i have also has good luck with the motive stuff.
they have a line called "stock performance" it is made from the same material that their other gears are made from but the surface finish is much better. i don't know if they have that ratio for that series carrier but you should check them out.
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'78 Ford Fairmont 526ci pontiac; true 10.5 tires and stock suspension.
5.14 @140.5 w/nos; 8.86@151 all motor.8.17@172 1/4 mile w/nos
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