Hello, I'm posting this for my pops. If you have any questions beyond what's mentioned here, I can put you in touch with him directly. The rear is in Red Hook, New York. 8 3/4 Rear drum to drum with posi (489 case). 390 gears 4.5 Inch Bolt Pattern 10 Inch Brakes Price: $800 Local pickup only 40.5" perch to perch (must have been modified for an "A" body) Fit fine in the duster it came from 56.5" flange to flange The rear was in a 1973 Duster (functioning fine) but we believe it originally came from an E body.