Techline, WJ Quadra-Trac at Select-Trac Swap
I have a 2001 Jeep WJ Grand Cherokee with the 4.7L V8. I would like to convert the Qudra-Trac to Select-Trac. Could you offer detailed information about this exchange?
Haha! Several years ago I made this exact swap while working at Jp Magazine in a 2001 Jeep WJ Laredo that I owned at the time. It was a great exchange. Loved having the 2WD option and the AWD option that came with the Select-Trac, and the swap will probably save you money, as the special Quadra-Trac 247 transfer case you have in your WJ will be expensive to rebuild properly. The article is several years old and the online version doesn’t quite have the details that I added in the print article (photo captions seem to be missing). Swapping out is relatively easy and the NP242 is a much more manageable transfer case (compared to the NP247). The online article is here: (https://www.fourwheeler.com/how-to/transmission-drivetrain/154-1110-jeep-wj-grand-cherokee-quadra-tec-select-trac-swap/) .
“As for what you’ll need, the first step is to acquire an NP242 from an XJ Cherokee, ZJ Grand Cherokee or MJ Comanche (the old Verne also adds from a WJ Grand Cherokee). sporadically from 1987 depending on how these vehicles were optioned, but they were never offered behind the ZJs with a V-8. It should be noted that the NP242 was also used in some Dodge applications, but none of these are a viable candidate for a trade-in. They are relatively abundant in landfills, and for this reason we recommend trying to find one close to the same year than your Grand. Why? You are more likely to have the correct speedometer drive gear layouts you will need as well as the correct driveshaft configurations.
While they’ve been pretty consistent throughout their production run, there are a few key differences you’ll need to watch out for. Most important is the front input pinion; although they are almost all 23 splines, the length of the input gear can vary and will likely be different than your V-8 Grand. This is not a big deal, however, as you can swap out your existing NP249’s input equipment into the NP242. They interchange, but be aware that there may be a difference in the width of the input bearing that you will need to correct. The procedure requires the complete disassembly of both transfer cases to complete the exchange, but the process is not that difficult as long as you have a good pair of circlip pliers. There were a few different rear driveshaft arrangements used, so take note of what you have and select a donor that matches. The external dimensions of the housings are very similar, so it’s more than likely that you won’t need to modify the driveshaft if you get the right donor. All of the sensors should bolt on properly, and even the existing transfer case shift linkage you have can be adjusted to work with the NP242 if you shorten the shifter arm on the T-box. For good measure, you can also swap out the gearshift mechanism and bezel from a ZJ equipped with NP242 for properly labeled range selection and a full-looking swap once you’re done.
As everyone should, since writing the above, I have learned a bit more about the subject that you will find useful. First, I would modify what I said above and look for an NP242 (select Trac) from a 6 cylinder WJ. If you can find one from the same year as your WJ, even better. Or at least get one from a later model, the 1995-2001 XJ, as older transfer cases may have other changes (like pitch and number of gear teeth) that will make them more difficult or impossible. to trade. As said ideally get the parts for an I-6 powered WJ and make sure you grab everything including the driveshafts, the shifter assembly from the inside of the WJ donor, the shifter cable gears, the shifter on the T-box, the T-box itself, and maybe even the wiring braids for the sensors (in case your sockets are different).