If your axles where made to fit into the A body rear end housing and to use the stock type brakes with the big bolt pattern you should be good, if they where made to use with the B body brakes and backing plates use them
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Years ago I went through this with Strange Engr., I had them make me a set of 35 spline axles to fit the stock A body housing with the stock brakes(there lighter than the other brakes on the E and B body cars
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They used the B body axle blanks that have a larger outside diameter on the axle flanges so the stock A body 10x1 3/4 wide brake drums wouldn't it over those axles until I had the axle O.D. cut down to fit into the stock A body rear stock drums, $75.00 later
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My message is you can make many things fit, as long as your willing to have them modified
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My car ran in the low tens and high nines at or faster than 126 MPH with those rear brakes and the 1973 and later single caliper A body front discs
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I never had a problem stopping that car at the races or anywhere else
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