I have my NP242

[RunMonkeyRun]

Well I found a np242 at the scrap yard, came from a 97 gc with 150000klm on it. Will need to be flushed out seeing how the oil was dark red, I have the np249 in my 96 gc and wondering if this will fit without having to change the shaft, were all np249 be the same length or no? and if so what is the length so I could measure it? any other advice before i get down and dirty before the swap? should I use synthetic oil ect.

by the way anyone can tell me how to post the pictures so i can show you the pictures.

Thanks Rob

[Caribbean ZJ]

isnt tranny oil dark red. Dont go puttin engine oil in there. good luck wid d swap

[RunMonkeyRun]

Originally Posted by Caribbean ZJ

isnt tranny oil dark red. Dont go puttin engine oil in there. good luck wid d swap

ya it is red, but dirty and dark red likeit has never been changed.

[hardisk_c]

Jeep Horizons has a decent walkthrough posted about the 249/242 swap here. If the atf in the case was dark red/brown, it was definately gone, ATF should be arterial red if in good condition. When I did the R&R of the coupler, I used Amsoil synth to refill the case in hopes it would not break down as fast as the regular ATF+3. Be sure to keep about 4-5 quarts of your favorite blend on hand for trans purposes as well as refilling the tcase. . . the coupler plate of the case acted like a plug on the trans in my 94 grand, and the moment the case came out, the trans tried to empty itself on my buddy's garage floor. My advice would be to either have a friend on the business end of the jack that is used to support the transmission or be prepared yourself to quickly jack up the transmission a bit to minimize fluid loss. Hope this helps

[RunMonkeyRun]

Originally Posted by hardisk_c

Jeep Horizons has a decent walkthrough posted about the 249/242 swap here. If the atf in the case was dark red/brown, it was definately gone, ATF should be arterial red if in good condition. When I did the R&R of the coupler, I used Amsoil synth to refill the case in hopes it would not break down as fast as the regular ATF+3. Be sure to keep about 4-5 quarts of your favorite blend on hand for trans purposes as well as refilling the tcase. . . the coupler plate of the case acted like a plug on the trans in my 94 grand, and the moment the case came out, the trans tried to empty itself on my buddy's garage floor. My advice would be to either have a friend on the business end of the jack that is used to support the transmission or be prepared yourself to quickly jack up the transmission a bit to minimize fluid loss. Hope this helps

I was thinking of opening it and check out the gears and that because of the oil being so dirty. I have been wondering if I should put snytheic oil in it, either way i have to flush it out. How about synthetic in the tranny?

[JDPascal]

Hey RMR

What you might consider is flushing it with new regular atf before you install it. If it is what you consider "real dirty" put in 3 or 4 qts (over fill) and roll it around on the floor and drain it - maybe a couple of times if you want ot be anal about it.... I wouldn't suggest a solvent flush at all. Regular ATF is relatively cheap and one way to get most of the guk out.

When you've installed it, do the initial fill with more of the dino atf for a few hundred miles, just to be sure - drain it and install the good stuff..

Good luck with the conversion.

JD

[RunMonkeyRun]

Originally Posted by JDPascal

Hey RMR

What you might consider is flushing it with new regular atf before you install it. If it is what you consider "real dirty" put in 3 or 4 qts (over fill) and roll it around on the floor and drain it - maybe a couple of times if you want ot be anal about it.... I wouldn't suggest a solvent flush at all. Regular ATF is relatively cheap and one way to get most of the guk out.

When you've installed it, do the initial fill with more of the dino atf for a few hundred miles, just to be sure - drain it and install the good stuff..

Good luck with the conversion.

JD

thanks JD i will do that, one thing though is after flushing as you said would it be worth while to put synthetic oil in after words?

from what i am reading i think i should have grabbed the shift beasel for the np242 aswell, or will the one i have fit?

[JDPascal]

I would run the regular atf in the transfer case for a short while before installing the synthetic.

The bezel for the 242 has a different shift pattern than the 249 so a change might be beneficial. your choice....

JD

[RunMonkeyRun]

Originally Posted by JDPascal

I would run the regular atf in the transfer case for a short while before installing the synthetic.

The bezel for the 242 has a different shift pattern than the 249 so a change might be beneficial. your choice....

JD

ya i thought so i willgo back tomorrow an pick it up but how ever took the centre consile made a mess of the selectrack indicator.

ya i will run itfor a bit with the atf for awhile to clean out the xfercase.

thanks again jd

[jeeperphil]

You will also need to swap the plugins on the back of the vic (vehicle info center) Follow the wiring back from it until you see 2 sets of plugs. One red and one black. Disconnect the set that is plugged in and connect in the other set. This will allow the vic to read what position the case is in. All 242 cases did NOT have the same input shafts. Just drain the regular fluid and add the synth when ready. No flushing needed. I did the swap over a year ago, still going well. Good luck!

[Ron68]

I did a replacement of a NP242 in an 87 Cherokee. At the bottom of the case is the lower drain plug. Carefully remove it and look inside. There is a pick up screen for the oil pump just inside. Mine had quite a bit of rubber particles blocking the screen. When the transfer case is assembled, there is no gasket used, just a bead of black RTV sealant type stuff. Any excess sealant squeezed out internally during assembly ends up in the sump where the pump pick up is. I found it in the 87's case, and the same thing in the case on my 97 Grand Cherokee. I used a small bent wire to pull out the pieces in my 97 and I used air to blow out more.

[RunMonkeyRun]

Thanks guys, what kind of syn's are you using? Well I will tackle the swap after the long weekend, go figure I just finshed fixing the linkage on the np249 in case I need the low forwhen I put the boat in the w
water.


Crap avatar to small.