Transfer case breather

Foureigner · 09-18-2009, 02:03 AM

During some research on the extension of the rear differential breather, I came across a lot of questions on a (possible) transfer case breather (with or without extension), but could not find any answers.

This afternoon I made some effort and found the breather, which looks the same as the one on the rear diff (also not extended); see picture.
Anybody experience with extending this breather? how long should the hose be to run it up to the engine compartment (next to the front diff extension)?

During my search I encountered a small hose that was worn and needs replacement (ductaped a for now). According to the repair manual it is a so-called breather hose that runs between the transmission side and transfer side. (see attachment). Anybody a recommendation what material to use for replacement? (size, length)?
What is the function of this breather hose?

Thanks in advance,

Sieb

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drew303 · 09-18-2009, 03:27 AM

find the same size vac hose at your local auto parts store. As for the function, specifically I'm not certain what the engineers had/have in mind on that newer stuff. I'd imagine its to vent pressure between the Tran/Tcase to keep them equal.. a breather (as you found at the top) is designed to allow pressure out easily but not so easily in but not sure about the hose... something new i guess

drew303 · 09-18-2009, 03:29 AM

unless only one case is truely vented... then they put the hose in place to allow for only one breather vent?

dunno..

Foureigner · 09-27-2009, 03:18 AM

I think you are right; the hose functions as a breather for the transmission side through the transfer breather.

The hose was torn and I found the hose of kind of an inferieur material, if you think it needs to function as a breather and keep water and dirt out of the transmission and transfer case. It does not have a clamps, but just sits and the two nipples.

I replaced it with a much thicker and stronger hose and used clamps to secure. I think it is worthwhile checking.
See attached picture.

I am still wondering if anybody has extended the breather?

Thanks,
Sieb

awpsome · 09-28-2009, 01:28 AM

sorry noob question but kinda on the same topic and id thought id post here.
does extending the rear diff breather do anything? other then help so water doesnt go in when you go roading and all taht?
i mean please dont flame my question just out of curiousity if it does anything else.. power? smoother? haha thanks

KZN185W · 09-28-2009, 04:01 AM

just preventing water/mud from getting into the diff.. no performance increase

Ron Helmuth · 10-10-2009, 07:50 PM

Quote:

Originally Posted by awpsome

sorry noob question but kinda on the same topic and id thought id post here.
does extending the rear diff breather do anything? other then help so water doesnt go in when you go roading and all taht?
i mean please dont flame my question just out of curiousity if it does anything else.. power? smoother? haha thanks

some have suggested that extending the diff breather to a cleaner location higher up on the body helps the pressure within the diff and extending life of the seals.

Not sure all that is true, but it's cheap insurance for some tubing and a vent and 15 minutes of time. I did it and it was piece of cake.

Foureigner · 10-16-2009, 09:54 PM

What do you guys think of the solution used by a FJ cruiser owner for the differential breather and the transfer breather?
http://www.fjcruiserforums.com/forum...ather-mod.html

Ron Helmuth · 11-07-2009, 07:14 AM

I like the general premise Foureigner-tie into existing breather lines and so on.

but not certain how much of that is applicable to a 3rd gen Runner

09-18-2009, 03:27 AM	#2 (permalink)
drew303 Registered User Join Date: Dec 2006 Location: Olympia, WA Posts: 2,032	find the same size vac hose at your local auto parts store. As for the function, specifically I'm not certain what the engineers had/have in mind on that newer stuff. I'd imagine its to vent pressure between the Tran/Tcase to keep them equal.. a breather (as you found at the top) is designed to allow pressure out easily but not so easily in but not sure about the hose... something new i guess __________________ 1987 Pickup, single cab, 22R, new head, 260 cam TG 3" SAS, rear disc brakes, chromoly rear axles, Chromoly Birfs, Tcase brake, 37x12.50R15 MT/Rs, 5.29 gears, rear Aussie Locker, front Detroit Truetrac.

09-18-2009, 03:29 AM	#3 (permalink)
drew303 Registered User Join Date: Dec 2006 Location: Olympia, WA Posts: 2,032	unless only one case is truely vented... then they put the hose in place to allow for only one breather vent? dunno.. __________________ 1987 Pickup, single cab, 22R, new head, 260 cam TG 3" SAS, rear disc brakes, chromoly rear axles, Chromoly Birfs, Tcase brake, 37x12.50R15 MT/Rs, 5.29 gears, rear Aussie Locker, front Detroit Truetrac.

09-27-2009, 03:18 AM	#4 (permalink)
Foureigner Registered User Join Date: Sep 2009 Location: Ulaanbaatar, Mongolia Posts: 5	Transfer case breather I think you are right; the hose functions as a breather for the transmission side through the transfer breather. The hose was torn and I found the hose of kind of an inferieur material, if you think it needs to function as a breather and keep water and dirt out of the transmission and transfer case. It does not have a clamps, but just sits and the two nipples. I replaced it with a much thicker and stronger hose and used clamps to secure. I think it is worthwhile checking. See attached picture. I am still wondering if anybody has extended the breather? Thanks, Sieb Attached Thumbnails __________________ 4Runner Canadian Base Model; 2.7L; 4WD; Manual Transmission; 2002. Engine: 3RZ-FE

09-28-2009, 04:01 AM	#6 (permalink)
KZN185W Registered User Join Date: Mar 2004 Posts: 692	just preventing water/mud from getting into the diff.. no performance increase __________________ 1996 Pearl White Hilux Surf KZN185W SSR-G l 3.0L TDI l Dual Battery l LT285/75R16 l Recaro Seats Drive Your Dreams

10-16-2009, 09:54 PM	#8 (permalink)
Foureigner Registered User Join Date: Sep 2009 Location: Ulaanbaatar, Mongolia Posts: 5	What do you guys think of the solution used by a FJ cruiser owner for the differential breather and the transfer breather? http://www.fjcruiserforums.com/forum...ather-mod.html __________________ 4Runner Canadian Base Model; 2.7L; 4WD; Manual Transmission; 2002. Engine: 3RZ-FE

09-28-2009, 01:28 AM	#5 (permalink)
awpsome Registered User Join Date: Jan 2009 Posts: 73	sorry noob question but kinda on the same topic and id thought id post here. does extending the rear diff breather do anything? other then help so water doesnt go in when you go roading and all taht? i mean please dont flame my question just out of curiousity if it does anything else.. power? smoother? haha thanks

11-07-2009, 07:14 AM	#9 (permalink)
Ron Helmuth Registered User Join Date: May 2007 Location: Denver metro area-CO Posts: 1,339	I like the general premise Foureigner-tie into existing breather lines and so on. but not certain how much of that is applicable to a 3rd gen Runner

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