how do i find out what gear ratio i have in my diff.? [Archive]

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eriks98s10

10-03-2005, 11:15 AM

i heard something like marking the driveshft with white-out or something and then spin the tire (x) amount of times and count how many times the driveshaft turned, and that will tell you the ratio :confused: ... can someone clear this up for me? maybe someone knows what comes in it already? its a 98 s10 LS, 2.2, auto trny, reg cab.

thanks,
erik

eriks98s10

10-03-2005, 11:17 AM

I'd probably have to have the stock tire diameter, too, right? my tires right now are a lil smaller than stock...

alscrimp

10-03-2005, 01:41 PM

Jack up the rear of the vehicle and go get a friend to hold one of the wheels. Put the trans in neutral and mark the other wheel. Then turn the other wheel 2 complete turns while counting the revolutions of the driveshaft. Chances are with a four cylinder you should have a 3.73:1 ratio.

Old Man

10-03-2005, 04:54 PM

Look in the glove box for the GU code. GU-4 is 3.08, GU-6 is 3.42 and I forget the others right now!

eriks98s10

10-03-2005, 05:39 PM

ok thanks guys, i have the 3.73....