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Old 05-12-2003, 08:11 AM   #1
gmc7286chevy
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rear end gear ratio

I have an 86 chevy 1/2 ton 2wd with a 305, 350c trans and a 10 bolt rear end. I know somebody here knows what ratio this setup came with.
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Old 05-12-2003, 08:12 AM   #2
gldevall
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Check the tag on the inside of the glove box door. It should be listed there.
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Old 05-12-2003, 10:51 PM   #3
MylilBowTie
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There are lots of 10bolts with 2.73 / 3.07s. If you had a factory 6 cylinder or towing package you will more likely have better gears. Numerically higher like a 3.23 / 3.42 / 3.73.

Best way to find out is to pull the cover and count the ring and pinion. Im sure the differential could use an oil change anyway. You will get a chance to see the gears and how the ware looks on them. You will need 2.5 quarts of gear oil, a cover gasket, and a 3/8s drive ratchet to remove the fill plug on the passenger side by the driveshaft. I think the bolts are 1/2 or 9/16. Its really easy.

The RPO list should be in the glove compartment or in one of the fender wells (inner fender) sides.
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Last edited by MylilBowTie; 05-12-2003 at 10:54 PM.
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Old 05-13-2003, 12:00 AM   #4
gmc7286chevy
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Thank you,
Thank you very much!
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