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Old 06-25-2014, 08:20 PM
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Need some guidance

Hello...."new" to this forum but not new, at all, to turning wrenches or working on this Jeep. But needing some direction....

Have a 1999 Jeep Grand Cherokee 4.0 with 4WD Selec Trac. Apparently the transfer case seal between the transfer case and the transmission is leaking so I have a fun project ahead of me. What I'm looking for is:
1) Any write-ups that could help with the dropping of the xfer case. I plan to also replace the trans seal while there
2) Oil. SOOOO confused here. The manual says the trans takes ATF+3 and the transfer case takes Dexron III. I was in a pinch today so I dropped in almost a quart of Dexron VI (poor thing was quite low). So that said, can I use ATF+4 for the trans and Dexron VI for the transfer case or do you all suggest something else? I've read so many articles today that I don't know which direction to head. I'd love to use AMSOIL so if this is an option, which would I get?

Thanks!
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Old 06-25-2014, 09:26 PM
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Re: Need some guidance

You should have the NV 242 T-case in your jeep, which uses the ATF+4 fluid, same as the transmission. Some guys run amsoil in both without any problem. An other member will hopefully chime in on which type to use.
I donīt have a NV242 in my jeep, but the NV 247, but regarding removal/installation its almost the same. First remove the front and rear propeller shafts. Now remove the T-case selector cable, T-case position sensor connector and the breather tube.
The T-case mount serves also as rear mount for the engine/transmission, so you will have to put a jack with a large piece of wood under the transmission pan to take over the weight. Then you can remove the 8 bolts which hold the crossmember in place. Its maybe a good thing to leave the T-case connected to the crossmember and remove it together (i didnīt do it like this, but i think it is possible) . You then unbolt the T-case from the transmission (6 nuts on studs) and then you can slide it backwards a bit to release the studs and the transmission to T-case spline and it can be lowered. Best to have two persons carrying the weight, because lying underneath its quite a heavy thing.
The T-case front seal is mounted in the front bearing retainer, which is mounted with 4 bolts.(see attached page). Donīt know how the transmission output shaft seal is mounted.
Attached Files
File Type: pdf NV242 input shaft seal.pdf (136.1 KB, 1 views)
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  #3  
Old 06-26-2014, 06:15 AM
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Re: Need some guidance

Thank you for the information Frango100! This will be quite helpful when I dive into this project in a couple weeks.

As for the oil, so I'm reading this to say that ATF+4 is good for the trans and the NV242 transfer case. I always get nervous about this stuff (trans and transfer case oils) as I don't want to put in the wrong oil and then find myself with a bigger issue on my hands. On 2 of my vehicles (this Jeep and a Ford) the manuals call for a different oil in the transmissions from the transfer case. I wonder why the manufacturers do that?

Thanks again!
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Old 06-26-2014, 06:58 AM
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Re: Need some guidance

The manuals which came with the jeep, are never updated. Sometimes a TSB (technical service bulletin) calls for an other fluid type (which happened for the NV147 and NV247, where they went from ATF+4 to special MOPAR fluid (=Mobil 424) after clutch chatter).
Either way, ATF+3 was substituted by ATF+4, which has better properties.
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Old 06-26-2014, 09:51 AM
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Re: Need some guidance

The best way for lowering & raising an xfer case from the vehicle is to make a simple holding fixture out of wood & attach it to your floor jack. Take two pieces of cardboard & roughly trace out the outlines of the case (front & back). Cut out these patterns on some scrap wood & take other scraps of wood to make a box which will have a "level" bottom & slanted top edge (to match the shape of the case). Attach the box to the shoe of your floor jack & you can then raise & lower the xfer case while it stays level.

The only catch is you have to raise the vehicle enough to allow room for the box & jack (you'll want to make the box as short as possible).

I'll think I still have some pictures I took of the last one I made (for a dodge truck). I'll look tonight & post them.
Mike Sal
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