Thread: Installing TH400

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First time I've installed a tranny. Bought a rebuilt installed it in the truck then poured 4 quarts of fluid in it of which about 1 quart leaked out the tail shaft. Is this normal did I over fill it or has the rebuilder done something wrong?

Did you have the engine running at the time? Do you have the drive shaft installed?

4 quarts??? did you fill the converter before putting it in?

Originally Posted by pro70z28

Did you have the engine running at the time? Do you have the drive shaft installed?

I am just coming to the end of a 6 year frame off build. The engine is a crate engine and I have yet to fire it up, so no the engine was not running and yes the drive shaft is installed

Originally Posted by pro70z28

Did you have the engine running at the time? Do you have the drive shaft installed?

I am just coming to the end of a 6 year frame off build. The engine is a crate engine and I have yet to fire it up, so no the engine was not running and yes the drive shaft is installed. The torque converter has about 2 quarts of fluid in it

You need to have it running to circulate the fluid in the trans & converter as you add fluid.

Originally Posted by pro70z28

You need to have it running to circulate the fluid in the trans & converter as you add fluid.

Thanks, it makes sense as all I'm doing without the engine running is over filling the tranny pan. I was assuming the tailshaft was sealed but obviously not.

I like to have the rear end up on jackstands so I can run the trans thru the gears (& reverse) to make sure the fluid is everywhere it needs to be. I also recheck it after it has a few miles on it.

The fluid probably came out of the vent on top rear of tranny and not out of the tail shaft. That is if you had the drive shaft in it ?

If you had the drive shaft in and it was leaking out around the yoke you may need to replace the seal. If the drive shaft was in and not connected to rear you could have opened the seal enough to leak.