Re: Rear Axle Keys
The original keys are cheap/easy to obtain and made as Ford made them to perform intended function. I'd stay with that metal / key.
Because of the fit of the rear axle/hub, I occasionally check/recheck to ensure proper torque. IMO, you WILL be surprised at what you find, that is, that re-torque check is worthwhile.
Only possible exception would be 'perfect' mating/lap joint, IMO.
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