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I think they are the same widths. In 71 they got wider.
 

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i put a 9 inch in my 68 out of a 69 cougar and it was the same as the 8 that came out
 

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Only differnce may be in the drain plug for the pumpkin. Seems to be located in different locations between models.

There were a few 67's with 31 spline axles. I got one from a former Cobra Jet powered car (hulk). The gears in the pumpkin seem to klobber things in a standard axle housing. If you stick with any one the numerous 28 spline axle versions it will fit w/o modification.

Wm.
 
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