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Old 10-25-2007, 05:23 PM   #1
Scooby Newbie
Member#: 130985
Join Date: Nov 2006
Default rear diff ratio

How do I tell which ratio my rear diff has? Reason I am asking is that I am changing the diff this weakend and I am not sure if my parts car has the same one. One car is a 97, auto trans, 14 inch wheels and the other car is a 95, auto trans, 15 inch wheels. Does anyone think there should be any difference?
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Old 10-25-2007, 09:24 PM   #2
Scooby Guru
Member#: 4021
Join Date: Feb 2001
Chapter/Region: NESIC
Location: Natick, MA USA
1999 Legacy GT Ltd
Quick Silver Metallic


Not sure.

Are these the same model Legacys ? I think your best bet is to try rotating the differential input (drive shaft) and get a rough appoximate guesstimate of how far one input rotation on the drive shaft causes the rear axle (output) to rotate, and compare the figure for each.

The only real fool proof way is to take the diff apart and count the number of gear teeth, and compute the ratio from there.

Also checking out http://www.cars101.com might give you some insites.

I know, for sure that the 2.2 litre automatics and the 2.5 litre automatics used different final drive ratios, and the 2.5 was not available in 1995, but was in 1997. So there is a distinct possibility that these two rear diffs have different final drive ratios.

Also I am sure you already know this, but its worth mentioning that being an AWD vehicle you need to use the same ratio to assure that the transmission/transaxle final drive ratios for the front wheels is compatable with the rear differentials ratio.

Either that, or just plug in the FWD enable fuse.
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