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Techline, WJ Quadra-Trac to Select-Trac Swap

Transfer case swapping to save $$$ and for more options.

Verne SimonsWords and Photos

Hello FW staff!

I have a 2001 Jeep WJ Grand Cherokee with the 4.7L V-8. I would like to convert the Qudra-Trac to a Select-Trac. Could you offer any detailed information on this swap?

Thank you, AJ

Haha! Several years ago I did this exact swap while I was working at Jp Magazine in a 2001 Jeep WJ Laredo I owned at the time. It was a great swap. I loved having the 2wd option and the AWD option that comes with the Select-Trac, and the swap will probably save you money since the special Quadra-Trac 247 transfer case you have in your WJ will cost a lot to get properly rebuilt. The article is several years old and the online version doesn't quite have the details that I added into the paper article (the photo captions seem to be missing). The swap is relatively easy and the NP242 is a much easier transfer case to deal with (when compared to the NP247). The article online is here: (https://www.fourwheeler.com/how-to/transmission-drivetrain/154-1110-jeep-wj-grand-cherokee-quadra-tec-select-trac-swap/).

I also answered another readers similar question, although about a ZJ Grand Cherokee not a WJ here: (https://www.fourwheeler.com/how-to/tech-qa/1608-nuts-and-bolts-easy-jeep-t-case-swap/), and the meat of the details of my advice haven't changed much and are probably best just copied from a younger version of myself from that article here:

"As for what you will need, the first step is to acquire an NP242 from an XJ Cherokee, ZJ Grand Cherokee, or MJ Comanche (older Verne adds also from a WJ Grand Cherokee). They were used sporadically starting in 1987 depending on how these vehicles were optioned out, but they were never offered behind ZJs with a V-8. It should be noted that the NP242 was also used in select Dodge applications, but none of these are viable swap candidates. They are relatively plentiful in junkyards, and for this reason we recommend trying to find one close to the same year as your Grand. Why? It's more likely to have the correct speedometer drive gear provisions that you'll need as well as the correct driveshaft configurations.

Although they were pretty consistent throughout their production run, there are a couple of key differences you'll need to pay attention to. The most important is the front input gear; while they are almost all 23-spline, the input gear length can vary, and it's likely going to be different than your V-8 Grand. This isn't a big deal, however, because you can swap the input gear from your existing NP249 into the NP242. They interchange, but be aware that there may be a difference in the input bearing width that you'll need to address. The procedure requires complete disassembly of both transfer cases to do the swap, but the process isn't that hard as long as you have a good pair of snap ring pliers. There were a couple of different rear driveshaft arrangements used, so take note of what you have and select a donor that matches. The external dimensions of the cases are very similar, so more than likely you won't need to do any driveshaft modifications if you get the right donor. All of the sensors should bolt right up, and even the existing transfer case shift linkage you have can be adjusted to work with the NP242 if you shorten the shift lever arm on the T-case. For good measure, you can also swap the shift mechanism and bezel from a NP242-equipped ZJ for a correctly labeled range selection and a completely stock-looking swap once you're done."

As anyone should, since writing the above, I have learned a bit more about the topic that you will find useful. First off I would amend what I said above and look for a NP242 (select Trac) from a 6-cylinder WJ, If you can find one that is the same year as your WJ that's even better. Or at least get one from a late model, 1995-2001 XJ as the older transfer cases may have other changes (like gear tooth pitch and count) that will make them harder or impossible to swap. As said, ideally get the parts from a I-6 powered WJ and be sure to grab everything including the driveshafts, the shifter assembly from inside the donor WJ, The shifter cable, the shift lever on the T-case, the T-case its self, and maybe even the wiring pigtails for the sensors (incase your plugs are different).

Haha! Several years ago I did this exact swap while I was working at Jp Magazine in a 2001 Jeep WJ Laredo I owned at the time. It was a great swap.