Where can I find dimensions on factory 12bolt rear ends? I want to find one that is the right width and fabricate third gen mounts on it. Any info is appreciated.

 

First gen f-bodys are about the right size. Swapping over the mounts from a 10 bolt to any other diff isn't hard but you need some way to attach the torque arm. The aftermarket 12 bolt housings have the torque arm mount cast into the housing.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley