I had a 05 ccsb 2wd lifted with some 35's. After the lift I went from 3.73-4.56's, and an aburn locker... made a HUGE difference. Shortly after I put some LT's, cai, shift kit and servos. Thing would actually run pretty good on those big tires. But the tranny went out pretty quik with the shift kit. Had it shifting wwwaaayyy too hard, it would leave 2-5ft black lines if it hit 2nd at WOT on any pavement. Even driving it that hard I never had any problems with the rearend. So I think if you beef the rearend up with a good locker then go with the 4.56's unless your serious about not staying n/a. Might be alot of fun on the street but the highway would be a different story. 4.10's-4.56's seems like a big jump to me. I think motive makes some 4.30's, that may be your best bet. Good luck bud
-Chris


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