DIY: Differential Breather Extension

I don't agree w/using gas/misc filter-not needed. I don't have the part #'s but your simply using differnt factory parts to replace what you had a in adittiion to a 6'0 rubber 3/8" hose. I'm sure if you tell a decent Toyota parts department what your doing they willl be able to look up & sell you the screw in piece at the rear diff to attach hose (aprox 6'0) which will end with a stock breather part for the end of the hose. My mechanic & I took out the recessed box located on the bed Drivers side-toward rear of truck located inside bed) drilled 4 holes, wire tied the hose in 2 places (for secure connection over time) and "kept the hose vented in the VERTICAL direction like it is suppose to be done" (just like you viewed it coming off the rear diff originally).
I notice many people mount them sideways. Not correct according to my 30+ mechanic. Good luck. Upgrade to synthetic oil ALL AROUND so you will not have to touch again for a very long time is sugested. If you have limited slip rear diff, I could only find the proper fluid at NAPA at about $16 a quart-discounted price. Note: Front diff, transfer case and engine oil can all be purchased in sythnthetic which is better and long lasting for your vehicle. Try to find all your fluids at Walmart 1st for best price. Good luck.

 

GL, non of the local dealers had the union part. Had to order online with shipping at double the price .

 

Man... Just My luck got called into work yesterday and dealer closed before I could get there.... Guess it'll have to wait till next weekend ..... I am however working on the fog/turning light mod I'm hopping to get it done this week and do a My first write up on it .... I know there's a few out ther but not very detailed to an 02 I've been trying to get tons of pics along the way so I can share.....

 

I was just going to inform you your dealer does not stock those parts; why would they. The manufacturer does recommend you fix their mistake/flaw in design or they may have to pay for it; especially under manufacurer warranty.You found that out already. LOL It is your friendly Forum friends that that give you advice on saving time, money and keep you're vehicle running great.
Thanks to all for the great write ups! Some are confusing to me but once I buy the parts they mention I can always figure out what the techs/do it your selfers are talking about.

 

Quick suggestion here...I had a revelation that instead of using an inline fuel filter I should just use a chainsaw fuel filter, since it attached to the end of the fuel line inside the petrol tank. Only 3 bucks at a parts store. The result after I tightened the hell out of the hose clamp:

It's final place is pulled back into the filler neck covering...I pulled it out for a better view.

 

I dont get what all the "2 way" talk is about. My understanding is that re-using the breather and mounting it in the fuel door is the point, some are just using filters. So where does the 2 way come into play, lol? Oh and btw, I havent looked at the breather yet but from pics it doesnt even look like it could breath, I see no opening... guess I should peek first

 

For 2nd gen Taco's 2005 & up. Don't know about your set up in 03 models.The breather is threaded into the top of the rear diff. You remove that and throw away. There is a threaded insert and a breather that you order at the dealership; very inexpensive. Tell them what you’re doing and they will look up the part #'s (Don't buy a fuel filter like others are stating: not correct,don't need & it is not the proper breathing element).

Breather slides into the end of black rubber hose (approx 6-7 feet long) and tighten it w/hose clamp. Quite sure I used 3/8 hose purchased at NAPA; did awhile back. The breather element should be mounted vertically the same way itcame off the differential; not sideways, vertical, upside down, or 20 ft away under the hood like I have seen on here. I took the driver’s side storage box (furthest 1 to tailgate) out, drilled 4 holes and used 2 plastic zip ties to hold hose properly and securely in the vertical position. Note: Make sure you have the proper size/star type head screwdriver/bit available if you plan on mounting it there.

I think it looks like sh*t when you mount the breather where the gas cap is;not to mention the clamp is sharp, will eventually rust, not mounted vertical which is incorrect and you don't want to potentially cut your finger (someone elses) while removing the gas cap on the medal clamp. Good luck.


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Hey 311,
I just copy & pasted some info for you that I sent someone a few days back along with a bit more info for your questions. The 2nd gen Tacoma's only have a breather on the rear differtial (99.9%) sure. The other individual I believe had a jeep & is confusing Tacoma owwners. The Tundras are set up with a breather extension from factory; not the Tacoma's. Check your vehicle and find out if you need "limited slip" gear lube; my 05 required this; Very important. I switched to full syntheic fluids everywhere possible; you won't have to do it again for a very long time if you spend a little more now. Piece of mind.
Note: Black rubber FUEL line is much more expensive because gas is under high pressure with any type of fuel injected vehicles. Regual black rubber line is fine since it is only for breathing. The rest of your answers are below.

Someone please Send me an email so I know your reading & I'm not wasting my time writing these if you like what you read and it worked for you. Thx. easygoingary@yahoo.com Note in heaader Tacoma Forum. My 05 Tacoma is driven hard on & off road, meticulously maintained and runs like new. Always let your vehicle get to operating temperature before driving hard whether winter or summer they can take a beating and last forever. This has been my experience in other vehicles as well.

PROPER Rear diff mod; parts and modification.

For 2nd gen Taco's 2005 & up. Don't know about your set up in 03 models.The breather is threaded into the top of the rear diff. You remove that andthrow away. There is a threaded insert and a breather that you order at thedealership; very inexpensive. Tell them what you’re doing and they will look upthe part #'s (Don't buy a fuel filter like others are stating: not correct,don't need & it is not a breathing element).

Breather from Toyota slides into the end of black rubber hose (approx 6-7 feet long) andtighten it w/hose clamp. Quite sure I used 3/8 hose purchased at NAPA; did it awhile back. The breather element should be mounted vertically the same way itcame off the differential; not sideways, vertical, upside down, or 20 ft awayunder the hood like I have seen othersdo. I took the driver’s side storage box(furthest 1 to tailgate) out, drilled 4 holes and used 2 plastic zip ties tohold hose properly and securely in the vertical position. Note: Make sure youhave the proper size/star type head screwdriver/bit available if you plan onmounting it there. It is an odd size; my mechanic friend had it.

