theblur98ss

iTrader: (71)

Just got my 4l80e installed and started filling it up. It is leaking toward the rear of the driver's side where the big round connector is. What is this connector? I don't have any of the wiring harness hooked up yet. I noticed I can push in on the connector as well and it will go back into the tranny.

FLT

iTrader: (1)

That is the main case connector. The wiring there controls the transmissions electronics. Sounds like the connector does not have the tabs that keep it in place properly intact. Meaning broken or collapsed. You probably need a new harness.

theblur98ss

iTrader: (71)

Maybe I wasn't clear....there are no wires hooked upto the tranny yet. Is that the problem? Does the wiring harness also seal that area?

FLT

iTrader: (1)

No the connector in the case has an oring on it. However from what you described it sounded like the connector was pushing completely back into the trans. Maybe take a couple photos to make it easier to diagnose.

RamAir02TA77

iTrader: (3)

Maybe try pulling the connector out of the trans a bit I know mine sometimes pops inside the trans when trying to plug the harness into it so I have to pull it back out some.

theblur98ss

iTrader: (71)

Yes the connector will slide back into the tranny. I'll do some digging tomorrow but it may be tough to get a pic of it. This is a brand new tranny I should add. Is the O ring replacable?

daniel6718

iTrader: (36)

problem isnt the o ring hes sayin there are clips on the connector that make it apply pressure to that o ring for the seal

FLT

iTrader: (1)

If you have a brand new trans that is doing this contact who you got it from and make them send you a new harness. I find that used harnesses will do what is happening here. I always replace internal harnesses when building 4l60e or 4l80e transmissions just to eliminate the simple problem that you are having. Vince

chargedvx6

There is also and aftermarket retainer that can be attached to the pressure solenoid retainer inside the pan to stop the plug dropping in the pan cavity just in case.

theblur98ss

iTrader: (71)

I bought the tranny from a member on here so the builder probably wont' give me much support. Is the harness something I can change? With the tranny on the car? Just by looking it appears I could drop the pan and it may be right there.

cablebandit

iTrader: (37)

you can change it while its in the car. pull the pan...push the plug outwards of the tranny and see if it clicks and locks into place...if not, get a new harness

Z'mnypit

iTrader: (58)

Mine did the same thing when I first swapped to the 80e. I didnt cut a hole for the plug and once the crossmember was bolt up it pushed the connector in the trans about 1/4in or so and leaked all the time. I dropped the trans, cut a square, dropped the pan slid the connector back out and put everything back together. Been fine every since.

theblur98ss

iTrader: (71)

I think this is exactly what happened. I cut the hole too high up. I just dropped the tranny and that makes total sense.