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Old 03-21-2014, 05:05 PM   #1
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Cool Trying to change Tranny Fluid

THE JEEP is soon to roll over 150K miles so I am trying to change the tranny oil myself to save $$. I would like to know what size and type of fasteners are used to bolt the skid plate to frame (three fasteners per side). They are a bit rusted and can't determine if they are hex or torx and what I need to remove them.

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Old 03-21-2014, 05:30 PM   #2
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If I recall, they are 19mm external (standard) hex head.

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Old 03-21-2014, 05:32 PM   #3
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Scratch that. 18mm socket fits. I just checked.
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Old 03-21-2014, 05:55 PM   #4
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I thought it was 17mm internal hex?
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Old 03-21-2014, 06:02 PM   #5
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Quote:
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I thought it was 17mm internal hex?
My '99 had standard bolts and I thought the head was 19mm but I just put an 18mm 6pt socket on the factory bolt for my '06. Like a glass slipper.
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Old 03-21-2014, 07:39 PM   #6
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I should have stated that THE JEEP is a '97 Sahara. I suspect that the fasteners changed from model to model. The fitting will have to be an external type, that I can see. Any other thoughts?
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Old 03-21-2014, 07:43 PM   #7
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Maybe you should post a pic if you can. I bet if the heads are so rusted that you can hardly tell what they are, the nutserts in the frame are going to just spin and you are going to be stuck with a whole new project.
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Old 03-21-2014, 08:48 PM   #8
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Is it an auto or manual trans? I changed the fluid on my '99 TJ with 67k miles and manual trans without needing to drop the skid plate. It was not in the way of the drain or fill plugs.

All I needed was ratchet/socket for drain/fill plugs and a cheap $8 fluid pump to pump the fluid in. You can use an empty water jug with the pump. I used Royal Purple Synthetic 75w-90 gear lube. It took about an hour start to finish.
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Old 03-21-2014, 10:23 PM   #9
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Those bolts go into nutserts in the frame. If the head of the bolt is that rusty you might have a surprise waiting for you when you try to drop the skid plate. A lot of time the threaded part of the nutsert gets rusted to the bolt, and the nutsert breaks off at the frame when you try to loosen the bolt and everything just spins.
If you have to drop the skid, I would put it off for a week and soak those bolts inside the frame with some PB Blaster every day for the best chance of getting them apart.
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Old 03-22-2014, 02:15 PM   #10
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I have a Manual tranny and I want to drop the pan in order to change the tranny oil filter. I just received my Redline MT-90 and figured that I should change the filter also. If changing the filter leads to "The Project Without End" (TPWE) I am willing to forgo the filter until I have the time to spare. But, the filter has not been changed in a LONG time.
BTW, the fasteners are possibly 47 six point or 8/9mm hex: Both external for certain.
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Old 03-22-2014, 02:21 PM   #11
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Wait, do you have an automatic or a manual transmission? There is no pan to drop or filter to change on a manual transmission.

If you have an automatic which does have a pan and requires a filter, that MT-90 is the wrong stuff, automatics require ATF+4.
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Old 03-22-2014, 02:31 PM   #12
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Quote:
Originally Posted by UFOtestpilot View Post

My '99 had standard bolts and I thought the head was 19mm but I just put an 18mm 6pt socket on the factory bolt for my '06. Like a glass slipper.
In 2003 they switched to metric. I don't know what size it is before 03. I just know that 03 and after definitely are an 18mm. I found that out after having issues with the nutserts and buying the bolt size for the 2002 and older jeeps haha.

Edit:
97-02 1/2-13 UNC
03-06 M12x1.75
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Old 03-22-2014, 03:36 PM   #13
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Quote:
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In 2003 they switched to metric. I don't know what size it is before 03. I just know that 03 and after definitely are an 18mm. I found that out after having issues with the nutserts and buying the bolt size for the 2002 and older jeeps haha.

Edit:
97-02 1/2-13 UNC
03-06 M12x1.75
I don't know how I messed that up in my original post but I meant to say they're a 12mm bolt.
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Old 03-23-2014, 08:15 AM   #14
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Ah, I think I get the picture now: Yes, it is a manual and thus, no need filter is required. That being the case, my problem is solved. It seems that I averted a TPWE senario for now. Thanks to all. I will now post my next problem.....
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Old 03-24-2014, 12:12 PM   #15
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Quote:
Originally Posted by UFOtestpilot View Post

My '99 had standard bolts and I thought the head was 19mm but I just put an 18mm 6pt socket on the factory bolt for my '06. Like a glass slipper.
Ah that's why. Neither of those are an NV3550
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Old 03-24-2014, 01:03 PM   #16
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Ah, I think I get the picture now: Yes, it is a manual and thus, no need filter is required. That being the case, my problem is solved. It seems that I averted a TPWE senario for now. Thanks to all. I will now post my next problem.....
Good luck! I did my '97 manual without dropping the pan... I just stuffed some cardboard under the drain plug to try to keep the oil from getting all over the skid plate. Of course I bumped the cardboard with my arm and still got it everywhere though I also used Redline MT-90 and it's been running great for a month or so.
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Old 03-24-2014, 01:14 PM   #17
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I cut out a piece of stiff plastic from a Tide laundry detergent jug and shaped it to fit under the drain plug. Worked great and I'll use it again. The transfer case was a bit more of a challenge.
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Old 03-25-2014, 10:21 AM   #18
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I used a 11/16" rod connector for $2.50 and shaved it down to 17mm with a grinder. Worked great. I wasn't trying to pay $50+ for a 17mm internal hex.
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Old 03-27-2014, 12:16 AM   #19
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Just read in the service manual that one of the bolts has a "sealing patch" on it and it's necessary to "replace" it when reinstalling the pan. It says to use "mopar lock and seal adhesive". Is that threadlock? Does anyone do this?
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Old 03-27-2014, 10:20 AM   #20
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I did my 2001 a few weeks ago. And from memory the skidplate is a 1/2" bolt which needs a 3/4" wrench. I pulled the skid, pulled the trans pan and replaced with the deep pan with drain plug, then did the driveway tranny flush. Pretty easy to do. Just remember to put a jack under the trans and remove the 4 nuts in the middle of the skid that connects the trans mount before removing the 6 1/2" bolts holding the skid plate.

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