Rear Diff Breather Mod - Complete!

[Yinzer]

I assure you this doesn't & will not leak, no compromise here!

Thanks Saker, do you think there is enough meat on that plug to punch two holes? I have a TRD OffRoad so I want to run a dedicated line for the E-locker.

 

[Saker]

Thanks Saker, do you think there is enough meat on that plug to punch two holes? I have a TRD OffRoad so I want to run a dedicated line for the E-locker.

You are welcome.

write the part # down before you punch any holes in case you need to purchase a replacement.

There may be enough room for 2 holes, but is not necessary.
You can put a T in the line, join them together and run 1 hose to your desired location of preference.

 

[Slycops]

Rear diff fluid change?

Stumbled across this thread after recently submerging the rear axle in some muddy waters. The diff had been splashed with several water crossings a few minutes prior but the last was a complete submersion.

Wondering if changing the rear diff fluid is recommended? Thanks to this site I found a thread and it's pretty easy to do. And should it be done right away or can I wait a couple months?

Thanks for any reply

 

[e60ral]

Stumbled across this thread after recently submerging the rear axle in some muddy waters. The diff had been splashed with several water crossings a few minutes prior but the last was a complete submersion.

Wondering if changing the rear diff fluid is recommended? Thanks to this site I found a thread and it's pretty easy to do. And should it be done right away or can I wait a couple months?

Thanks for any reply

just inspect it, but i doubt one water crossing did anything

i went ahead and replaced mine at 30k miles since i had a credit at the dealership, it looked fine and i've had loads of water crossings

 

[Slycops]

just inspect it, but i doubt one water crossing did anything

i went ahead and replaced mine at 30k miles since i had a credit at the dealership, it looked fine and i've had loads of water crossings

Thanks for the reply, e60ral... trying to balance the err with caution vs making a mountain out of it. Haven't even rolled 3k yet but learning a lot quickly

 

[Sleeter]

Stumbled across this thread after recently submerging the rear axle in some muddy waters. The diff had been splashed with several water crossings a few minutes prior but the last was a complete submersion.

Wondering if changing the rear diff fluid is recommended? Thanks to this site I found a thread and it's pretty easy to do. And should it be done right away or can I wait a couple months?

Thanks for any reply

I did at least 30 water crossings before I installed the breather, some of which were way over the diff. I had zero signs of water in the differential. If you're really worried you can check the fluid and see if it shows signs of water infiltration (milky).

 

[Slycops]

I did at least 30 water crossings before I installed the breather, some of which were way over the diff. I had zero signs of water in the differential. If you're really worried you can check the fluid and see if it shows signs of water infiltration (milky).

Good to know. I'll probably do the breather and leave the fluid change for a couple months down the road. Just like you I had water that was up over my rear bumper, still trying to clean the mud off!

Thanks for sharing your experience, Sleeter!

 

[4OYOTER]

Has anyone just simply routed their breather right inside one of these grommets? This looks to basically go to an empty compartment right below the jack compartment. It would be closed off from dirt or dust and save on the hose length needed to get into the fuel door or other areas. It is partially sealed from the interior, so hopefully no fumes. My only question would be how much "fresh air" the breather would need? (I have the two way breather). Should this litttle compartment be ok ?

 

[Off2Mtns]

Installed my rear diff breather over the weekend. Thanks to many of you for posting your DIY experiences in this thread and others. I especially found a couple posts by [MENTION=55815]Okki[/MENTION] helpful:

Various axle unions: http://www.toyota-4runner.org/5th-gen-t4rs/114057-breather-mod-all-tied-into-one.html#post1053777

Looks like that was originally from Sonoran Steel’s site:

And his DIY rear diff breather job w/ BOM… http://www.toyota-4runner.org/5th-gen-t4rs/94578-okkis-build-thread-4.html#post1073310

Here is my Bill of Materials (BOM):

90404-51026 Union: $6 at local Toyota dealer

100561 5/8” Hose clamp: Everbilt 5/8 in. Stainless-Steel Clamp-6260294 - The Home Depot

3JT63 25 ft pneumatic air hose: https://www.grainger.com/product/SPEEDAIRE-25-ft-Air-Hose-3JT63?searchBar=true&searchQuery=3jt63

1EJW7 Pneumatic silencer muffler: https://www.grainger.com/product/SP...uffler-1EJW7?searchBar=true&searchQuery=1ejw7

Other misc pieces: Alum angle bracket, a couple M8 screws, zip ties

Total cost, about $40

The air hose is basically equivalent construction and cost of fuel line but with the benefit of the end fittings.

