Name this leaky part

[JeepGirl1013]

Trying to locate the source of atf leak.

My trans pan for sure. Got a lube locker and new pan this one is bent up.

Couldn’t fully remove the skid plate but got it to the side and this is what I am seeing. What do I tackle next?

 

[reddvltj]

Trying to locate the source of atf leak.

My trans pan for sure. Got a lube locker and new pan this one is bent up.

Couldn’t fully remove the skid plate but got it to the side and this is what I am seeing. What do I tackle next?

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Start by getting the trans pan leak taken care of. Everything from there back could just be blown back while driving down the road. Once you get the leak fixed clean everything thoroughly with hot soapy water or what ever cleaner/degreaser you decide to use... Once it's clean and dry you can either put the skid back on and take it for a drive, or jack it up put it on jack stands and let it run in drive for a while and check for leaks again.

 

[Brianj5600]

That is the transfer case. It is hard to tell where it is leaking from the picture.

 

[TokenJo]

Start by getting the trans pan leak taken care of. Everything from there back could just be blown back while driving down the road. Once you get the leak fixed clean everything thoroughly with hot soapy water or what ever cleaner/degreaser you decide to use... Once it's clean and dry you can either put the skid back on and take it for a drive, or jack it up put it on jack stands and let it run in drive for a while and check for leaks again.

Agree w/Red. Probably blow back from transmission pan leak. Clean and recheck in a week or two after pan fix.

 

[JeepGirl1013]

Start by getting the trans pan leak taken care of. Everything from there back could just be blown back while driving down the road. Once you get the leak fixed clean everything thoroughly with hot soapy water or what ever cleaner/degreaser you decide to use... Once it's clean and dry you can either put the skid back on and take it for a drive, or jack it up put it on jack stands and let it run in drive for a while and check for leaks again.

Agree w/Red. Probably blow back from transmission pan leak. Clean and recheck in a week or two after pan fix.

Thank you! Will do. Where are the most common leaks here? What is the connecting point between the transmission and the transfer case?

 

[reddvltj]

Thank you! Will do. Where are the most common leaks here? What is the connecting point between the transmission and the transfer case?

Most common leak is the transmission pan.

The extension housing or tailshaft housing is between the transmission and the transfercase, there should be a seal that resides in the tailshaft that the input shaft of the transfer case goes into.

The transfer case isn't particularly known for leaking since they went to an integral output shaft seal with the TJs instead of the output shaft sealing on the drive shaft. Does that mean you don't have a leak in the t-case? No not necessarily but it's much less likely than (in order of most to least likely) the transmission pan, transmission front seal, transmission to transfercase shaft seal, spedometer drive gear, shift shaft seal.

Just for reference your transmission "should be" the Chrysler 999, or otherwise known as the 32RH. It's a 3 speed non-overdrive, and your transfercase should be the NP 231 J.

 

[hear]

Just for reference your transmission "should be" the Chrysler 904, or otherwise known as the 30RH. It's a 3 speed non-overdrive, and your transfercase should be the NP 231 J.

Unless you know something I don't about her jeep, it's going to be a 32RH since her profile says she has the 4.0. Regardless, 30RH, 32RH, 999, 904, TF-6....the names have evolved over the years but they are all extremely similar on the insides.

Anyway, I agree with the guidance here. There are technically a lot of places these things can leak from, but if you know you have a pan leak get that fixed. Then clean & dry it all really good. It will be a tough job based on your pics. Once clean, you can stuff paper towels around some common areas and see what comes back red after letting it sit overnight. FWIW, nearly every transmission leak runs to the pan, so everything looks like a pan leak eventually.

 

[JeepGirl1013]

Most common leak is the transmission pan.

The extension housing or tailshaft housing is between the transmission and the transfercase, there should be a seal that resides in the tailshaft that the input shaft of the transfer case goes into.

The transfer case isn't particularly known for leaking since they went to an integral output shaft seal with the TJs instead of the output shaft sealing on the drive shaft. Does that mean you don't have a leak in the t-case? No not necessarily but it's much less likely than (in order of most to least likely) the transmission pan, transmission front seal, transmission to transfercase shaft seal, spedometer drive gear, shift shaft seal.

Just for reference your transmission "should be" the Chrysler 904, or otherwise known as the 30RH. It's a 3 speed non-overdrive, and your transfercase should be the NP 231 J.

Thank you! Sometimes my biggest struggle is just knowing what to google next. I appreciate the list and helping me learn!

 

[JeepGirl1013]

Unless you know something I don't about her jeep, it's going to be a 32RH since her profile says she has the 4.0. Regardless, 30RH, 32RH, 999, 904, TF-6....the names have evolved over the years but they are all extremely similar on the insides.

Anyway, I agree with the guidance here. There are technically a lot of places these things can leak from, but if you know you have a pan leak get that fixed. Then clean & dry it all really good. It will be a tough job based on your pics. Once clean, you can stuff paper towels around some common areas and see what comes back red after letting it sit overnight. FWIW, nearly every transmission leak runs to the pan, so everything looks like a pan leak eventually.

We scraped a lot of crap off the skid plate tonight. We were trying to get it off completely but I have one bolt that is spinning and we couldn’t get anything to work to get it off. I’ve power washed and soaked degreaser all over but I’m just going to have to hand scrub everything. We have to drive this weekend though so for now it’s looking a lot better. I’ve got lots of fun summer projects!

 

[reddvltj]

Unless you know something I don't about her jeep, it's going to be a 32RH since her profile says she has the 4.0. Regardless, 30RH, 32RH, 999, 904, TF-6....the names have evolved over the years but they are all extremely similar on the insides.

