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You can call a GM dealer and give them the VIN# and tell him what you want to know and he'll tell you. Are look at the tag on the rear end plate if its still there and it will tell you. IF you want to know for sure, Then here's what you do.

Remove the rear end plate and count the teeth on the big gear ( RING GEAR )

Then count the teeth on the small gear ( PINION GEAR ) up inside of housing

And it runs in the ring gear. Then devide small # into big # And that is your gear ratio

FOR SURE.

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Q: How do you know the diff ratio on a Chevy silvarado 4x4?
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