Rear diff breather question

[smerhej]

Hey all,

I noticed the rear diff breather on my 00' was a bit dirty, so I bought a new OEM one and installed it today. Thing is I noticed the installed breather had some thread left - when I installed the new one I just screwed it flush into the diff.

Is there a reason you'd leave some space? I'm assuming the washer is where it is for a reason but just wanted some reassurance.

Thanks in advance!

 

[pluton]

Is the new breather the same part as the old one? Is it the 'one way' type thats seems to be original OEM on these trucks?
Before I replaced then original breather with a hose barb for the extension, I never noticed whether or not my original breather was 'backed out' when it was attached. But...If the replacement is nice and snug, I doubt there is any cause for concern.

 

[JRZEE2000TR4LTD]

Hey all,

I noticed the rear diff breather on my 00' was a bit dirty, so I bought a new OEM one and installed it today. Thing is I noticed the installed breather had some thread left - when I installed the new one I just screwed it flush into the diff.

Is there a reason you'd leave some space? I'm assuming the washer is where it is for a reason but just wanted some reassurance.

Thanks in advance!

Those fittings are a tapered fit. The original one may have had more taper to it then the replacement or the replacement was machined wrong. Still shouldn't back out though. If you think it will, put some teflon tape on it or a little blue loctite. The tape should do the trick though.

 

[smerhej]

Is the new breather the same part as the old one? Is it the 'one way' type thats seems to be original OEM on these trucks?
Before I replaced then original breather with a hose barb for the extension, I never noticed whether or not my original breather was 'backed out' when it was attached. But...If the replacement is nice and snug, I doubt there is any cause for concern.

It should be! I got it directly from a dealer using my VIN.

Yeah I noticed when I pulled the old breather the first few threads after the tightening nut had a ton of rust so it must of been exposed.

 

[smerhej]

Those fittings are a tapered fit. The original one may have had more taper to it then the replacement or the replacement was machined wrong. Still shouldn't back out though. If you think it will, put some teflon tape on it or a little blue loctite. The tape should do the trick though.

The nut is snug against the diff and it required a bit of muscle to get it there, so it hopefully doesn't go anywhere. But I'll check on it every now and then and keep your solution in-mind. Thanks!

 

[Kanoe]

it required a bit of muscle to get it there

There is your answer for you.

These are a thin walled hollow bolt and do not need a lot of torque to put them in. I do not know a torque value. If you put a wrap or 2 of teflon tape on it and used some restraint on the wrench it likely would have sat a little proud of the surface like the old one.

Yours will not fall out. This part is not going to be subject to any vibration, I'd just forget about it and consider it done.

 

[raKnizek]

It certainly wont go anywhere but should they not be concerned with it leaking? I wouldn't submerge the diff w the stock breather anyway but you never know..

 

[mtbtim]

Maybe consider the Rear Differential Extended Breather Mod.

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[phattyduck]

The nut is snug against the diff and it required a bit of muscle to get it there, so it hopefully doesn't go anywhere. But I'll check on it every now and then and keep your solution in-mind. Thanks!

Correct torque on the breather is probably 10 ft-lbs or less with a small dab of thread sealant, locktite or thread tape. They are tapered threads and there should ALWAYS be threads showing when tightening is completed. You can crack the fitting or housing (unlikely in this case, as it is case iron...) if you over tighten.

-Charlie