The rear tread width of your '63 is 58". I used a 12 bolt from a '65 Chevelle under my '63 LeMans. I believe that All of the GM A-bodies were the same between '64 & '66, then in '67 the width was increased one inch to 59".
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Bill
64 GTO, tube chassis w/606" IA tall deck, PG & a pro geared Fab 9". 2750 lbs.
[email protected]/4, [email protected]/8, 1.1981-60-ft. 8/10/08
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