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Hi all, got a 1980 8 1/4 in the back of my truck with 2.94 gears (or around there) i have a NOS set of 1978 3.23 gears for a 8 1/4 laying around, just wondering how hard/time consuming is it to change? or is this something i should let a pro do? also will i even be able to notice a difference in...