Mitsubishi 3000GT & Dodge Stealth Forum banner

Transfer case billet aluminum breather

8K views 42 replies 16 participants last post by  OldMadBrit  
#1 ·
This is a part that's not for everyone but those of us who really push these cars at high speeds might have noticed the tendency of the transfer case to push oil out through the breather. This creates a mess under the car and risks starving the transfer case of oil which can result in nasty surprises.

After living with this problem for a few years I had a metal breather made that I connected to a small vented motorcykle brake reservoir in the engine bay so that any access got pushed up into the reservoir and so that I could easily add fluid if needed.

This is what the first breather version looked like.

Image


Image


Image


Image


This setup worked great apart from the o-ring not fully sealing in some conditions due to the built in groove in the breather hole of the transfer case the being too large for the it to seal.

The breather itself was turned, milled and pressed which meant it was pretty time consuming to produce.

So this winter while working on my car I developed a new billet aluminum version of this breather that's made in one piece and press fits into the transfer case breather hole instead.

Here is what the new version looks like:

Image


Image


Image


Image


Image


I haven't started producing these yet apart from for my own use but if there is enough interest I could make a few more of them. So write a post in this thread if your interested in one.
 
#10 ·
Hey robert i'll end up getting one of those and your steering wheel adapter at some point. I'll hit you up on the chat.
 
  • Like
Reactions: Unlogic
#12 ·
I used a portion of the original squishy breather to make a gasket for a barbed 90 degree plastic fitting.

I don't like the press fit design. I think using 2 or 3 orings would give you a seal and be removable. I'd also want shallow grooves or barbs on the outlet so the hose doesn't just slip off one day. Perhaps use your block to set the angle and then instead of the smooth nipple (giggity), use an NPT or SAE port for an off the shelf barbed fitting.
 
#13 ·
The o-ring approach was what I tried first but the grove for the stock breather partially down the hole is very large and messes up the fitment as it likes to intefere with the o-rings on the breather both when installing and removing it.

I didn't make any grooves in the nipple as the silicone hose I had used for the past few years was stuck on there so hard that I almost had to cut it loose. There is no pressure worth mentioning inside the transfer case so a silicone hose with a small spring clamp should not come loose unless it gets physically snagged somewhere.
 
#17 ·
I’ll have to check with Chris to see if the ATX AWD TC uses the same breather as the VR-4 TC’s.
 
#20 ·
For the reservoir I just used one of these generic ones for motorcycles. You can get them at many places:


I use silicone hose on my car but a rubber hose would probably be a better choice as silicone doesn't really like oil in the long run.

I'm planing to sell the fittings for 40$ + shipping (without reservoir and hose).
 
#21 ·
VERY fair price for a quality part....

Thank You for being a part of this community.
Happy Holidays!

Bob.
 
  • Like
Reactions: Unlogic
#27 · (Edited)
The first batch of TC breathers will be done in a few days. The price is 40$ and due to the light weight of the breathers tracked international shipping to most European countries and the US is only 11$.

Send me a message here on 3SI, on Facebook Messenger (Log in or sign up to view) or an email to unlogic@unlogic.se if you want to purchase one and I'll reply with my PayPal address.

PS. If someone also wants to buy a Mitsubishi Colt/Evo steering wheel adapter (Sparco SPX seat install) I can send one of those in the same package without any additional shipping cost.

Image