Transmission & Transfer Case Fluid Change (& Best Tool For Oil Drain Plug) - Jeep Wrangler Forum
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Old 06-21-2019, 02:59 PM
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Transmission & Transfer Case Fluid Change (& Best Tool For Oil Drain Plug)

As we all know, the drain plug on the JK is a pain to get to so just as a Jedi must build his own light saber, you must build your own tool Daniel son. I made mine from combining an old adjustable wrench & the tip from a 17mm hex socket. Turns out the adjustable wrench is no longer made...makes sense as I bought it years ago and never found a use for it till now

  1. GM Goodwrench, Part Number 16907 https://www.ebay.com/p/Vintage-GM-Go...d=223502420089
  2. Harbor Freight Hex Socket Set, Part Number 67880 https://www.harborfreight.com/9-piec...set-67880.html


I got the harbor freight set for $14, figured why not get a whole set for less than what it would cost for a single tool. So you have to remove the allen part out of the socket. In order to do so, I cut a slit down the casing for easy release & popped out the allen bit with a hammer and the end of a file.




And voila, ya got yourself the perfect drain plug tool:
https://imgur.com/y63lBBe

I only had about 1-3/4" (or 44.5mm for ya non freedom unit users) of clearance from the exhaust and plug

https://imgur.com/JexQ2ed

But my lightsaber tool had plenty of clearance
https://imgur.com/tJf9cKr

The rest is pretty much removing nuts, draining fluids & pumping more fluids and is covered extensively throughout this forum and others:

Tools for the job:
https://imgur.com/YgaqH9W

The job:
https://imgur.com/i4OjDv8

And here's my rig to hold up the heavy transfer case skid plate. Made from beer cartons bungeed to a toolbox, perfect height & very manly
https://imgur.com/Wj12oHf

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Old 06-21-2019, 11:51 PM   #2
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Thanks for taking the time to take and post those detailed pics.

You probably already know this but just draining the trans fluid and refilling it only gets rid of about half of the old fluid that's in the system. My owner's manual doesn't call for a trans fluid and filter change until 120k miles, although I had the dealer do a flush and fill once already at 45k miles. They will also be doing the filter change when it reaches 120k. Too much mess for me.

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Old 06-22-2019, 01:20 AM   #3
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Thanks for taking the time to take and post those detailed pics.

You probably already know this but just draining the trans fluid and refilling it only gets rid of about half of the old fluid that's in the system. My owner's manual doesn't call for a trans fluid and filter change until 120k miles, although I had the dealer do a flush and fill once already at 45k miles. They will also be doing the filter change when it reaches 120k. Too much mess for me.
Pretty sure the OP has a manual and you're talking about an automatic.
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Old 06-22-2019, 11:32 PM   #4
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Does not have to be messy

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.......... Too much mess for me.
I did exactly the same thing using Harbor Freight tools. It works really well using a ratchet tool the same size as the allen section. That keeps the profile at a minimum.



A lot of the mess...and associated hassle... has to do with the fluid coating the exhaust pipe while it is draining. To counter this, and make for an easy cleanup, I cover the exhaust with aluminum foil making a pathway for the draining fluid into my collection container. Cleanup is simply removing and discarding the aluminum foil with no residual mess.


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Old 06-23-2019, 03:31 AM   #5
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I had the 14 and 17 hexes, so I ended up loosening clamps on exhaust and pivoting out of the way. A touch extra work. But I like your idea.
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Old 06-25-2019, 07:51 AM
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Yup, manual transmission here. I should’ve mentioned earlier, thanks for pointing that out
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Old 06-25-2019, 08:02 AM   #7
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To counter this, and make for an easy cleanup, I cover the exhaust with aluminum foil making a pathway for the draining fluid into my collection container. e
I tried that and still made a mess....
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Old 06-25-2019, 08:03 AM   #8
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And here's my rig to hold up the heavy transfer case skid plate. Made from beer cartons bungeed to a toolbox, perfect height & very manly
Very elegant and high tech.....
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Old 06-25-2019, 03:53 PM   #9
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BIG MESS (averted)

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I tried that and still made a mess....
I can certainly relate to that. My first time even using the foil was also a MESS! That is when I revised the way I configure the aluminum foil. The secret is to make sure the fluid has a LARGE/W I D E pathway (without ripples) to the collection bucket!

As an alternate pathway, the foil can be made into a "pipe" of sorts (with a wide sloping elbow) so that it does not splash/spill. It does flow pretty fast so one has to be careful!

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Old 06-26-2019, 01:40 PM   #10
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Very elegant and high tech.....
Funny thing is, those cartons are stupid strong in that particular direction of force.

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