Mud in my Veins
Join Date: Dec 2000
Location: Memphis, TN
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Re: Al d-shafts
Late-model 2WD F-150's use them, and the whole F-series might, so Ford thinks they're OK for at least some truck applications.
Aluminum is more brittle than steel, meaning it cracks rather than stretches when it gets deformed. (Ever see an Al rim that's hit a rock?) It's also not as strong by weight. These 2 factors mean that an Al shaft has to be bigger,thicker, and more precisely engineered than a steel one would.
I'd just get the steel one balanced.
83 Custom w/95 4.9L EFI, 78 NP435, 83 NP208, 83 D44IFS 3.07, 87 Ford 8.8ABS 3.08, Michelin LTX AT 31x10.50R15