I just finished rebuildin a 4L60E transmission apparently unsuccessfully. I filled the tranny with fuild shifted into reverse and the to drive, all seemed to be fine so I went to drive. backed up about 20 feet and noticed a fluid leak. the luid is coming out of the vent hose than is attached to the top of the housing. So, I decided to drive to see how it would shift. It shifted to 2nd but acted like I was pulling a house. this was in reverse and forward it just didn't seem to want to go. also, I put 11 quarts of fluid in it and didn'teven show up on the dip stick. also, I did purge the cooler and put a new torque converter. I am confused and need some professional tranny help. I don't know what to do other than catch it on fire.

addtional info on things I did:

Rebuilt pump
Replaced all seals
replaced all clutch packs
replaced torque converter
flushed cooler
replaced front planetary
replaced sun gear shell
replaced all solenoidsand pressure sensor

 

Sounds like the pump gasket is installed wrong because your trans fluid is coming out of the vent under pressure. HTH
John

 

I didn't think the pump gasket would go on but one way??

Update:
I found that the 1-2 shift accumulator had bothe the springs in it from the 1-2 and the 3-4, it had a spring on both sides of the 1-2 accumulator and no spring on the 3-4 accumulator, I have corrected this but haven't got it back together to test yet. Would this have anything to do with the fluid coming out the vent?

 

If you remove the front pump you will see where the vent passage is routed and the pump gasket can be installed or broken and then the vent passage lines up to a pressure circuit. There are some other ways to cause pressure in the vent tube but most are a combination of miss- placed gaskets and hard parts.Good luck and just look at each part and gasket close for being bent out of position or torn.
John