I can remember seeing the challenger run division 5 points meets back in the late 70's.
You have more pics of the car?Did this on my Challenger also. Mini tubbed it to the frame rails and narrowed the Dana 60 to fit. Now I can fit a 315/60/15 Drag Radial or 29.5X10.5W slick. Also went with spool, 40 spline gun drilled axles.
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