Basically followed the fuel and brakelines to the engine bay. 12’ was JUST enough length.

Forgot to snap a shot while I had the fender liner out of the way…

Used a piece of 16ga aluminum angle to make a quick mounting bracket. I thought the silencer muffler made for a perfect breather cap.

If I were to do it again I’d probably just buy the ARB kit for $70 online and spared a couple days of researching and running to three different stores for parts to “save” $20-$30, but in the end I think I ended up with a bit more durable kit anyway.

 

[Cr4zy4runner]

Does anyone have updated images from the install into gas cap compartment and how to access it? The pictures form the third party host are no longer showing up... I will attempt go in blind just by write up if not no worries.

 

[DesertCanyons]

Diff and E-Locker breather

Does anyone have updated images from the install into gas cap compartment and how to access it? The pictures form the third party host are no longer showing up... I will attempt go in blind just by write up if not no worries.

Here is my thread with good photos of where to run the line. I found a better, higher place to run the air line into the jack compartment.

http://www.toyota-4runner.org/5th-g...ferential-breather-install-trail-edition.html

 

[2016 4Runner SR5]

My turn. I have more pictures but the forum only allows 8 at a time so

 

[gdvan01]

My turn. I have more pictures but the forum only allows 8 at a time so

Has anyone caught a wiff of the diff fluid inside the vehicle as a result of running the breather up into the jack compartment?

 

[2016 4Runner SR5]

Has anyone caught a wiff of the diff fluid inside the vehicle as a result of running the breather up into the jack compartment?

No one that I have seen that's why I did it. I had the same fear and this fear has been brought up many times but everyone says no. Easy to move if you decide you don't want it there.

 

[mcox522]

Has anyone caught a wiff of the diff fluid inside the vehicle as a result of running the breather up into the jack compartment?

I did, only when I had the recirculating air on though. It seemed to go away after I replaced my cabin filter

Sent from my ONEPLUS A3000 using Tapatalk

 

[Nick B]

Old thread but I'm tagging it for future reference .

 

[AdventureMan]

I actually did a slight variation on what other folks did. I routed the diff and e-locker breathers up on top of the fuel filler pipe all the way to the area just behind the fuel filler chamber, up at the top of the left rear wheel well. I didn't feel comfortable cutting up the rubber and plastic that is supposed to keep the "outside water" from becoming the "inside water", but I wanted it to be as high as possible. This part of the wheel well is covered by a plastic splash shield, and the area actually seems to be a lot cleaner than under the fuel filler door. It did take some fanagling with a small 12-point socket (I think it was around 10mm) to release the plastic panel clips from behind.

You unclip the splash shield, run the breather tubes up along the filler pipe as high as they will go, secure with zip-ties, then button the splash shield back on.

 

[gdvan01]

I actually did a slight variation on what other folks did. I routed the diff and e-locker breathers up on top of the fuel filler pipe all the way to the area just behind the fuel filler chamber, up at the top of the left rear wheel well. I didn't feel comfortable cutting up the rubber and plastic that is supposed to keep the "outside water" from becoming the "inside water", but I wanted it to be as high as possible. This part of the wheel well is covered by a plastic splash shield, and the area actually seems to be a lot cleaner than under the fuel filler door. It did take some fanagling with a small 12-point socket (I think it was around 10mm) to release the plastic panel clips from behind.

You unclip the splash shield, run the breather tubes up along the filler pipe as high as they will go, secure with zip-ties, then button the splash shield back on.

Nicely done.

 

[Gyprat]

Can anyone tell me what thread size is on the factory installed rear diff breather? I want to get a hose barb fitting of the same size.

I'm surprised that Toyota did not relocate the breather to a "higher ground". My old 98 Grand Cherokee has breather tubes for both axles, transmission and the transfer case relocated to keep water out of the axles. I have done a lot of deep water crossings without any issues. Several spots were at least 2 ft deep.

 

[Saker]

Can anyone tell me what thread size is on the factory installed rear diff breather? I want to get a hose barb fitting of the same size.

I'm surprised that Toyota did not relocate the breather to a "higher ground". My old 98 Grand Cherokee has breather tubes for both axles, transmission and the transfer case relocated to keep water out of the axles. I have done a lot of deep water crossings without any issues. Several spots were at least 2 ft deep.

[MENTION=133871]Gyprat[/MENTION]

Please look 10 posts up to find your answer.
Hint: it’s metric.