Don't do it. No really big changes until the 25s. The 5.3 is a dog vs the 6.2 in a full size, and the lifters can go out on either one. Get the diesel if you want better reliability and MPG...
Sorry, didn't see that since you followed up with the front dif question. The TC takes more of the abuse in your dubious drive mode choice; 140k in auto sounds like a pretty good run for it. I second getting it up on a lift...
Just to clarify, the Hellwigs were instantly noticeably better while the Hotchkis kinda feel better. I know its almost double the price, but I wont buy Hotchkis again...
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