I'm looking to swap my stall in my 6speed, I'm new to this so any info would be helpful. I have bigger tires now and it lugs worse than before. I want to stay away from internal engine mods and gears since my truck is still deep in the warranty and don't want to void it. Dealership said a new converter wouldn't affect my warranty if it was done for "towing use" from a cert. shop or at a GM dealership.
08' GMC 2500HD 4wd