Crabbing

Kent mosby said

I measured the trans crossmember to leaf spring mount ( frame points) 52.25 rt side and 52.00 on driver side. From leaf spring mount to center of housing is 22.00 each side. The discrepancy is that the leaf spring mount is more forward on the drivers side. Shims should take care of it. I hope. Is this what you are saying?

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when i was adjusting the strut rods in my car, i dropped points to the ground from the torsion bar sockets and them from the centerline of the bolts in the lower ball joints. adjusted so that both sides were equal.
i would measure from the same point on the crossmember to the front leaf spring mounts and possibly another point on the rear housing as well. sounds like you've already done this.
I think i saw .250" shims just for this purpose on the Bergman website. sounds like it's a common thing...

edit, they are 1/8"
BAC Rear Axle Shims - Bergman Auto Craft