If the differential is an "open" diff - ie not welded or limited slip
here is the quick way to determine ratio. With rear wheels off the
ground, keep one wheel from turning (put your foot against it). Put a
mark on the driveshaft flange and on the other wheel. Turn the
driveshaft, counting the turns, until you have 1 turn of the free
wheel. Multiply the driveshaft turns by 2 and you have your ratio.
Example, just over 2 turns of the driveshaft is 4.1; 1 3/4 turns is a
3.45; just under 2 turns is 3.89, just over 1 1/2 turns is 3.27, etc.
Works every time - no counting, no disassembly. Ted
Bill Babcock wrote:
> 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
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> 503.936.7660
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>
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