Nathan89

Alright this is what I know and don't know. I have a 1991 dodge w150 and I had been noticing some kind of fluid making splatter marks on the side of my truck from driving and something leaking. I tracked down that there is a little black rectagular thing mounted to the passenger side of the engine compartment. It has a total of three hoses attatxhed to it and one is leaking. I tracked it down and found that it is connected on top of the transfer case. So what is this part and why would this line have fluid comming from the transfer case? The rectangular thing has on one side the hoses and the other a material that looks like a filter like material.

Any help would greatly be appreciated, thanks.

78D200

Sounds like the vent tube. Did you recently service (or have serviced) the t-case? If not, you may want to look to see where your transmission level is. The motor will need to be running, warmed up and the tranny in neutral (assuming you have an automatic). If your fluid is low, it could be the output seal on the tranny is leaking into the input seal on the t-case and is causing it to come out of the vent tube when the t-case gets warm.

Have you noticed andy fluid leaking from between the tranny and t-case? Also, if you can post a picture, that would also help us determine exactly what it is (plus we just love pics here ).

Nathan89

K thanks I will try to post a pick later today when I get home from work. No I have not serviced the transfer case lately, however I did check the transmision fluid and it does look low, I gues ile put some in and see what happens.. Doesn't the transfer case have it's own fluid? How would it pull transmission fluid out? Jw? Or maybe I misunderstood you lol.

Nathan89

Also if that is the case what would the procedure be for fixing it?

Thanks for the help!

78D200

The tranny and t-case have their own fluids. Both use ATF but they do not share betwen one another.

The seals could be old, or some debris on in there ruining the seal causing the tranny to leak into the t-case. The output shaft of the tranny goes into the unput shaft of the t-case so there is a chance that the two could leak into each other.

If that is the case, you'll need to drain the t-case, pull the driveshafts out and disconnect the linkage going to the t-case. There will probably be 6 9/16" nuts that bolts that t-case to the tranny. There will also be 6 studs that will be threaded into the t-case. Have a drain bucket under the end of the tranny as when you pull the t-case away, some fluid will come out. At that point there you can then pull the output seal of the tranny and input seal of the t-case out and install new ones. Becareful though as some units only need the seals to be installed so far in. Look to see where the old ones are and go from there when installing the new ones.

If you have not done this before, you may want a second pair of hands as it's easier to remove and install the t-case with two people rather than by yourself.

Nathan89

Thank you for the replys and info!

I now have been looking into getting the input transfer case seal and the output transmission seal and have found nothing at two different auto parts stores.

However i was ordered an adapter seal?? is that what I need?

Srry i just dont know if it is called two things or if there is only one seal that does two things?

I know I should probably just drop it to actually see whats in there i just wanted to have the part so that I can put the new one in right after without leaving it off for a day or two untill my ordered part comes in.

Thanks for the help!

78D200

The old seals should have numbers on them that just about anyone can order from. Some places may call them adaptor seals, transmission output and t-case input seals usually work though just about any where. You may need to go to a decent auto parts store with some knowledgable counter personal. At least that is how it is around here.

Nathan89

OK so i know that i have to probably replace the seal that the red arrow is pointing at (thats the t-case input seal right?).... I think that is the only one though or is there another that i cant see?

maybe behind the bearings on the transmission side?



By the way the seal that my auto parts store ordered was not the right one lol yea the parts stores around here are stupid...

Nathan89

Could it also be leaking from where i drew the blue arrow jw?

78D200

After seeing this, the output seal for the tranny and input seal for the t-case are in the t-case. The seal that you see in the picture is one of two types of seals. There will either be another seal right behind this one, or when you pull this seal out, you'll see that it is a double ended seal. If it is a double ended seal, then you only need one as this type of seal will seal both the end of the transmission and the front of your t-case.

You need to remove those four bolts and pull that plate off. That black stuff is RTV which you will need to clean off and apply a fresh coat of RTV to reseal it. Use a single edge razor blade to clean it all off. Do not use a whiz wheel and disc as these are alum pieces and you'll take off material.

I see some that is either a crank or it is RTV but is kind of hard to tell for sure in the pick.

MoparnewbieW150

Can I have a picture of the power steering pump and emissions pump mounting brackets on your truck..?..please...?