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What rear end gear would I use to make 4th at 6400 RPM 125-130 MPH in a 02 C5Z

Well a 3.42 gear at 6500 is appox 150 mph.

a 3.73 at 6400 is approx 139

a 3.90 at 6400 approx 130

Quote:

Originally Posted by AU N EGL (Post 1560517786)

Well a 3.42 gear at 6500 is appox 150 mph.

a 3.73 at 6400 is approx 139

a 3.90 at 6400 approx 130

Thanks for the info in my post about rear end gear. Is there a online calculator somewhere that would calculated speeds in different rear end gears and different trans gears?

What I'm trying to decide is a rear end gear change for my home track of Thunderhill. The 3.43 is just too low. I'm coming out of thrn 11 in 3rd at RPMs as low as 3200. At the end of the straight I'm at about 122-4 MPH in 4th. I think a 3.90 would be about right for the top end but I'd like to see how the 3.90 would work coming out of the slower turns.
Dan

down shift to second