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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No. I'd have the car put on a dedicated frame machine using a datum plane. It's beginning to sound like the difference is in the car itself. Shims won't take care of the discrepancy between the cross member and spring mount at the frame. I guess it just all depends on "how right" you want it. It's entirely possible it's been like this from birth.