[Fot] determining differential ratios

[Bill Babcock]

You can certainly do it by counting teeth--it's the number of teeth in  
the ring gear divided by the number on the pinion. You can count them  
in place by marking the driveshaft and the,  tire then have someone  
rotate the tire ten revolutions while you count the driveshaft  
revolutions. 41 driveshaft revolutions equals 4.11, 37 = 3.7, etc. You  
do it for ten revolutions because it's hard to see the difference  
between 3.7 revolutions and 3.9. You can do it for fewer tire revs but  
ten makes the math easy.

On Oct 19, 2008, at 1:59 PM, Bobby Whitehead wrote:

> I've been told I have a 4:11 differential in my possession.  How can  
> I determine which one it is? Do I count teeth on the pinion gear or  
> what?
>
> Not the sharpest pencil in the stack....
>
> Bobby Whitehead
> #53 CVAR Triumph GT6 EP Group2
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Bill Babcock
Babcock & Jenkins
Billb at bnj.com
503.936.7660
www.bnj.com

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