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Old 01-22-2020, 05:55 PM
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Transfer case lube change question

Want to do the above, checked some YouTubes on it, and it looks like they drop the skid plate. Is this necessary? Looks like the drain is over the skid, but could a drain diversion be made?

If I pull the skid, I see some bolts that look like they support the trans, is that a problem? I probably should pull it, its full of dirt, leaves, sticks, etc, and clean it.

I did the Trans fluid a while back, when back in with 10w-30 synthetic oil. Couldn't tell any difference (which is a good thing). The oil coming out was surprisingly clean, still had some yellow. I repurposed it for chainsaw bar/chain oil.

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Old 01-22-2020, 08:56 PM   #2
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TC uses simple tranny fluid.
NP-231 2.2 pints ATF+ or Dexron II
NP-241 4.2 pints ATF+4

Be best to drop the skid plate, be sure to use some Kroil/LiquidWrench/PBlaster/ect for a day or two prior and do not gorilla the bolts if they don't want to come out.

You will need to have the tailstock of the tranny on a jack and remove the mount bolts under it that go through the skidplate before lowering the plate.

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Old 01-23-2020, 07:24 AM   #3
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I change mine without dropping the plate. It can be a little more messy if you don't take precautions.
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Old 01-23-2020, 07:37 AM   #4
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You definitely don't need to drop the skid unless you have excess time and just want to. You could probably fit a small funnel with a piece of tubing connected to drain through one of the holes.

I've always just dropped it on the skid plate and cleaned it up with a rag. Be prepared it will flow out of the majority of the holes to the rear of the skid plate so be ready to catch it.
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Old 01-23-2020, 11:07 AM
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Thats some good info, I'll support the trans if I drop the plate, thanks!
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Old 01-23-2020, 07:20 PM   #6
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I let it drain on the skid plate then clean it afterwards. Dropping it to change it seems like extra work for no real benefit.
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Old 01-23-2020, 09:20 PM   #7
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I have a Rubicon. Recently changed the fluid. No need to remove the skid plate and the plugs are 10mm HEX.

Buy a fluid transfer pump and you'll be OK. Fluid is ATF+4

BA
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Old 01-27-2020, 01:29 PM   #8
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FYI make sure to remove the fill plug before removing the drain....
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Old 01-27-2020, 04:04 PM   #9
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Yes, because finding out the fill plug is borked BEFORE you drain is a good thing.
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Old 01-30-2020, 09:58 PM   #10
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Quote:
Originally Posted by BM3 View Post
FYI make sure to remove the fill plug before removing the drain....
I learned that the hard way on one of my XJs.

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