Pinion angle question

[dirtywaterdiver]

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So, I have an engine angle of zero° and a rear end angle of 4°. I understand between zero and 3° is ideal for drive shaft angle. I can't for the life of me figure out how to change the trans end since there is no play in the motor mounts, but I can add an angled shim to the rear end under the leaf springs. What would be the correct fix?