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Old 07-15-2013, 08:34 PM   #1
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Posi rear end

Found a good deal on a gear 7.5 3.45 posi rear end. Should I change out the original limited slip out of my 1990 gt?
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Old 07-15-2013, 08:36 PM   #2
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No, you have an 8.8 out there stock. If anything, upgrade the diff you have to a 31 spline unit with matching axles.
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Old 07-15-2013, 10:21 PM   #3
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Can I get get a locking gear for it
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Old 07-16-2013, 06:45 AM   #4
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Scotty is right, the 7.5 won't last. You can get almost anything for your 8.8. You can even rebuild them and make them very tight where you still keep the limited slip for better street characteristics.
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Old 07-16-2013, 08:43 AM   #5
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You can get ANYTHING for a 8.8 rearend, going to a 7.5 is like going from a V8 to a V6... Honestly a stock replacement rearend with the clutch upgrade (google it) will hold up very well to as much power as the block can handle. Unless you are going to be doing a bunch of hard launching on slicks I'd just go that route.
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Old 07-16-2013, 05:45 PM   #6
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Agreed! Driving a daily driver with a true posi unit would be horrendous!
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