Transfer Case to Transmission Leak?

[2ndfj40]

Can my transfer case leak into the transmission (79FJ40)? Seems to be happening????

 

[SuperFish]

Yes it can. It's not uncommon.

 

[Pighead]

Yes it can, has happened before.

 

[2ndfj40]

So I presume the appropriate seal replacement means dropping the transmission and transfer case, dismantle and probably do all seals while you're at it type thing - fairly major surgery right?

 

[SuperFish]

Or you could do this

Scroll down the page to Trans/Transfer Oil Return:
Specter Off-Road Land Cruiser Parts - Page 062 Land Cruiser 4 speed Transmission

I would do it right though.

 

[Pighead]

So I presume the appropriate seal replacement means dropping the transmission and transfer case, dismantle and probably do all seals while you're at it type thing - fairly major surgery right?

Not necessarily. Leave the tranny where it is, pull the transfer case off, clean off the old paper gasket, replace with some RTV and bolt the transfer case back on.

 

[2ndfj40]

OK, thanks for the replies. I like the idea of just removing the transfer case (or partially removing to get gasket access).

Anybody happen to have a pic or part diagram to show exactly which seal/gasket is the culprit.

 

[John Smith]

OK, thanks for the replies. I like the idea of just removing the transfer case (or partially removing to get gasket access).

Anybody happen to have a pic or part diagram to show exactly which seal/gasket is the culprit.

Here you go.

 

[onseytote]

transfer case Very clear pic, it's going to help a lot in detecting the problem.

 

[vk7ybi]

Replacing the seal might not help a lot.. Gear oil gets pumped through the splines on acceleration/deceleration, replacing the seal wont help this.. Install the return tube and be done with it..

 

[2ndfj40]

So finally getting around to some winter projects. Bought the return tube loop from SOR. It seems really long - like a couple feet plus. Is this right? Anybody got an installed pic?

 

[Alberta FJ]

I had that problem a few years back I just resealed the trans & T-case but it wasn't leaking through the splines, it was very easy to just pull the case about 2hrs & I was back on the road. Good luck!

 

[Pin_Head]

Replacing the seal might not help a lot.. Gear oil gets pumped through the splines on acceleration/deceleration, replacing the seal wont help this.. Install the return tube and be done with it..

This is correct. It is usually not the seal on 4 speed trannys, but worn splines.