Lizard928

I am looking for the final ratio of the first 4 speed autos, and what year exactly the 4 speed came standard.

TIA

Vilhuer

4sp came in '83 MY for US and Canada, '84 MY for all the rest.

Jim bailey - 928 International

the early 3 speed 22.01 , 22.02 , 22.04 used a 12/33 ring and pinion for a ratio of 2.75 to one driven by a 2.306 first gear or a 6.34 to the axle ...The USA 1983 4 speed used a 15/33 ring and pinion for a ratio of 2.20 BUT BIG BUT the 4 speed first gear is a 3.676 for a ratio to the axle of ........... 8.0872 !! The better to spin tires with !

PorKen

So, uh, that there 4-speed is like havin' a 20% overdrive with the 2.20, versus the 2.75?

rixter

IIRC all US spec autos from 83-88 had a 2.20 final drive, correct?

Lizard928

Thank you fellows,
that is what I thought it was, just wanted to confirm and dont have my manuals handy as I am outta town.

FlyingDog

http://members.rennlist.com/flyingdo...calculator.xls <-updated