on a tundra (automatic differential disconnect), youre really only keeping the transfer case lubed--the front diff is always in motion. switching the transfer case and differentials to a synthetic lube will extend their life, as the synth will cling to the parts longer when not in use--better protection for the gears and chain.
find a dirt road or 4wheel trail in the summer, dry pavement is a great way to build up stress in the driveline and break something in the front drivetrain.
-s
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