GMC Truck Forum banner

Discussions Showcase Albums Media Media Comments Tags Marketplace

1-3 of 3 Results
  1. Engine & Performance
    Hello, just wondering on your guys opinions on a gen 4 swap so i can use a 6l80 or just try to swap a 6l80 in on an 03 sierra, I'm sick and tired of having a 4l60 and I refuse to use a 4l80 because of the rather sickening gearing. I know there's that 6l80 harness from zero gravity performance...
  2. General GM Discussions
    I just purchased a 6.0 that came off a 2007 Silverado 2500 HD. I have a 4l80e transmission and have been told that it won't fit the 6.0 and I've also been told that it will fit. Those who say it won't fit tell me it's because of the plug from the harness to the transmission. Thoughts on this...
  3. General GM Discussions
    Ive recently swapped a 5.3 into my 03 Sierra base model single cab (was a factory 4.3) and I got a wiring harness out of a 02 suburban. My problem is that when I go to turn the key to accessory power it starts cranking the engine over, it does this in all key positions. Ive replaced the starter...
1-3 of 3 Results