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gm used the famous 10 bolt normally a 7.5 ring sometimes a 7-5/8 ring as for gear ratios either pull the cover on the ring you'll see a gm number or count the teet on both the large gear (ring) and the very front gear (pinion) and two numbers like 41 - 17 devide the larger by the smaller and you'll have the ratio or get the rpo codes out of the glove box. "GU4" is 3.08, "GU6" is 3.42, "Gt4" is 3.73, "GT8" is 4.10

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19y ago

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