Roger,
There are a couple of different methods to determine your rear ratio.
If you just need a general idea of the ratio, you can block one tire and
jack the other tire up. Place a chalk mark on the tire ad rotate it 360
degrees while counting the rotations of the pinion. You shoud get
somewhere in the range of 2.5 to 5 turns. If the pinion turns 4 times
you would have a 4-1 gear ratio, a little over 4, may 4.10 - 1 ratio,
etc.
For a more precise number you can remove the reare cover and divide the
teeth on the pinion into the teeth on the ring gear. example...11 teeth
on the pinion, 44 on the ring gear and you are at the 4-1 ratio again.
This will work in finding out any ratio.
good luck
shawn
51 chevy 1 ton panel
ROGER GLEASON wrote:
>
> I saw a thread a while back about how to determine rear gear ratios
> without having to pull off the cover...Is there a way.? I looked
> thru the archives but could not find the article...When I spin the
> pinion one complete 360* revolution the axle turns 4/5ths of one
> revolution.
> If I pull the cover i could count the teeth on both the ring and the
> pinion then what?
> If I divide the ring by the pinion i am gonna get 1.08? something...
> if I divide the pinion by the ring i will get .08? something.
> DUH ! I can't believe I forgot how to do this...
> I can't believe I can spin the pinion one turn and get 4/5 of a turn
> from the axle shaft.
> Rogerg
> 51-3100 AD Stocker
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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