2nd gen 6MT transfer case to transmission

Everyone,

I have searched high and low for the answer to this question unsuccessfully. Here’s what I have going on.

I have a 2015 access cab 6spd 4WD Tacoma. I’m leaking gear oil from where the transfer case and transmission mate. A long time ago I did a FJ swap and not long after the leak started. I’m finally annoyed enough with it to address it.

I’m thinking it’s gear oil from my transmission cause when I (frequently) check to make sure the transmission and t case are full, I usually have to add a little to the transmission. That’s all I have to go on for now.

my question: is there a seal on the transmission where the t case splines go into? Or is it sealed with the O ring only, on the housing of the T case? The only transmission output shaft seals I can find and threads to match are related to 2nd gen automatics and 1st gen manuals.


This pic is from another thread on here, it’s not my truck, however the parts are the same as mine. On the transmission where the t case splines go into, is there a seal in there? I cannot for the life of me find it, what it’s called or a part number. OR, is it just sealed by the O ring only on the t case?

I appreciate any advice

 

It looks to me like it's just the o-ring that serves as the seal. Also, when eatsleeptacos did his auto to manual input shaft swap for his manual FJ Cruiser transfer case, I feel like I remember the write up included that he forgot to add the o-ring and lost the contents of his tranny fluid on the garage floor. The o-ring is easy enough to damage when assembling the gearboxes, so that would be my best guess for your leak.

I don't see a seal on this diagram:



I thought maybe this one had a seal there, but when I click on the part number to get an image of what's included in that seal kit, it just looks to me like the forward/bell housing seal

 

So much labor for one little O ring. Thanks for replying. That at least confirms what I’m seeing. You’d feel like it’d be more than that. I guess not

 

Use Syl-Glide or another PTFE enhanced silicone grease on the O-ring and mating surface when assembling, it will help the o-ring stay in place and provide a lubricant to prevent the o-ring from being damaged.