that cyl. 7 injector has a high balance rate and needed to be replaced. I decided to just...
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