I'm new to this site due to one reason. But now that i've found it i plan on stickin around and learnin about what people are doing with their trucks these days. i've got on 04 4.8 1500 that i'm now having transmission problems.i've talked to the mechanic i've been going to for years and said i should rebuild it. but my main question is if i try to put a heavier duty transmission on it, will it give my engine problems? I've been doing alot of towing and just put some bigger tires on it with a small lift. only then did i start getting some of the problems. i'm thinking its from the tires but everyone else i've talked to that did the same thing hasn't said anything about it. anyway i hope someone can give me some good advice. ya'll take care now.