Can you figure out the ring & pinion gear ratio without peeking?

[Metal Twister]

I know that with a standard Diff you can get pretty close to figuring out your gear ratio (ring and pinion) by turning the rear tire and counting the revolutions of the drive shaft. I cant think of anyway to check your gearing on a trans axle without opening it up and looking? Am I right or is there a way to know without all that hassle?
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[Bashr52]

I'd just pull the number off the side of the case and have a look at what it should be. You may be able to turn a tire and count the input shaft revolutions and see if that gear ratio matched up to what you counted?

[vwwestyman]

I'd say if both the R/P ratio and the individual gear ratios are unknown, then turn a wheel and count the shaft revolutions as mentioned, and compare what you find with a chart of overall ratios. With that, you should come up with a real close educated guess of what is in there.
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Dave Cook

President, Wild Westerner Club

1978 Champagne Edition Westy, repowered to '97 Jetta TDI
1973 Wild Westerner
My Thing

[Metal Twister]

Got it... The tranny is the running car with the engine. Guess at this time it really doesn't matter, just curious. Im 99% sure it is not stock as it has been reworked so I wouldn't trust what it should be by the identification numbers. Thanks for the help guys.
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[vwwestyman]

Even if it was reworked, I think it is very rare to change the 1st or 2nd gears. So maybe do your experiment with 1 and 2 and compare that to the gearing chart for your guesstimate.
_________________
Dave Cook

President, Wild Westerner Club

1978 Champagne Edition Westy, repowered to '97 Jetta TDI
1973 Wild Westerner
My Thing