Comanche_Fanatic Posted January 1, 2014 Share Posted January 1, 2014 this thread started from the 231 > 249 swap which the idea has been scrapped and will begin the hunt for selec-trac system. i will be keeping both front and rear axles, but the BA10 has to go, i have gotten a external salve, 23 spline, AX15 fron a '96 XJ 4.0 4x4. which year, model, etc 242 would i need to search for to avoid mismatches? i think theyre all 23 splines but are they supposed to be short input or long input? does the year affect the bolt on capabilities? will the rear driveshaft need to be modified? Link to comment Share on other sites More sharing options...
Mattwheels Posted January 1, 2014 Share Posted January 1, 2014 242's come in 21 spline and 23 spline, For your transmission though I believe you need a 94+ 242 and unfortunately they come in long medium and short input. Medium is quite rare though. Thats all the information I know about them Link to comment Share on other sites More sharing options...
Comanche_Fanatic Posted January 1, 2014 Author Share Posted January 1, 2014 242's come in 21 spline and 23 spline, For your transmission though I believe you need a 94+ 242 and unfortunately they come in long medium and short input. Medium is quite rare though. Thats all the information I know about them thank you, now I have to search for 94+ 23 spline all i need to know now is the input length and if the yokes match MJ axles. would I have to search for 242s out of an XJ? arent theyre harder to find? Link to comment Share on other sites More sharing options...
Mattwheels Posted January 1, 2014 Share Posted January 1, 2014 don't quote me on this, but the 242 out of the ZJ, XJ and maybe the KJ? I know the continued using them in the liberty's from 02, but I would stick to ZJ and XJ's. They are more sought after so I could only assume they will be harder to find but it all depends on the saturation in your area. Link to comment Share on other sites More sharing options...
Alexia Posted January 1, 2014 Share Posted January 1, 2014 The NP242 behind the AW4 automatic in a 1991+ XJ and ZJ will be medium input. You will need to harvest a short input gear from another transfer to use it on an AX15. Be aware of the gear cut change in 1993/1994.(Which always makes me recommend grabbing a 1994/1995 transfer case to start with.) http://www.novak-adapt.com/knowledge/np_nvg_input_gears.htm Yokes will match; swapping to a NP242 is nearly a drop in replacement besides adjusting shift lever and 4WD indicator switch. I swapped a NP242 in place of my NP231 in my 2004 Wrangler. Link to comment Share on other sites More sharing options...
Mattwheels Posted January 1, 2014 Share Posted January 1, 2014 Also all 242's out of ZJ's are 23 spline Link to comment Share on other sites More sharing options...
Comanche_Fanatic Posted January 1, 2014 Author Share Posted January 1, 2014 The NP242 behind the AW4 automatic in a 1991+ XJ and ZJ will be medium input. You will need to harvest a short input gear from another transfer to use it on an AX15. Be aware of the gear cut change in 1993/1994.(Which always makes me recommend grabbing a 1994/1995 transfer case to start with.) http://www.novak-adapt.com/knowledge/np_nvg_input_gears.htm Yokes will match; swapping to a NP242 is nearly a drop in replacement besides adjusting shift lever and 4WD indicator switch. I swapped a NP242 in place of my NP231 in my 2004 Wrangler. newer is always better, I will be getting a 94+ 242. it seems that I won't be able to find a factory, 23-spline, short input gear 242 from 94+. even if it does exist what vehicle would it be from. Link to comment Share on other sites More sharing options...
Mattwheels Posted January 1, 2014 Share Posted January 1, 2014 94+ ZJ would be the best bets. Link to comment Share on other sites More sharing options...
Comanche_Fanatic Posted January 1, 2014 Author Share Posted January 1, 2014 94+ ZJ would be the best bets. theyre all medium inputs. looks like I have to get 2 t-cases to make one work. or just get a 231 from a wrangle AX15, then i can deal with all this when I have more time in the future. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted January 1, 2014 Share Posted January 1, 2014 The best case you could possibly get is a 96+ from any xj or zj. It has sealed output, making it possible to drive home if you lose a rear ujoint in part time 4x4. Now, the input IS a medium input. But. The Ax15 has a very long tailshaft in comparison to some, and the medium input will work perfectly fine on an Ax15. The spline goes easily another 2" inside the output housing, and there is absolutely nothing in the way that would cause an issue with installing that transfercase on an Ax15. My 99 XJ was 4.0/ax15 with a 242 from a 96 XJ with AW4. Medium length input. Zero issues with fitment. Does the Ax15 *need* a medium input? No. But it really is a moot point as there is more than enough room to use one. I'd also suggest this point: Benefit of 242 over 249 and 231 242: 2x4: Summer fuel mileage and fair weather. Wonderful to have as an option. 4x4 Part Time: full lock front to rear (slip determined by axles only, i.e. a locker or trac-lock will limit slip and give you more control vs. a 249) 4x4 Full Time: Same function and feature as a 249, without the potential failures of a hydraulically controlled slip. User friendly, performance similar to a 249 Neutral (as all have) 4x4 Low Range: Unlike the 249, this 4x4 low range is a full lock with zero slip potential in the tcase. It gives you the stability and control that you want, in the instance that you need low range. I left my xj in full time pretty much all the time. It was fun. Some nay-sayers will tell you that a full time tcase cannot work behind a manual transmission. They are incorrect in that. The negatives of a manual with full time are that, if you coast in neutral, the tcase will function as though there is a slip and act accordingly. Fortunately, this is just a result in the planetary assembly taking up the slack and rotating until it "binds" between front and rear axles, and I will coast as well. This cannot damage the case in any immediate way (it will necessitate more frequent fluid changes to inspect for wear, but not hinder performance so long as maintained). The reality is that most people don't coast in neutral. It doesn't take but a split second to shift, so the potential backfeed to damage synchros is minimal at best. Link to comment Share on other sites More sharing options...
