With Tremec TKO600, what would be the best rear gear to have?

firstgear · 12-12-05, 08:48 PM

Looking at replacing the rear end on the '60 while I am at it....need some advice as to what a good rear gear ratio to have would be....want to be quick, but in 5th gear would like to be economical...ideas?

12-13-05, 01:07 AM

Anywhere from 3.36 to 3.73 woul dbe a good range to give you want you want. I have 4.10 in my Camaro with TKO600, 3.36's in my Corvette with TKO600 - both work fine but I think the best bet is 3.55's.
Try our calculator to check out any scenario you want:
http://www.classicchevy5speed.com/RPM_calculator.swf.
Here is some other info that maybe of interest to you:
http://www.classicchevy5speed.com/63_67_corvette_transmission_install_notes.htm.
http://www.classicchevy5speed.com/in...n_corvette.htm.

I hope this helps.

Jeff Mortenson
Classic Chevy 5-Speed
jeff@classicchevy5speed.com
760-230-2045

Rowdy1 · 12-13-05, 05:58 AM

How quick do you want it to be 1st thru 3rd? 4th is 1-1 and 5th the OD, do you have engine work, lots of variables but lots of choices also. I had a 4.10 with the 4 speed and went to a 3.90 with the TKO 600 from Classic Chevy 5 Speed and for what I wanted it's fine. Do your homework, use the calculator Jeff gave you on his site and it should help you decide.

firstgear · 12-13-05, 06:46 AM

thanks all.....I have a 383 stroker (350 stroked, cast iron heads, mild cam, holley 750).....

BarryK · 12-13-05, 06:57 AM

Herb
strokers typically has plenty of torque so you should be good for low-end grunt power, especially with a 5-speed. If it was me, i'd be considering a 3.08 or a 3.36 rear gear.
With your stroker motor and a 5-sp you should still have a lot of low end torque for "off the line" fun and the higher rear gearing (lower numerically) will make highway driving much more pleasant and help on some fuel economy.