your 756 has a hydraulic TA. In high (direct drive), the DD clutch pack is locked. as long as everything is in proper condition, there should be no wear on it.
in TA, the DD clutch is released; again no wear on it.
When in TA, the sprag is transmitting power, and the TA lockup clutch (primarily to prevent over run) is locked. again, no wear there, unless something is wrong and it slips.
When in DD, the sprag is being over run, and although lubricated with trans fluid, it does wear very slowly.
So my advice is, use the TA as another gear, like has been mentioned. when doing stationary PTO work, I like to leave it in TA to prevent excessive wear on the sprag.
if the TA has been replaced with a mechanical diode, there is no sprag, so there is no issue.
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