I think it looks like sh*t when you mount the breather where the gas cap is;not to mention the clamp is sharp, will eventually rust, not mounted verticalwhich is incorrect and you don't want to potentially cut your finger whileremoving the gas cap on the medal clamp. Good luck.

[QUOTE=311offroad;266514]Got some extra time this week, gonna order the parts for the extension. Im wanting to go ahead and get everything that needs to be done though, so do I need to do the tranny, front diff and transfer case? I remember reading a while back that some already have an extension from the factory. Also, do I need the union from toyota for each of them, and is it the same part # for each?

Thanks[/QUOTE]

 

Anyone who hasn't done this mod... click the link in my sig., I show you the parts and the part numbers, plus the install... and as Gary says above... use the correct two way breather that Toyota uses for the front diff. and mine is not mounted in the fuel bay.

 

Did this mod today. I used "union" pn

$8 90404-51319 Toyota Union - 90404-51319

90404-51319 and "breather" pn

$6 90930-03136 Toyota Breather Plug - 90930-03136

90930-03136. Found some 3/8" air hose in Red to match the truck

Union w/ hose attached

I left plenty of slack for flexing, ziptied it to the bed support bracket

Breather in place

 

just relocated mine today but put it into the cab instead of by the filler neck. way less dust i have to worry about getting in and wont get in the way of filling up with gas.

 

I am looking to do this but have seen both, stock breather and misc filter used. Are there more pros to one style? Is it perfectly okay to use a filter of some kind? If this is the case, I am hunting for a part that can easily be plugged when I wash my truck (spray the gas cap area).

Also, are there any special steps regarding the differential locker position? It is mentioned earlier in this thread, but would appreciate some more information.

Thanks

 

By 'stock breather', I hope you mean the same one used on the FRONT diff (ie. a 2-way 'true' breather). DO NOT USE the one that comes on the REAR differential (and put it at the end of the tube)! It is NOT a true breather, but instead a one way VENT (to allow expanding gasses to escape). It does NOTHING to relieve the VACUUM created inside the differential, and THAT is what causes the contamination past the axle seals when you drop into a mud hole or stream.

A breather FILTER is an excellent alternative... as it (like the front diff. breather) allows 2 WAY breathing (expanding gasses out and vacuum relief clean air in).

 

Read my replies on proper install location and part under "garys05tacoma4x4"
1)Use proper Toyota breather. Order 1st; not stocked; very inexpensive.
2) Mount vertically as appropriate; not near gas cap. Looks like sh*t and is proned to get water in, if placed there.
3) Mounting: Take out bed storage basket closets to tailgate on drivers side. Drill 4 holes and wire tie rubber hose twice as an extra precaution and again mount vertically with breather venting from the top/vertical position.
Read my other write up for more detail. garys05tacoma4x4 Good luck.

SAME QUESTION ANSWERED 1,000 TIMES. LOL

 

Thanks David K. I was unaware the breathers were different. I assumed the were all (one way). Thanks for the clarification. I think I am leaning towards the filter,(kinda of a pain to find exactly what I'm looking for lol)

Garys05tacoma4x4 I have viewed your pics. Nice ride. However mine is a 2001 double cab so the basket closets are a no-go. I was thinking about going with the overall theme (gas cap area) but trying to figure out a way to plug it when I wash it. However, I'm sure I will forget to put it on/off, lose the plug, etc. Hmm. Perhaps a plan b is in order for location.

 

So I go my first leak on the 04 taco at 136k miles. Leak is coming from the seals on left and right of the diff and pretty sure the culprit if the smaller breather cap. Trying to figure out if I can mod the small breather and put the larger breather on. The small breather that comes off the front end I could hardly get any air through, larger one was fine. Want to put an adapter of some sort on it and use the larger breather for it instead of the small one. Already bought all the parts to do the rear diff breather mod (ty for the info).

 

does anyone know where the front breather is? i took a look and cant seem too find it

 

alright guys silly question here... but does the relocation inside the gas door get in the way of filling up or closing the door at all?

 

This applies to 2nd generation Tacoma's (05 & up) as to a good breather location. 1st generation Tacoma's. I'm sure you can find a better place than the gas cap area and mount it horizontally so it breathes properly. Only takes plastic wire ties to mount underneath somewhere.
(Copy & pasted from prior post) I don't agree w/using gas/misc filter-not needed. I don't have the part #'s but your simply using differnt factory parts to replace what you had a in adittiion to a 6'0 rubber 3/8" hose. I'm sure if you tell a decent Toyota parts department what your doing they willl be able to look up & sell you the screw in piece at the rear diff to attach hose (aprox 6'0) which will end with a stock breather part for the end of the hose. My mechanic & I took out the recessed box located on the bed Drivers side-toward rear of truck located inside bed) drilled 4 holes, wire tied the hose in 2 places (for secure connection over time) and "kept the hose vented in the VERTICAL direction like it is suppose to be done" (just like you viewed it coming off the rear diff originally).
I notice many people mount them sideways. Not correct according to my 30+ mechanic. Good luck. Upgrade to synthetic oil ALL AROUND so you will not have to touch again for a very long time is sugested. If you have limited slip rear diff, I could only find the proper fluid at NAPA at about $16 a quart-discounted price. Note: Front diff, transfer case and engine oil can all be purchased in sythnthetic which is better and long lasting for your vehicle. Try to find all your fluids at Walmart 1st for best price. Good luck.

 

Not at all.

I have vent cap on now