I'm currently running 3.23's in my 79 T/A 8.5" 10-bolt, and it's the original carrier. When I first bought the car, the previous owner had a set of 4.10's in it. I don't know if any spacers were used for the 4.10's, but none are used for my 3.23's. You shouldn't need a spacer for the gears you mentioned.
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