Rear Differential Breather Mod For Dummies

[ds4runner]

[MENTION=105875]96r50[/MENTION]
So you have the arb filter up there and the lines just zip tied to the filler tube supporting the filter or did you secure the filter itself to the filler tube using the filter's self tapping screw holes and zip ties?


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I tried to mount mine with the self tapping screws but they seemed to be too short and wouldn't thread into the inside of my engine bay. I couldn't get it to mount securely, it seemed to be loose. I ended up going to lowes and bought longer screws and mounted it. I ended up w a bunch of extra holes in my engine compartment! Not sure what I was doing wrong but i got frustrated and ended up putting about 4 sets of extra holes in.

 

[Ohio Hawk]

I tried to mount mine with the self tapping screws but they seemed to be too short and wouldn't thread into the inside of my engine bay. I couldn't get it to mount securely, it seemed to be loose. I ended up going to lowes and bought longer screws and mounted it. I ended up w a bunch of extra holes in my engine compartment! Not sure what I was doing wrong but i got frustrated and ended up putting about 4 sets of extra holes in.

I wasn't crazy about drilling extra holes when there were plenty of tapped ones already there. I had a block of 1/2" aluminum milled to accept the breather block and attach to one of the 8mm holes on the fender. I tapped the other 2 holes as 6mm. It was $30.00 for the block, but my local powder coating guy didn't charge me for the coating. Expensive, but no new holes!

 

[ds4runner]

I wasn't crazy about drilling extra holes when there were plenty of tapped ones already there. I had a block of 1/2" aluminum milled to accept the breather block and attach to one of the 8mm holes on the fender. I tapped the other 2 holes as 6mm. It was $30.00 for the block, but my local powder coating guy didn't charge me for the coating. Expensive, but no new holes!

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Clean. I had no patience today and it got the better of me. I'm not too concerned since it's in the engine bay.


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[Ohio Hawk]

Clean. I had no patience today and it got the better of me. I'm not too concerned since it's in the engine bay.


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I hear you about the patience thing. Having 2 small kids, I've learned that mods only happen when time permits. It has slowed me down and now I've gotten used to thinking about how I want to do things, because I usually can't just jump outside and do it.
Living in the Midwest, I see every extra hole as a potential rust point. I probably think about things too much! Either way, your differentials are protected and they thank you!!

 

[Toytrpr]

help

hello all,

Im new to the game all around, first 4x4, first 4runner and today was the first time I went off roading. Have had the car (2016) for about a month and half. I have a basic 4x4 SR5 and stock all around. As the day went by my ego got bigger. There was this puddle, thought I would make it but 10 feet in and I got stuck. Literally. My brother went to get help and was able to flag down T4R TRD. He pulled me out. I was submerged for about 20-30 mins max. the water was at the bottom of the door edge. After I got home my buddy told me to check the REAR DIFFERENTIAL BREATHER, and suggested I might have to get it check out or serviced.

I have 3 questions:

Anyone know anything about these before I modify it?
Do I have to get it replaced or serviced for any damage?
And how long can it be submerged?

 

[Cymon]

hello all,

Im new to the game all around, first 4x4, first 4runner and today was the first time I went off roading. Have had the car (2016) for about a month and half. I have a basic 4x4 SR5 and stock all around. As the day went by my ego got bigger. There was this puddle, thought I would make it but 10 feet in and I got stuck. Literally. My brother went to get help and was able to flag down T4R TRD. He pulled me out. I was submerged for about 20-30 mins max. the water was at the bottom of the door edge. After I got home my buddy told me to check the REAR DIFFERENTIAL BREATHER, and suggested I might have to get it check out or serviced.

I have 3 questions:

Anyone know anything about these before I modify it?
Do I have to get it replaced or serviced for any damage?
And how long can it be submerged?

1. Yes, read this thread all of the way through and search "5th Gen T4r Differential Breather" in google.

2. Yes, get it checked and probably get the fluid drained and replaced ASAP.

3. Depends on a lot of variables, mainly temperature and depth of the water.

Your lucky you didn't hydrolock and need a new engine.

Also read this...

http://www.toyota-4runner.org/5th-gen-t4rs/208458-you-new-prospective-5th-gen-4runner-owner-need-help-searching-start-here.html

Good luck and hope everything works out well.

 

[timelapse]

ARB diff and eLocker breather

Here's how I did mine. I used a universal fitting (the white fitting pictured below) to connect a breather line to the eLocker at the top of the factory run (above the harness). I was able to run two lines to the engine bay with the included 8mm tubing from the ARB kit. I cut it in equal lengths and ended up with just enough to keep enough extra at the rear differential to account for suspension travel. If I did it again I would cut one line 6" longer but I didn't account for connecting to the eLocker up so high when I started the project this afternoon. Sorry about the pictures being oriented sideways.

