I Might Just Know What I'm Talking About
Join Date: Apr 2001
Location: Ocala, FL
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Re: 5.3L Turbos
The 5.3L is a good engine, they do have a aluminum block version in the Silverados, 310hp and like 335lbs torque. Its what they had in the SSR and Trailblazer EXT. But I belive they use the LS2 in those now.
How many miles is on it? If its got alot, I'd just go ahead and get a 6.0... The 4.8, 5.3 and 6.0 are all the same block.
Next, I think your problem is gears, what gear ratio is your axles? IT sounds like you need 4.56 gears. But I bet your running stock 3.42s or 3.73's.