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Old 06-14-2010, 10:22 AM   #1
84SierraClassic
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Join Date: Apr 2010
Location: Twin Cities, MN
Posts: 52
Gear ratio identification

Hey guys. I am trying to identify what my gear ratio is in my rear axle, without having to tear it apart. I have tried looking it up with the RPO code, but all I can find is GQ1=standard axle ratio. Now, looking at RPO codes for the past 2 days I have found that gear ratios have codes GT*, or GU*. Now, I only have 1 sticker with RPO codes on the vehicle, on the left inner fender. No sticker with RPO codes in the glove box. So I am at a bit of a stand-still.

cliff notes:1984 GMC SierraClassic 1500. All stock with the only exception being the motor. Only RPO code I have to go off of is GQ1. Rear diff is GM Corporate 10-bolt.

I will get tire size info, and what RPM at what speed once I get a tach installed. There is a way to find out what gear ratio is by some formula isn't there?
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2006 Ford Focus SE ZX3-89K 2.0L/MT 5spd -- Sold
1984 GMC Sierra Classic K1500 350/700r4/np208c(low gear 261) all stock otherwise(workhorse/pull truck) -- Sold
1974 Chevrolet Cheyenne K1500 366TD/SM465/np205 6" lift with 35s 1/2ton axles (project/mudder) -- Sold
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