7/16 x 20 for bolts and nuts. The main thing is the size of the knurl of the bolt where it goes into the axle. You'll need to know what the rearend was originally out of.
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1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear
85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book.
87 F350 6.9 4 speed dually
A poor man has poor ways.
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