Rear Differential Breather (1 Viewer)

[BGlynn19]

Has anybody seen this breather before? It's off a 1974 FJ40. I've seen many different kinds but none with a longer thread like this. It goes through the Tee connecting the break lines just to the right of the third member housing. If you have, do you know a Part Number on it by chance?

 

[Rigger]

My '70 has the same piece.

Can't help you with the part number.

 

[sggoat]

It connects to the brake lines?

 

[BGlynn19]

@sggoat please note that this picture isn't mine (google image) but this is basically the same as mine except they are using a hose instead of normal breather.

I don't see this Tee piece on any parts diagrams but if I google it, it defiently appears on other FJ's. I've also found the Tee piece for sale on EBay.

 

[spotcruiser]

I think you can buy one used from SOR.

 

[shawnfj40]

If you are just looking to attach a breather hose to it, the metal cap comes off and a hose can be connected to the barb under it.

 

[bikersmurf]

My July 74 still has them front and rear... standard part. I believe my 77 45 axle even does.

 

[Downey]

90404-10013 Long hose barb fitting
90404-10018 Short hose barb fitting
These are the long threaded and short threaded fittings that have a hose barb, so that you can run a breather hose up to the frame.
90930-03097 is the top breather fitting that has a hose barb instead of threads, you run a hose from bottom hose barb up to this fitting.

 

[73FJ40]

As installed on my rear axle:

 

[MaltbyPenn]

Resurrecting and old thread. I'm installing the ARB differential breathing kit. I have the stock t connection for my brake lines but need to use the hole for the breather.

408655CA-0CEF-413A-8CB4-4D06D712830E.jpeg

• MaltbyPenn
• Feb 21, 2023

Has anyone installed this kit on a 40? What did you do?

I think the option are:

1. Weld the original vent hole shut and drill and tap another hole for the breather.
2. Pull the cap off the original breather, hose clamp on a tube and then splice that tube to the arb tube
3. ???

Is there a special bolt part that holds the brake lines in place and has a 8mm hole for the breather?

 

[Mopdog]

Where does the top end of the hose end up? That seems like a good idea given the condition of the gear oil (chocolate milk) leaking out of my pinion seal. I looked up the kit. That’s fancy.

 

[MaltbyPenn]

There are two hoses, one from the front diff and one from the rear, they join up in a manifold, typically mounted on the fire wall. Here is an amazon link.

 

[Mopdog]

That seems useful. It is also shockingly affordable for having arb on it too.

 

[Mopdog]

Amazon product ASIN B01GSG1YLI
My pile isn’t nice enough for that kit but I have some hose and clamps sitting around so I’ll go this way.

 

[WildernessRimFab]

If you are just looking to attach a breather hose to it, the metal cap comes off and a hose can be connected to the barb under it.

^^This^^
If you arent going 1000% OEM this is a great solution. Run low pressure fuel line from the barb to your engine compartment, add a cheap fuel filter on top of the line.
I have mine next to the heater resistor on the passenger side firewall.

 

[sogncab]

Pulling the cap off seems like an easy enough solution.

I was thinking of have a machinist spin me up new fittings to thread in the push connect fitting into. I don't think there is enough material in the originals to drill them out and tap them.

 

[rkymtnflyfisher]

2

It's easy, and a no brainer.

 

[Mopdog]

Pulling the cap off seems like an easy enough solution.

I was thinking of have a machinist spin me up new fittings to thread in the push connect fitting into. I don't think there is enough material in the originals to drill them out and tap them.

It’s definitely what I’m gonna do. The cap doesn’t keep water out, my fluid change is proof.

 

[sogncab]

It’s definitely what I’m gonna do. The cap doesn’t keep water out, my fluid change is proof.

Might not be coming in through the cap too.

How often are you checking fluids?

 

[jim land]

#3

Take the cap off and weld a nut on the top of the breather