Toyota MinutesMods on 4x4Wire

Toyota Tech: Shock Specifications

Welcome to 4x4Wire! You, your 4x4, and Access... Short Cuts
More on 4x4Wire: 4x4 Tech | 4x4 Reviews | Destinations | 4x4 Access
More 4x4 Tech 4x4Wire: Jeep Tech | Jeep Projects | Jeep News | Jeep Reviews | Jeep Gallery
Toyota FAQ | Toyota Projects | Toyota Maintenance | Toyota 4Runner | Toyota Tech | Hot Toy | Insider
Mitsubishi on 4x4Wire | Mitsubishi Projects | Mitsubishi Reviews | Mitsubishi Tech
Intro | Isuzu News | Isuzu Tech | Isuzu Events | 4x4Wire Gallery

A differential breather is a vent to the outside air, covered by a cap that helps keep debris out. This breather is usually in the top of the axle housing, above the differential. The breather is necessary to relieve pressure in the axle housing caused by temperature changes. Without a breather, or if your breather is clogged, the pressure that builds up inside the axle housing will most likely push gear oil past your pinion or axle seals.

Since the breathers are located right on the axle housing, it is possible that they could be submerged if you were crossing a creek, deep puddle, or mud hole. The potential for a problem arises when you submerge the axle for more than a few seconds. The temperature inside the axle drops which causes the pressure inside the axle to also drop. This pulls whatever is on the other end of your differential breather into the axle housing. If you're axle is under water, it will be pulling in water. If you've pulled in water, you need to chage the gear oil soon, or down the road you'll most likely be looking at some damage.

By raising the point at which the breather draws in air you can significantly reduce the possibility of getting water in your axle. This is commonly called an 'extended breather.' One easy method of creating extended breathers is to attach a vacuum hose or fuel line to the breather, and route the other end of the hose to a high location in the vehicle. On my vehicle I have routed my breathers to the top of my engine compartment.

Inexpensive breather fitting
Inexpensive breather fitting

The stock Toyota differential breather leaves very little room to attach a hose once the breather cap is pulled off. There are a couple of other fittings that can be used to replace the stock differential breather, each with a long stem that you could easily secure a hose to. There is a fitting on the Toyota 4 cylinder intake manifold that will serve this purpose well, but if you have to buy the fitting new, there is a cheaper alternative.

There is a Nissan breather that fits perfectly into the threads that our stock Toyota breathers use (except Land Cruisers). The Nissan part number is 38323-C6010. I was charged $4.50/each for the breathers I purchased. The picture on the left is what the nissan part looks like sitting in the top of the Toyota differential housing.

Rubber hose breather line
Rubber hose breather line

To extend my breathers I used is 7/32" vacuum hose, available at most auto parts stores. To make sure the hose does not ever come off of the breather fitting I also clamped it down with a very small hose clamp. These should also be available at most auto parts stores. Here is a picture of the finished product.

Related Links

Trending on 4x4Wire TrailTalk Forums

New Topics on TrailTalk
Gen 1 Trailer Hitch and Owners Manuals
by Kookster97 - 06/17/22 12:37 AM
Gen 2 UCA extended upper ball joints?
by Colombia - 05/24/22 03:28 AM
Blown Head Gasket - could use advice
by Runner-Man - 05/23/22 01:58 AM
suzi the psychic
by - 03/26/10 06:59 AM
Recent Posts on TrailTalk
Gen 1 Trailer Hitch and Owners Manuals
by Kookster97 - 06/28/22 01:34 PM
Gen 2 UCA extended upper ball joints?
by Mudraider - 06/15/22 07:00 PM
suzi the psychic
by rascott - 06/14/22 01:47 AM
Blown Head Gasket - could use advice
by Snowtoy - 05/30/22 06:11 AM

4x4Wire Social:

| 4x4Wire on FaceBook

OutdoorWire, 4x4Wire, JeepWire, TrailTalk, MUIRNet-News, and 4x4Voice are all trademarks and publications of OutdoorWire, Inc. and MUIRNet Consulting.
Copyright (c) 1999-2019 OutdoorWire, Inc and MUIRNet Consulting - All Rights Reserved, no part of this publication may be reproduced in any form without express written permission
You may link freely to this site, but no further use is allowed without the express written permission of the owner of this material.
All corporate trademarks are the property of their respective owners.