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I purchased my 03 SS in January of 15' and it has always shifted a little slow, it hasn't gotten much worse since I flushed it and added lucas tranny stop slip to it. But the 2nd to 3rd shift is still not very healthy. I'm wondering if anyone has rebuilt these transmissions? I thought about maybe putting a very mild shift kit in as well when I have it all apart. I need suggestions on what rebuild kit to purchase, and any advice to which shift kit to install, or if thats a bad idea. I do body work for a living, but I have a very skilled mechanic friend who will be helping who has rebuilt a few transmissions before.

This is my 2006 Silverado 1500 LT with the L33 5.3L Vortec, 4L60E trans, Volant CAI, and Cortex Superchips Tune. (on lift, not actual level.) Last year about this time my transmission bit the dust. my 2-4 split had seen better days. Although i know exactly why it went ;). Anyways I have had a need for speed and am wanting to make my silverado a pony pusher. I eventually want to get a cam but still havent decided. But i saw on summit racing some shift kits for my truck and didn't know what was good and what wasn't. And I also have looked at a stall York 3000, I think(it has been a while since i last looked). I was wondering if this is; A. nessicary, and; B worth the money.