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Alright I've decided at this point if I'm going to work on my truck I'm gonna play with it a little. She's a 2003 Silverado z71 LT EXT cab 5.3 Vortec. I've got some questions on Thai project I'm preparing to dive into. The reared what is it exactly, how can I find out. And depending one which one what's the max power I can apply to it. And what would be a good replacement. The transmission would be the same question what's the safe limits. I rebuilt the transmission a couple years back and upgraded the rings and cylinders to hold more power and a harder locking shift. The engine I'm planning on getting a a set of aftermarket heads, manifolds, camshaft, high pressure injectors high pressure fuel pump aftermarket intake manifold larger throttle body. I'm trying not to go to over the top because I still use the truck daily just want a little more fun out of it. Right now there's a custom exhaust system under her but I'll probably end up replacing it. Planning on tearing through the 5.3 for a rebuild haven't decided on a bore, strike yet or if I will. If so what's the safest bore on the 5.3. All in all wrap it up with a tune job and probably aftermarket tuner, and a stall converter. Any add ins from project guys or gear heads would be great or what I need to beef up in order to hold that I haven't mention. Until I start to work on the body and such since she was used as a daily driver for years she will look a little rough, just want to get her back up to, and beyond, how she used to run. Right now she has 250k miles on her having some troubles with a cylinder missfire and instead of waiting for more issues to come in her older age I've decided to get ahead of them and bring her back. Thanks guys