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Message: <blockquote data-quote="Addermk2" data-source="post: 1491493" data-attributes="member: 8201">I found that with 3.73's I was on the limiter almost instantly. I had to set my shift parameters around 4800 in order to make a timely 1-2 shift before banging the chip at 6500. I stepped back to 3.08's because turbos like load. If you spin an engine too fast, you will lose load on the turbo, and in essence slow the car down because you're not making enough boost in the lower gears. I've been 147mph in the 1/4 with 3.08 gears. My new shortblock and cam will be complimented with 3.55 gears because Ill have more useable RPM range.Seriously, trust me. Don't gear the car until you have dyno numbers. You'll thank me later.Take the UDP's off and put your stock pullies back on. You're going to have problems with those.Honestly, I dont know why people still buy those things.You seem to forget that a typical 5.0 runs out of oomph at 5800-6200 rpm. That will give him MAYBE 110mph to play with at the top of 4th gear before he's banging on the limiter. I'd be willing to put money on the fact that he'll regret gearing the car that high.</blockquote>