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Old 08-02-2012, 06:28 PM
matt167 matt167 is offline
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'91 4x4 with F44 RPO has upgraded HD suspension/ brakes ( N/A to a '73-'87 ) and a Semi Floater 9.5" 14 bolt.. If you have 8 lugs on the '91, it's a 2500. plain and simple. You could swap the entire rear end over to the '79, but as far as swapping the gears, the '79 has a 28 spline 10 bolt, and any variation of the '91 truck you describe will have ither a 9.5" semi floater 14 bolt or a 10.5" full floater 14 bolt, so stuff just won't swap.

I didn't mention front stuff because it won't swap
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