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Check to see what the ratio is first. Jack up the rear end, put it in neutral.
Make a chalk mark on the drive shaft and one on the inside of the tire. See how many turns of the drive shaft it takes to get the tire to go around one time. The number of turns will be your ratio. I'd guess that you probably have a 3.73 ratio. If it takes roughly 3 3/4 turns, it will be 3.73 : 1.
If the rear is also a posi, it might be worth some bucks. Even more if its a 12 bolt. A stock ratio 3.08 rear should be available somewhere and would cure your gas mileage problem.
Bob
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