[Fot] determining differential ratios

[Ted Schumacher]

Bobby, tried to reply last night and not sure if reply got through.  
Here we go again. Apologies for sending twice if it did get through.  
This will only work for "open", not welded or limited slip, 
differential. Put a mark on the pinion (drive shaft) flange and  a mark 
on one wheel (or tire or brake drum).  Keep the other wheel, tire, 
etc.from turning. Turn the drive shaft and count the number of turns of 
the pinion flange needed to get 1 revolution of the tire.  Multiply this 
by 2 and you have the ratio. Example - just over 2 turns is a 4.1, just 
under 4 turns is a 3.9, 1 3/4 turns is a 3.5, etc. All you have to do is 
know what ratios were available.  The example of 1 3/4 turns as a 3.5 is 
not quite correct. Triumph did not make a 3.5, but they did make a 
3.45.  That's one method - no tools, no fuss, no dismantling. Ted

Bobby Whitehead wrote:
> Forgot to mention... I have several differentials laying around. I don't have them in the car. I have known and determined I have a 3:89 locked in the GT6. If I indeed DO have a 4:11 I need to understand how to figure it out without being in the car.
>
> Thanks guys....
>
> Bobby Whitehead
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-- 
Ted Schumacher
tedtsimx at bright.net
http://www.tsimportedautomotive.com
108 S. Jefferson St.
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