Replacing rear output seal on transmission--possibly (probably) dumb Q

[lasoundguy]

OK, I'm working through transfer case gears and got the case removed. I'd like to replace the output seal on the back of the transmission (purchased P/N 90311-48016.) I've not pulled a seal with a shaft protruding out--how exactly does one do it?

Thanks in advance.

 

[chap79]

I used a screwdriver with some electrical tape on the tip to prevent scratching. Whatever method you use make sure to not mar the surface. Some thin shims or something to protect the outer edge. Mine came out pretty easy IIRC.

 

[Rusty Marlin]

Take a flat blade screw driver and place it near the outer edge of the seal, // to the shaft, and swat it with a hammer to crease the seal's metal cup. It will release the tension on the seal and it will slide out quite easily.
As warned above, be careful of the transmission case and don't scratch the seal's bore.

 

[lasoundguy]

View attachment 2317230

Take a flat blade screw driver and place it near the outer edge of the seal, // to the shaft, and swat it with a hammer to crease the seal's metal cup. It will release the tension on the seal and it will slide out quite easily.
As warned above, be careful of the transmission case and don't scratch the seal's bore.

Thanks @Rusty Marlin , that explains it. Appreciate it!

 

[flintknapper]

Thanks @Rusty Marlin , that explains it. Appreciate it!

The seal puller you pictured is designed mainly for seals that allow you to access the inner diameter (as you have already discovered). So the method @Rusty Marlin suggests can and does often work.

Alternately, for stubborn seals...you can drill a hole in the seal face (being mindful of anything behind it) and use a wood screw (of slightly larger diameter) to give you something to pry on. The pic below shows how I use that method (pic is of a lawn mower engine), but the same principle applies.

Good luck,

Flint.

 

[SmokingRocks]

How deep do you seat this seal? I can't find it in the FSM

 

[csanders]

Reviving this thread with another dumb question. Does the transmission output shaft need to be greased (or need anti-seize or something else on the splines) before sliding the transfer case back on?

 

[CharlieS]

I've done this job twice and don't remember lubricating the shaft.

 

[flintknapper]

Reviving this thread with another dumb question. Does the transmission output shaft need to be greased (or need anti-seize or something else on the splines) before sliding the transfer case back on?

No.

 

[bicycleagent003]

This thread is very timely. Thanks to the OP and those who replied. Much appreciated.

 

[calokie]

I’m doing this job today and just like “SmokingRocks” mentioned,
How deep do you set the seal?
When I install my seal it’s very difficult to get it flush with the transmission face surface, will the seal self seat after installation and when things get spinning

 

[flintknapper]

I’m doing this job today and just like “SmokingRocks” mentioned,
How deep do you set the seal?
When I install my seal it’s very difficult to get it flush with the transmission face surface, will the seal self seat after installation and when things get spinning

Typically....seals that seat into 'bores' are interference fit....so no, it will not continue to seat itself after installation.

In most applications a seal is designed to seat 'flush' with the surface or just below.

 

[calokie]

Typically....seals that seat into 'bores' are interference fit....so no, it will not continue to seat itself after installation.

In most applications a seal is designed to seat 'flush' with the surface or just below.

Thanks
I ended up installing it flush with the face with the assumption the T-case will eventually seat it once torqued down

 

[HHR137]

OK, I'm working through transfer case gears and got the case removed. I'd like to replace the output seal on the back of the transmission (purchased P/N 90311-48016.) I've not pulled a seal with a shaft protruding out--how exactly does one do it?

View attachment 2317014

Thanks in advance.

Pretty new to 80 series and I believe I have a leaking trans output seal as well. I’ve got ATF that appears to be leaking from my transfer case. I just did a drain and refill of the transfer case and I don’t appear to be leaking gear oil just ATF. If possible could I get a step by step guide as I don’t want to pay a shop. Alternatively if someone has a link to a good video that would be great. THANKS!

 

[hisandhers80s]

I too am in this same boat. Did you figure this out and have any advice on how you did it?

 

[CharlieS]

To replace the output seal on the transmission you need to first remove the transfer case. It is a lot of time and effort to replace a seal that costs a couple of dollars. I've only done this seal replacement when I had a transfer case off for another reason and the transmission output seal was already accessible.

 

[hisandhers80s]

To replace the output seal on the transmission you need to first remove the transfer case. It is a lot of time and effort to replace a seal that costs a couple of dollars. I've only done this seal replacement when I had a transfer case off for another reason and the transmission output seal was already accessible.

I am re-gearing the transfer case and have both the transmission and transfer case out of the truck at this point. Will be separating them today or tomorrow.

 

[CharlieS]

I am re-gearing the transfer case and have both the transmission and transfer case out of the truck at this point. Will be separating them today or tomorrow.

Then you are in the best place to pry that sucker out and pop a new one in! It is super easy.

 

[HHR137]

I am re-gearing the transfer case and have both the transmission and transfer case out of the truck at this point. Will be separating them today or tomorrow.

No I haven’t messed with it yet. I’ll be taking it to a shop this week. I will update the post after.

 

[HHR137]

No I haven’t messed with it yet. I’ll be taking it to a shop this week. I will update the post after.

Also, I believe I am the cause for the league. When I first got the car, I did a drain and refill. I did not measure how much came out. I just assumed it was approximately 6 quarts. After checking the fluid level, I realized when the engine is warmed up and not running I am over at the hot mark on the dipstick. I believe I over filed it and probably caused it to leak lol.