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Old 12-13-2021, 08:57 AM   #21
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The main shaft on lost T cases spins everything unless the case is in N, then the input shaft is disengaged .. are the Toyota cases not like the GM? Are they instead lubed by the input shaft spinning?

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Old 12-13-2021, 09:08 AM   #22
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Quote:
Originally Posted by Booyah45828 View Post
This.

The only ones that I've seen personally with a output driven pump was on some of the old 2 speed powerglides used in the 60's.

AFAIK, there aren't any rear pump manual transmissions. Their lubrication is provided by splash from the countershaft turning. The countershaft only turns when the input shaft is turning. So if you're driving along with the engine off, trans in neutral, and clutch pedal up, there is little to no lubrication occurring. You're relying solely upon the little bit of lube present at the bearing.

Now I'm not saying I haven't flat towed vehicles in without removing the driveshaft. But it's typically only a few miles at most, and even then damage can still occur.

I remember something about a rear pump option on some of the old GM transmissions.. ive never seen one perosnally..



I had an old mercedes diesel a long time ago which had a rear pump in its automatic.. those old diesel transmissions (no idea what it was i never had to take it apart and honestly never changed its fluid or filter).. had such a tight torque converter you could put them in N and roll the car about 15 MPH then slam it into 'D1' and it would start esp in cold weather when the fluid was thick.. ...
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Old 12-13-2021, 10:46 AM   #23
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Originally Posted by cadillackid View Post
The main shaft on lost T cases spins everything unless the case is in N, then the input shaft is disengaged .. are the Toyota cases not like the GM? Are they instead lubed by the input shaft spinning?
Correct. The last toyota transfer case I had apart, the input shaft spun an idler gear which turned the pump. So in neutral the pump wasn't turning.

Gm, which uses mostly new process/new venture, have always had the pump driven off the mainshaft. Borg warner transfer cases are similar, if they have a pump in them.
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