Moved rear end back 1.5

CultClassik said
Again it has no effect on the placement of the axle on the spring. No measurable weight differences. No effect on hookup.

Gotcha. I thought people were moving the axle on the springs, sounds like you're saying move the spring hanger back farther.

Correct, moving the placement of the axle on the spring, which would change the length of the front segment. That could cause a big problem.

451Cuda said
'67-'69 Barracuda has a 108 inch wheelbase

'67-'76 Dart Hardtop has a 111 inch wheelbase, basically a 3 inch stretch rearward compared to the Barracuda.

Both cars perform exactly the same at the dragstrip.

Move the rear back.

Thank you. Science, math, logic.