Anyway, I agree with the guidance here. There are technically a lot of places these things can leak from, but if you know you have a pan leak get that fixed. Then clean & dry it all really good. It will be a tough job based on your pics. Once clean, you can stuff paper towels around some common areas and see what comes back red after letting it sit overnight. FWIW, nearly every transmission leak runs to the pan, so everything looks like a pan leak eventually.

Yes the 4.0 uses the 32rh. That's my mistake. I must have mixed up her engine with another thread I was responding to. They're all based of the 727 Torqueflite.

The advice stays the same though... it's just a stronger built trans. More clutch plates and heavier duty bands.

I'll go back and edit my previous post..
Thanks for the catch.

 

[reddvltj]

We scraped a lot of crap off the skid plate tonight. We were trying to get it off completely but I have one bolt that is spinning and we couldn’t get anything to work to get it off. I’ve power washed and soaked degreaser all over but I’m just going to have to hand scrub everything. We have to drive this weekend though so for now it’s looking a lot better. I’ve got lots of fun summer projects!

You're most likely going to have to cut the one that broke loose off. Hopefully you don't have a major rust problem and the frame there is still good. If so you can get new nutsert kit to replace the one that broke loose or all of them depending on your preference.

https://blackmagicbrakes.com/ has the kits

Good video showing what you need to do.

 

[JasterMereel42]

Here are some common trans leaks.

1. Trans pan gasket (replace the gasket and make sure the bolts are to torque specs)
2. Output shaft seal of the trans (there is a weep hole that indicates that it is bad)
3. Transfer case input shaft seal (the trans output and the TC input link up and share the weep hole)
4. Shift shaft seal on the drivers side of the transmission

For any of these, the key is to get everything cleaned up so you can trace the leak. Sounds like you are in the process of doing that. I would recommend getting some anti fungal foot powder spray. It sounds ridiculous, but I used it to successfully track down some trans leaks on mine. Once everything is cleaned and dry, spray the foot powder all over the place. You'll eventually see it turn from white to pink as it comes in contact with the trans fluid.

For the shift shaft seal, it is pretty easy to trace that though. Clean that area thoroughly. Then, wrap a paper towel or shop rag around it and let it sit for 12 hours. If the bottom of the paper towel is red, then it is the SSS.

Also, be prepared to have multiple leaks. When I got my TJ a year ago, both the output shaft seal and the shift shaft seal were leaking. That was frustrating to figure out.

 

[99greenTJ]

We were faced with a very similar problem, last month. There was trans fluid everywhere, skid pan full of old oil and debris.
I would suggest the transmission shift selector shaft should be looked at as a possible source for the greatest about of fluid loss.
We still have a few drips from the trans/transfer case, but non compared to the leaking seal on the selector shaft.
I have posted a review of the tool to remove and install the seal, recently. Gives you an idea what area this seal is in.
"Review of a transmission gear selector seal removal replacement tool"
We had the skid plate off, looking for areas leaking,

 

[JeepGirl1013]

Here are some common trans leaks.

1. Trans pan gasket (replace the gasket and make sure the bolts are to torque specs)
2. Output shaft seal of the trans (there is a weep hole that indicates that it is bad)
3. Transfer case input shaft seal (the trans output and the TC input link up and share the weep hole)
4. Shift shaft seal on the drivers side of the transmission

For any of these, the key is to get everything cleaned up so you can trace the leak. Sounds like you are in the process of doing that. I would recommend getting some anti fungal foot powder spray. It sounds ridiculous, but I used it to successfully track down some trans leaks on mine. Once everything is cleaned and dry, spray the foot powder all over the place. You'll eventually see it turn from white to pink as it comes in contact with the trans fluid.

For the shift shaft seal, it is pretty easy to trace that though. Clean that area thoroughly. Then, wrap a paper towel or shop rag around it and let it sit for 12 hours. If the bottom of the paper towel is red, then it is the SSS.

Also, be prepared to have multiple leaks. When I got my TJ a year ago, both the output shaft seal and the shift shaft seal were leaking. That was frustrating to figure out.

Yes this is my thought. I expect multiple leaks. When we first changed our transmission fluid I seemed to have a very slow leak and the pan was fine. But I think our gasket bit the dust. So while I’m down here I want to check as many places as possible. Foot powder is a new one!

 

[JasterMereel42]

Yes this is my thought. I expect multiple leaks. When we first changed our transmission fluid I seemed to have a very slow leak and the pan was fine. But I think our gasket bit the dust. So while I’m down here I want to check as many places as possible. Foot powder is a new one!

I thought it was a crazy idea at first, but it works and helped me track down leaks.

https://www.amazon.com/gp/product/B000RWBO7Y/?tag=wranglerorg-20

 

[JeepGirl1013]

You're most likely going to have to cut the one that broke loose off. Hopefully you don't have a major rust problem and the frame there is still good. If so you can get new nutsert kit to replace the one that broke loose or all of them depending on your preference.

https://blackmagicbrakes.com/ has the kits

Good video showing what you need to do.

My frame is in good condition. There was very minor rust on all of the other bolts they came off easily. We tried to cut it out. We tried the pry bar trick to get the nut to grab and nothing worked

 

[reddvltj]

My frame is in good condition. There was very minor rust on all of the other bolts they came off easily. We tried to cut it out. We tried the pry bar trick to get the nut to grab and nothing worked

Not sure what you used to try to cut it out with but a torch or cut off wheel to cut the head of the bolt off, are the 2 best options.

I had to use the ol'e hot knife on a bolt for my transmission skid when I replaced my engine. I'm not looking forward to dropping my t-case skid when I do the tummy tuck. I'll probably be ordering the kit from @mrblaine and BMB when I do get around to it.