Drivetrain Encompasses driveline components such as the torque converter, clutch, transmission, shifter, front and center differentials, driveshaft, rear differential, and axles.

How to confirm rear diff ratio?

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Old 01-14-2012, 08:50 PM
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Car Info: 2002 Impreza 2.5 RS Midnight Black Pearl
How to confirm rear diff ratio?

So I picked up a read diff from an automatic 2002 WRX. Everything points to it having a 4.11 gear ratio, which matches my 2002 2.5RS rear dif ratio.

Being the paranoid one and just wanting to double check that the two have the same gear ratio, how would I go about doing so? I don't really want to take the WRX diff apart if I don't have to.

Anyone know how? Can I count gear teeth?
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Old 01-18-2012, 04:21 PM
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Car Info: 03 wrx
You can count gear teeth. # of Driven gear divided by #of drive gear teeth = gear ratio.
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