Re: What donor axle for my 64?
Those are some really tall gears....you must be after either top speed or mpg. The tallest gears I know of in a truck rear are 2.73's, and those were in the mid to late 80's. The truck rear ends from '71-'87 will work for you, but they are 1.5" (~63.5") wider than the one you have now. I think the spring perches will need to be moved also.
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