What size Rear?

[flowjoe]

Originally Posted by KevinsZ28

3.73's work great!
I have 4.10's but my dad has the 3.73's in his chevelle and he can do about 70-75@2,800rpm. I kind of regret the 4.10's for highway use, only cause on highway 3,000rpm im at 50-55mph!!

Your Dad's Chevelle must have very tall tires or an OD unit.

With a final drive ratio of 1:1, 3.73:1 rear gears and a 33" tire one would hit 2848 RPMs. On a more "traditional" 26" tire with the same gearing as above one would see 3615 RPM's

Check it out here: http://www.csgnetwork.com/multirpmcalc.html

My nephew had a very wild 427 BBC and 3.73's in a '69 Camaro....That car would have been brutal on the highway if it weren't for the Tremec 5 speed...we were well under 3K RPM at ~70 MPH