Mod: Rear Diferential Drain Plug - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 29 (permalink) Old 10-05-2009, 07:49 AM Thread Starter
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Mod: Rear Diferential Drain Plug

Quote:
Originally Posted by Yeggster View Post
I got sidetracked (too busy) and JUST did the gear box oil changes this weekend ... I got the rear axle done on Saturday and the front axle and transfercase Today.

My Commander is a Limited 2006 with QDII, and the original Owner's Manual has the printing error that says to use ATF in the Transfercase, (the online version is corrected)

Mine has never had the fluid changed, I checked the fluid when I drained it out this afternoon and ... the colour, odour, and viscosity was consistent with the proper trafercase lubricant ... it was defiantly NOT ATF fluid.

I have some pics I will post later of a Mod I did too.


Hmmm what kind of mod might you be refering to? It wouldnt have anything to do with extending the breather tubes would it? If so im subscribed!




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post #2 of 29 (permalink) Old 10-05-2009, 10:20 AM
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Mod: Rear Diferential Drain Plug

I thought it would be easier doing gear oil changes with a rear dif drain plug, so when I pulled the cover this weekend I had look, and went to the auto parts, and got what I needed.

I selected "O Ring Boss" style fitting, that one is a simple double ended 'joiner' and a plug ... I cut about 3/8" off with my trusty hacksaw (that allows full thread engagement of the plug) and drew a circle where I wanted to drill the cover



Next use a 1" hole saw and drilled a hole in the cover, it is surprisingly thick at .089" ... thats over two and a quarter millimeters or about 13 gauge steel



Next a quick touch with the file to make it hexagon to match the fitting



Then a quick weld (both sides for strength and leak resistance) and of course some grinding to make sure there no loose weld splatter or slag.



Put in the plug, and a little paint, and bolt it back on, (don't forget Permatex Black RTV Sealant around the cover) winter is coming see the leaves in fall colors all in my driveway



It's a cheap mod .. maybe $12 in parts and should make changing the gear oil next time a little easier!
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post #3 of 29 (permalink) Old 10-05-2009, 10:24 AM
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not bad....It is a little concerning that it sticks so far out from the cover. Typically you would see a socket head bolt with a built up area around it to keep it strong. My though is that it could easily be sheared off with a rock something that happens to get too close. If you do not do much on the rocks then you should be free of any issues. Nice Mod.

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post #4 of 29 (permalink) Old 10-05-2009, 10:25 AM
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Quote:
Originally Posted by 07JeepXK View Post
Hmmm what kind of mod might you be refering to? It wouldnt have anything to do with extending the breather tubes would it? If so im subscribed!
No not that one it probably needs to be done too, I agree the back dif breather tube is kind of short.

The MOD I did is posted here.

https://www.jeepcommander.com/forums/...ad.php?t=10426

Sorry guys fixed link so it points to to actual post

Last edited by Yeggster; 10-05-2009 at 03:42 PM. Reason: fixed link
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post #5 of 29 (permalink) Old 10-05-2009, 10:36 AM
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Quote:
Originally Posted by adamag25 View Post
not bad....It is a little concerning that it sticks so far out from the cover. Typically you would see a socket head bolt with a built up area around it to keep it strong. My though is that it could easily be sheared off with a rock something that happens to get too close. If you do not do much on the rocks then you should be free of any issues. Nice Mod.
Yes i thought of that too ... maybe it's a little deceiving in the pic (I'll see if I can get one from another angle) because it's tucked in pretty close to the bolt circle there ...

I'd say it's safe driving forward, but yes a little more vulnerable than stock if BACKING up on bad rocks ... I'm probably not going to do much rock crawling anyway, but you never know

Here's a pic from the side ... it's tucked up there fairly good I think

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post #6 of 29 (permalink) Old 10-05-2009, 10:54 AM
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Yeggster, pardon my ignorance, but how did you change your diff oil before this mod? I don't do my own service, so I just don't know... and vice versa.
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post #7 of 29 (permalink) Old 10-05-2009, 11:31 AM
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You can just remove the cover. Take out the 10 or 12 bolts and pull it off. I think some may stick a hose in the fill hole and suck it out.
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post #8 of 29 (permalink) Old 10-05-2009, 11:37 AM
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Sorry, but maybe I'm dense... is this an outer cover for extra protection and there is an inner cover with its own drain and fill? I understand how the old oil would spill out but how did you get new oil back in? Is there a fill plug on the actual diff casting separate from the back cover?

Quote:
Originally Posted by jcoulter View Post
You can just remove the cover. Take out the 10 or 12 bolts and pull it off. I think some may stick a hose in the fill hole and suck it out.
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post #9 of 29 (permalink) Old 10-05-2009, 11:50 AM
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Quote:
Originally Posted by GPintheMitten View Post
Yeggster, pardon my ignorance, but how did you change your diff oil before this mod? I don't do my own service, so I just don't know... and vice versa.
Factory approved method is to remove the entire back cover ... scrape off all the RTV sealant, reapply the RTV and replace the cover ... technically you are also supposed to lightly torque the bolts and wait an hour for the RTV to dry then final torque the bolts, then refill.

What they do at the dealers is just suck out most the oil with a suction pump, fill it back up and charge you as though they pulled the cover.

This is actually the first time I changed the gear oil on the Commander
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post #10 of 29 (permalink) Old 10-05-2009, 11:57 AM
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Quote:
Originally Posted by GPintheMitten View Post
Yeggster, pardon my ignorance, but how did you change your diff oil before this mod? I don't do my own service, so I just don't know... and vice versa.
No that's the only cover .. you take it off and all the oil spills out ... there's a rubber-pull-out fill plug to put the new oil in.

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Last edited by Yeggster; 10-05-2009 at 12:27 PM. Reason: spelling
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