Engine/Transmission (1994 - 1998) Trans rear seal/T-Case Input seal leak

[PRohr]

I installed a new T-case input seal and I assume the trans guy put a new rear seal on the trans when it was out and rebuilt. I have a leak coming from this area. I can see the drip there there the T-case and Trans bolt together. When I did the T-case seal I had to pull the bering retainer cover off and drive the seal in and put it back together. I looked for grooves and drug my finger nail along the area and it never caught anything. I used the new double lip seal as well. These are the only two seals that can cause this leak right? Both seals ride on the T-case input shaft as well right? The Rear trans seal rides on the T-case input shaft as the trans output shaft slides into the T-case input. If the speedie sleeves were a bit cheaper I would put them on both seals but at $40 a pop I'd rather not just throw them on there. Any thoughts? Anyone have the seal P/N's they use with good luck. I have found Timken, National and SKF seals.



I have two P/N for the input T-Case input seal:



BCA/NATIONAL Part # 710928 - Dual lip and I use one

or

BCA/NATIONAL Part # 3173 - Single lip and I would use two



Napa has NOS19255



I get this one for the rear trans output seal



ATP Part # TO38

Napa lists NOS19211 for the rear trans seal



Any thoughts?

 

[CumminsPower98]

You are correct that these two seals are the only place oil can come from in there (aside from the t-case bearing retainer - not likely) and also that they both ride on the t-case input shaft. The rear trany seal is probably the more likely one to be leaking. Also its not likely that your t-case input is worn to the point of leaking. Mine has 403k miles and doesn't have any seal grooves. Maybe one of the seals got damaged during installation.

 

[PRohr]

I slid und ther truck last night and cleaned some things up so I can get a better idea where it's coming from. I noticed a couple drips where the case splits and at first I thought is was just from the wind pushing it back the case..... then I noticed one was a bit higher..... so i got the FSM out and the torque wrench and went around all the case bolts and they were a little loose. So I'll keep an eye on that and get the trans seal coming from Napa. It's a PITA but it's easier to pull the T-case than the trans.