Jeep JK Wrangler NV-241 / NV-241OR
Transfer Case Service

October 21st, 2008 | Category: Jeep JK Write-Ups, Operation & Maintenance

As a good part of routine maintenance on your Jeep JK Wrangler, it is highly recommended that you service your NV241 or NV241OR transfer case once every 30,000 miles. Changing out the ATF+4 transfer case fluid will give you an opportunity to inspect it for any signs of abnormal wear going on inside (i.e. bits of metal coming out) and new fluid will help keep things operating smoothly.

This is a very simple task and can be done in minutes with the right tools. Also, any ATF+4 fluid can be used.

What You Will Need

(2) Quarts ATF+4
• 18mm Socket
• 10mm Allen Bit
• Ratchet
• Bottle Pump
• Oil Catch Pan
   

Instructions

1. Park your Jeep JK Wrangler on level ground. Then, using an 18mm socket, remove the 4 bolts securing the transmission skid plate to the frame driver side frame rail, cross member and gas tank skid plate. 2.Place an oil catch pan underneath your NV241 transfer case and then, using a 10mm allen bit, remove the fill bolt as shown in this pic. 3. Using the same 10mm allen bit, loosen your NV241 drain bolt to the point where you can remove it by hand.
4. Continue removing the NV241 drain bolt by hand and then let the fluid drain completely into the oil catch pan.
5. Once completely drained of all its fluid, reinstall the NV241 drain bolt using a 10mm allen bit.
6. Attach a bottle pump to your ATF+4 fluid bottle, insert the feeder tube into the fill hole on your NV241 transfer case and then begin pumping the fluid into it. It should take about 2 quarts of fluid to fill and you’ll know when it’s full when fluid starts to ooze back out the fill hole.
7. Once the ATF+4 starts to ooze back out, quickly reinstall the fill bolt onto your NV241 transfer case using a 10mm allen bit, clean up your mess and you’re done.
If you have an NSG 370 manual transmission and if you haven’t done so already, I would highly recommend that you now move over to it now and service it as well. Click on the link below to see a detailed write-up on how to service it:

Jeep JK Wrangler NSG 370
Manual Transmission
Service

When finished, please be sure to take your used transmission fluid to your local auto parts store to have it disposed of properly.

12 Comments so far

  1. Project-JK.com - Jeep JK Wrangler Resource » Jeep JK Wrangler NSG-370 Manual Transmission Service October 21st, 2008 3:03 pm

    [...] Jeep JK Wrangler NV241 Transfer Case Service [...]

  2. tom December 27th, 2008 7:29 pm

    so this is for the auto trans right?

  3. Whpony96 February 19th, 2009 3:11 pm

    No this is for the Transfer case.

  4. Reid June 3rd, 2009 10:51 pm

    What is that round thing to the left of the fill plug?…my jk does not have that…

  5. wayoflife June 3rd, 2009 11:33 pm

    it’s a vibration dampener - not all jk’s have it.

  6. Jiblet June 16th, 2009 9:18 pm

    WOL- great write-up. Can you tell me where you got that bottle pump? I can’t find anything like it around here. Thanks.

  7. wayoflife June 17th, 2009 2:15 am

    i got mine from pepboys but have seen it at kragen as well. in some places, kragen is called checkers. it should be in the gear oil section.

  8. bob August 19th, 2009 8:24 pm

    I’ve seen the bottle pumps at every autoparts store I go to, Sears, etc.

  9. Wink January 1st, 2010 7:11 pm

    Got my pump at Autozone, in the motor oil/gear oil/trans fluid section. Cheap, under $10. Great writeup. Haven’t done this yet, but just did rear diff. Easy!

  10. runit3 January 16th, 2010 2:12 am

    What driveshafts are those?

  11. Jason March 29th, 2010 9:11 am

    I did this over the weekend. It is extremely awkward to fill without a GOOD pump like the one WOL is using. My local autozone only had two pumps, one wouldnt work and the other was just a tube with a squeezable bladder. After about 1000 squeezes I was left with a quarter full transfer case and a brutal hand cramp. I ended up making my own custom funnel out of a paper plate. I ended up needing 2.5 quarts to compensate for my idiocy. Ended up getting it full. A definite learning experience. Thanks for the write up WOL.

  12. Jeff May 15th, 2010 11:06 pm

    So Easy my grandmother could do it! Now my wife wants me to change the oils on her car.

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