T98 Trans Leaking / Need Help

1964 cj5 with f134, t98 trans, dana 18 transfer case.
I've had a small leak coming from what looks like mounting points for a shaft that runs cross-wise at the top of the trans. I haven't ever worked on the trans yet so im not sure what the exact spot is called but it leaks from both sides. Seems to be a pivot point for some sort of internal circular shaft.

It was a slight leak until last night. I was at a car show and parked on a forward-sloping parking spot for a few hrs. On the drive home, I heard a slight squeak/screech when the clutch was let out and the engine under load. Sounded like oil on the flywheel.

Crawled under to find more oil dripping out of those circular areas (in first 2 pics) and also from the front of the transmission where it meets the bellhousing, and the bellhousing itself.

Could this be from being parked tilted forward? Maybe an oil overfill? Or does the trans/transfercase/clutch need a good going through?

The PO stated someone about 10 years ago "totally rebuilt" the trans/t-case/clutch etc. But Im not opposed to doing it again if need be.

There is only a few drops of oil a week usually under there but this was a half dollar overnight.

Any advice is appreciated. Things to check on, things that could be replaced, etc. I was gonna install an overdrive this winter so if it ends up being a trans/clutch/t-case job. It wouldn't surprise me haha.

Thx in advance!

 

I filled it in the spring but just to the top of the upper fill hole.

 

Yes. I meant oil level is right up to the bottom of the fill plug. Is that with that upper hole that is leaking is called? The pipe plug? There isn’t a lot of information around about the T98 so I’m kind of in the dark with it. Thanks in advance for your help.

 

Seems like a bit of a fluke. I would clean it off, check level, make sure the bolts are tight to the bellhousing, and monitor it. Are you not allowed to drip oil in california? I know pennsylvania you cant or itll fail inspection

 

in your first pic, starting from the bottom up....the first square headed plug is the drain plug, the second square headed plug is the fill hole/level, and the third....hex head....is something not related to the oil level.

 

Yes. This is all correct and the oil level was filled to the "middle" plug/upper square head. For some reason, the oil is leaking from the top/hex head and the equivalent blank circular area on the other side of the trans casing. I dont know what purpose they serve though so I'm trying to figure out if they are spots that have maybe an o-ring inside that goes bad, or a high wear area, or if by filling the oil up to the upper square plug rather than just measuring out a pre-set amount of oil before adding... led to a possible overfill. Make sense?

It seems like an overfill is unlikely based on what you're saying though. So I think I need to figure out why those spots are leaking through normal use.

 

What is the level in the t-case? They share oil through the output bearing of the T98?

I'd pull the 98s fill plug and see what comes out if anything. Then do the same to the 18.

 

The '58 I used to have had this setup. Something would cause the oil to migrate from one to the other (don't remember which way around).

 

Did you ever figure out a solve? I just checked the levels and the transmission was overfilled by about 2oz and the transfer case was 8oz low. Seems like the oil is migrating forward and then leaking out.

 

Just bumping this up. Anybody know a reason the oil might be migrating forward from the t-case to the trans? The t98/dana 18 are separate sealed systems normally.

 

Sorry for the delay in response. i never did figure out how to fix the issue. For me, it didn't get to the point of leaking oil any more than normal. I just filled both to normal level and then didn't try to refill the one going low. That would just keep pumping to the higher one and eventually create your leakage issue. Question for others who might know: could this be a plugged ventilation problem?

 

O

 

Yes on a plugged vent.

 

Is this something thats fixable without taking it apart? Pardon my ignorance

 

Yes it's on top of transfer case on the front output housing if you remove floor cover it's easier to access just unscrew it and soak it in solvet then blow out don't worry if you damage it removing they are readily available to get a replacement.

 

I used a 90 degree barbed fitting on the t-case and transmission with a hose and a tee with a check valve type vent attached high up on the firewall.