When driving the car, the transmission gears and bearings get lubricated
by the oil splashing around inside. It splashes around because the
laygears are spinning all the time because the input shaft is spinning
all the time. When you tow a car with the driveshaft connected, the
engine is not turning, so the input shaft is not turning, so the laygear
is not turning so the oil is NOT getting splashed around. The rear tail
bearing is NOT getting lubricated, the rear main bearing is NOT getting
lubricated, the mainshaft is NOT getting lubricated, the syncros are NOT
getting lubricated, but they are all spinning around. For short
distances, not a problem. For longer distances, if you fire up the car
for a minute or two every time you gas up the tow vehicle and still
leave it in neutral to let the laygear splash the oil around you should
be getting enough lube on the mainshaft and its components to keep it
from burning up until the next stop.
mjb.
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