What rear end do I have?

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69bronzeT5

My wife's car is faster.
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I have a '73 Duster, 318 auto (on the column). What rear end should it have?
 
Can I still do decent burnouts with either one? And will it only be a 1 wheel burnout? haha
 
Does it still have the fender tag? If so look for the following codes.

D81 = 7 1/4 D82 = 8 1/4 D83 = 8 3/4
 
axle.jpg
 
If it is a 7 1/4 you will be able to do ONE burnout unless it is a true tracking posi grip then it will last for a while longer.
 
Rear axle codes aren't generally on the tag unless it's part of an "A" code accessory package on 69 up cars
 
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