i'm currently running 33's and just swapped from 3.55LS to 4.56LS and the difference is night and day. acceleration is amazing and city milage i gain 1-2 mpg as i'm not having to put my foot in it as much, hwy (65-70) stayed the same, but anything over that speed it drops off. check ebay for the parts, i got mine from AZRACEPLACE for 215 shipped (2wd), they have 4wd sets for around 450. labor to install at my local shop was only 375 and took 2-3 hours
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