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Again, I'm not a 911 expert, but post #15 is true for front engined cars. The gears that he calls the layshaft ("countershaft" in American) are in the bottom of the transmission where the oil is. These gears are locked to the input shaft from the clutch. If the engine isn't turning, these gears aren't turning. Under normal operation the oil is tossed around in the case by these gears. If engine isn't turning this shaft it doesn't toss lube up to the bearings on the mainshaft. There isn't much of a load on them under towing conditions, so they don't need much oil and running them without the lubricant bath for a while won't hurt them. But go far enough for the lube to run out and the bearings run dry and trash your mainshaft.
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