From The T-Box book...."A center differential(contained in the transfer gear box)driven by the output gear provides full time 4wd by allowing the front and rear output shafts/flanges to automatically adjust their relative speeds to compensate for road wheel speed differences. A mechanical lock...
The stock driveshafts are garbage from the factory. If your still having badf vibes the replacement driveshaft is probably bad...You can get a re-manned front shaft with greasable fittings form Great Basin Rovers. 1-801-486-5049.
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