 

[T4RPXAZ]

Here's how I did mine. I used a universal fitting (the white fitting pictured below) to connect a breather line to the eLocker at the top of the factory run (above the harness). I was able to run two lines to the engine bay with the included 8mm tubing from the ARB kit. I cut it in equal lengths and ended up with just enough to keep enough extra at the rear differential to account for suspension travel. If I did it again I would cut one line 6" longer but I didn't account for connecting to the eLocker up so high when I started the project this afternoon. Sorry about the pictures being oriented sideways.

Could you advise where you got that hose splice fitting? I haven't been able to find a good way to attach my ARB hose to the different diameter hose from the locker breather. Thanks.

 

[engineeer]

I wasn't crazy about drilling extra holes when there were plenty of tapped ones already there. I had a block of 1/2" aluminum milled to accept the breather block and attach to one of the 8mm holes on the fender. I tapped the other 2 holes as 6mm. It was $30.00 for the block, but my local powder coating guy didn't charge me for the coating. Expensive, but no new holes!

View attachment 234057View attachment 234058View attachment 234059View attachment 234060

To clarify, you had a single 8mm diameter countersunk clearance hole to screw the aluminum block into the housing and two other M6 tapped holes for the breather to screw into the block?

 

[timelapse]

Could you advise where you got that hose splice fitting? I haven't been able to find a good way to attach my ARB hose to the different diameter hose from the locker breather. Thanks.

The white fitting is part #47309 vacuum connector. Joins the oem breather above the axle and harness with the ARB 8mm tubing. Picked it up at Autozone.

 

[Ohio Hawk]

To clarify, you had a single 8mm diameter countersunk clearance hole to screw the aluminum block into the housing and two other M6 tapped holes for the breather to screw into the block?

Yes, you are correct if you are using the word housing to refer to the inside part of the fender. The 8mm hole is unthreaded and has a larger hole, made with an end mill so it is flat, about 1/4" deep to accomodate the button head screw I used. I'm including a few more pictures for clarity.

 

[engineeer]

That's really helpful, thanks!

 

[engineeer]

Finally installed mine. I went from the rear differential, up and over the exhaust (over the heat shield) and zip tied it along a cable that runs on the passenger side from the rear door all the way up just inside of the passenger front wheel well and up into the engine bay.

Differential side of the tube:

Mounted the breather in the engine bay, driver's side between the fuse box and firewall. Left some extra tubing in case I want to relocate it later:

This is about as much as I could tighten the disc onto the bracket without stripping the screw:

 

[SATSTRAIL]

I am right in the middle of this mod. I've installed the rear diff breather and run the line just like the OP.

Why has no one mentioned extending the front differential's tube? Is that not a thing? Am I missing something?

Though I have not read through this entire thread I'm guessing the reason being is because since the vehicle has independent front suspension no matter how much you lift the vehicle the front differential, being mounted to the frame, always stays in the same place therefore no need to lengthen the breather hose from stock. The rear is a different story due to it being a solid axle. When you lift it in the rear this will always increase the distance between the differential and the body where the end of the breather is mounted.

 

[AAK625]

sdfsdfsdf

 

[SATSTRAIL]

Gotcha. If I remember correctly from looking at my truck I believe the front differential, the transmission and the transfer case all have extended breather hoses that reach up into the engine compartment area well above the differential level. The oddball on this vehicle is that the rear differential in stock format has simply a little breather cap mounted directly on the differential thus the need for the extension hose to put it up much higher. It doesn't make sense why they did this… unless you're planning on turning your truck into a submarine the stock location for the front diff breather should be pretty good.

 

[sting555]

Though I have not read through this entire thread I'm guessing the reason being is because since the vehicle has independent front suspension no matter how much you lift the vehicle the front differential, being mounted to the frame, always stays in the same place therefore no need to lengthen the breather hose from stock. The rear is a different story due to it being a solid axle. When you lift it in the rear this will always increase the distance between the differential and the body where the end of the breather is mounted.

The front diff and transmission/transfer case breathers are already routed up inside the engine bay from the factory. The rear diff breather (and e-locker; if applicable) do need to be modded if any deep water crossing is going to be done.

I took a stock 2015 SR5 through a fairly deep water crossing (water was over the top of the tires) and got water in the rear diff. The front diff was fine with the factory breather.

Better safe than sorry. This is an inexpensive and easy mod and worth every penny.

 

[SATSTRAIL]

Exactly the explanation I was looking for. Thanks Sting.

I thought that's what I just said?… LOL!

Gotcha. If I remember correctly from looking at my truck I believe the front differential, the transmission and the transfer case all have extended breather hoses that reach up into the engine compartment area well above the differential level. The oddball on this vehicle is that the rear differential in stock format has simply a little breather cap mounted directly on the differential thus the need for the extension hose to put it up much higher. It doesn't make sense why they did this… unless you're planning on turning your truck into a submarine the stock location for the front diff breather should be pretty good.

 

[Cymon]

[MENTION=160911]AAK625[/MENTION] exactly what [MENTION=44369]sting555[/MENTION]

 

[eyezlee]

I fabbed a little bracket and used the factory hole in the fender. 8mm bolt to the fender and 2 6mm bolts through the filter block.

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