Did you do a good measurement of the third member and verify the set-up on the third member? Often the pumpkin is offset from center to make sure the drive line has a few degrees offset.
Did the shop set up the rear end based on the pumpkin location or the true center of the third member (based on the hubs)?
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DETONATOR - 69 Camaro RS
LS1 - T56 - Chris Alston Frame - 2" drop
G-Link Rear - 4.20 gears in 9" - Mini Tubs
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