Technical Tips > Transmissions - Differentials

diff ratio, not happy

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gtc:
Have you made allowance for those big wheels in your speedo gearing?

If you want to play around with various diff ratios, put your data into this. Like most of these calculators it uses mph, but your '68 would have a mph speedo unless you have changed it. These calculators are not super accurate, but they are close enough to be useful for diff comparisons at highway speeds.

http://www.f-body.org/gears/

I'm guessing you have a Muncie M20 wide ratio box (most commonly installed), in which case the ratios are:

1st  2.52
2nd  1.88
3rd  1.46
4th  1.00

87droptop:
no, didnt allow for the wheels, even though they r big, didnt make much difference to the final ratio, not drivable around like this... i think it is a muncie gearbox mate,so the final gear is 1:1 u r saying, then a 3.08 or 3.36 might do for diff gears...

87droptop:
this calculator is great mate, thanks, i thimk 3.08 is gonna be it...

sirfixalot:
I have a set of 3.55 gears that have been lapped by diff technics & are ready to go into diff you can have for $200

87droptop:
3.55 is a bit too high mate, thanks 4 that anyway..

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