I suggest you change to a 8.5 10 bolt from the Grand Nationals it will last behind a 455 the 7.5 will not last it will be just throwing money away "my oppinion". I have a 82 Grand Prix with a 455 and I switched to a 9" Ford from Moser with 31 spline axles. No Problems! The other thing with the 7.5 they have small axles. If you are looking to buy a Grand National Rear end give me a call I have a line on one.
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Fast 82
G & G Perfromance Parts
(937)307-6586
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