Noticed a puddle under my truck when we got home with the trailer Wednesday night. was raining most of the day yesterday so I didn't crawl under it until today. this is what I found.





It is leaking where the transfer case is attached to the tranny, Is that seal hard to replace?
Also noticed the transfer case is a little loose. Probably where my vibration was coming from when I put it in 4WD the other day.Thanks

 

I found myself completely disoriented by what I thought was your second picture, which I finally figured out was your 2nd and 3rd picture one on top of the other that was visually deceiving, like those puzzles that trick the mind's eye.

I have no advice, just pointing out how I was deceived into thinking you somehow had a transverse oriented driveline for a minute.

 

Is it the tranny or the transfer or both that is leaking? Only way to know for sure is pull the transfer.

The transfer is not to bad to get out, I used an ATV jack to lower mine and slid it out from under w/o jacking up the truck. Total R&R time was about 3 hours with a pneumatic ratchet and 1/2" impact gun.

As for changing the seals I have no idea, I was replaceing my transfer with a scrap yard unit and all the seals where still good on it.

 

Thanks. I think it's the tranny leaking. It only does it when parked facing up hill.
I had been driving the truck to work and parking where it's at now but facing down hill. I noticed that spot where it had been leaking but wasn't sure where it came from (my father in law parks there sometimes). So I'm pretty sure it's the rear seal on the tranny.

 

There isn't really a rear seal on the transmission of a 4x4, only the gasket. There is an input, front and rear output shaft seals on the transfer case. Sounds like the gasket and loose bolts are the culprits.

 

Thanks. I seen the gasket was ripped. That sounds easy enough.
So what goes bad when the tranny fluid fills up the transfer case. Is that the front seal on the transfer case?

 

They are separate and the fluids don't/can't mix. There is an adapter between them that the gasket goes on.

 

Both compartments contain ATF and can, theoretically, mix if the input shaft seal on the transfer case were bad enough. This seal is a "double lip" design and seals both directions. The adaptor "is" the tail housing of the trans and contains no seal. Therefore, ATF from the trans is exposed to this seal through the adaptor/tail housing. I believe another member experienced an "overfill" of his transfer case due to the seal. I have also seen this happen on one of our Chevy company trucks.

 

I would first check the torque on those bolts before dropping the tcase. Might get lucky.

 

I have seen this happen on 4R100's a couple of times.