ObsidianBl

I haven’t seen any posts regarding rear diff breathers. Is this necessary for the GX, similar to the other Toyota suvs and trucks? I remember seeing this pop up on the 5th gen 4Runner forums.

I don’t have any current plans to go all out modifying the GX... yet. This may be useful for those that are heavily modifying the vehicles.

http://www.toyota-4runner.org/5th-ge...-complete.html

http://www.toyota-4runner.org/5th-ge...d-dummies.html

Acrad

Good thread to start....

I posted a few hits in this thread as well

https://www.clublexus.com/forums/gx-...ing-depth.html

Acrad

I'll have to check on mine. Prado 150 forums claim stock rear diff vent is piped up somewhere near the fuel filler door area.

ObsidianBl

How did I miss that thread? It was fairly recent too. Good info there as well.

Jacket

There's a breather vent on the top of the rear diff (offset to the driver side IIRC) but it's not routed up high in stock form. Pretty simple mod to add some tubing and extend the breather up to the rear control arm or following the fuel tank filler tube (that's what I did on my 80).

Edit: This is the part I used on my old Tacoma which I bet would still work with the GX: 90404-51319. Install it on the diff, then some 3/8" fuel line up to a high spot, then the breather vent on the top. You could re-use the vent on your axle right now, or buy a new one.

Acrad

I might extend that one at least. Launching my boat on a beach always the chance I could get water near that vent.

Jacket

Front diff breather is already extended up next to the fuse block.

ObsidianBl

Here’s some more info from a GXOR member who did the rear diff mod

https://m.facebook.com/groups/838842...omment_mention

Acrad

I've seen some bring the extended breather up into the gas filler area as well.

Jacket

That's what I did for my 80.

ObsidianBl

3/8” or 5/16” Fuel hoses shouldn’t make a difference, right? I’ll order the parts online. Currently, don’t feel like making runs out into the world if I don’t need to.

Acrad

I've seen both fuel hose sizes used on the 4R forums.

I think the following recommends 5/16"

PN: 90404-51319



PN: 90930-03136




Transmission & Transfer Case breathers apparently terminate up against the firewall behind engine somewhere.

Acrad

Front diff stock breather

https://parts.lexus.com/a/Lexus__GX-...2410-4301.html

Acrad

Breather plug for rear diff

PN: 9093003031

42110C in diagram

Acrad

I am going to do a breather extension for rear diff to gas tank fill area.... I think 3/8" tubing

PN: 90930-03136



PN: 90404-51319