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Re: Rear end gear options with stock axle
If this is your '62 GMC, and if it has the Eaton HO32, then there is only one other gear available for those. They are aftermarket 3.38 gears, and are a bit spendy when you can find them. If your truck has the Dana 44, then there are quite a few options, but none higher than 3.54 that I am aware of. Otherwise you will have to change to a different differential. Also, changing to a very high rear gear doesn't always mean better mpg's. IMO, 2.73 gears with a 3 speed won't be a very good combo, other than on the highway.
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