Comanche_Fanatic Posted January 2, 2014 Author Share Posted January 2, 2014 I can't tell you what a relief it is to hear all this, especially on my birthday. thanks guys y'all been a big help. now I know what to get and I'm sure I can take it from here, I may ask some more questions in the near future about the transmission itself. Happy New Years Jeepers! Link to comment Share on other sites More sharing options...
mvusse Posted January 2, 2014 Share Posted January 2, 2014 The best case you could possibly get is a 96+ from any xj or zj. It has sealed output, making it possible to drive home if you lose a rear ujoint in part time 4x4. Now, the input IS a medium input. But. The Ax15 has a very long tailshaft in comparison to some, and the medium input will work perfectly fine on an Ax15. The spline goes easily another 2" inside the output housing, and there is absolutely nothing in the way that would cause an issue with installing that transfercase on an Ax15. My 99 XJ was 4.0/ax15 with a 242 from a 96 XJ with AW4. Medium length input. Zero issues with fitment. Does the Ax15 *need* a medium input? No. But it really is a moot point as there is more than enough room to use one. I'd also suggest this point: Benefit of 242 over 249 and 231 242: 2x4: Summer fuel mileage and fair weather. Wonderful to have as an option. 4x4 Part Time: full lock front to rear (slip determined by axles only, i.e. a locker or trac-lock will limit slip and give you more control vs. a 249) 4x4 Full Time: Same function and feature as a 249, without the potential failures of a hydraulically controlled slip. User friendly, performance similar to a 249 Neutral (as all have) 4x4 Low Range: Unlike the 249, this 4x4 low range is a full lock with zero slip potential in the tcase. It gives you the stability and control that you want, in the instance that you need low range. I left my xj in full time pretty much all the time. It was fun. Some nay-sayers will tell you that a full time tcase cannot work behind a manual transmission. They are incorrect in that. The negatives of a manual with full time are that, if you coast in neutral, the tcase will function as though there is a slip and act accordingly. Fortunately, this is just a result in the planetary assembly taking up the slack and rotating until it "binds" between front and rear axles, and I will coast as well. This cannot damage the case in any immediate way (it will necessitate more frequent fluid changes to inspect for wear, but not hinder performance so long as maintained). The reality is that most people don't coast in neutral. It doesn't take but a split second to shift, so the potential backfeed to damage synchros is minimal at best. Even though the 231 has a brass synchro between 2wd and 4-high, the 242 does not have any synchros whatsoever. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted January 3, 2014 Share Posted January 3, 2014 True. The 242 doesn't really need them, though, as the differential can and will take up the difference in slack to allow for shifting. Either way, shift on the fly is still low speed with a tcase. Link to comment Share on other sites More sharing options...
Rockfrog Posted January 3, 2014 Share Posted January 3, 2014 Only the CAD year 231s had synchros ... the later years didn't have them either. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted January 3, 2014 Share Posted January 3, 2014 I was thinking that, but couldn't remember. Been awhile since I have had a 231 apart Link to comment Share on other sites More sharing options...
mvusse Posted January 3, 2014 Share Posted January 3, 2014 Only two 231s I had apart were 1980s. Never had a newer one apart yet. Link to comment Share on other sites More sharing options...
Incommando Posted January 3, 2014 Share Posted January 3, 2014 I will throw out right up front that this is from various net postings and I have zero personal experience with the issue. There are many out there who swear that a stick with a 242 will wear out the transfer case prematurely. Whether it has to do with the drive line slack/power being applied so many times and the 242 having to absorb that every time or another issue is debated, as well. The constant pressure of the automatic is said to alleviate the slack/power cycle issue if there is one. If someone can would they please list all of the factory applications of a 242 with a manual tranny? I could not find any. There were so many combos available over the years to fit some pretty small market groups that the argument that 242's only came in "upscale" jeeps where the buyers would not want a stick seems kind of lame. That the engineers did not think that the combo would last as long does strike a cord as a reason to not make that combo available. Sure people have put this combo together and claimed to have zero issues...but I have seen people making the same claim about their running 37" tires on a D30. And it works right up until it doesn't. All of that being said I don't know whether many of us would put enough miles on a rig with this combo to notice a longevity issue in the first place. Link to comment Share on other sites More sharing options...
Crash Posted January 3, 2014 Share Posted January 3, 2014 You can always cut down the input shaft to the "short shaft" length. Link to comment Share on other sites More sharing options...
carnuck Posted January 10, 2014 Share Posted January 10, 2014 Full size Jeeps use 23 spline as well and I think they are medium depth. I used a 1" (actually, slightly more than 7/8" thick) clocking ring from partsmike.com to bolt my AX-15 and AW4 (23 spline) to '80 up full size Jeep cases (NP208, NP219, NP228, NP229) as well as Dodge NP208 plus AMC Eagle NP119, NP128 and NP129. Link to comment Share on other sites More sharing options...
aaronbtxnc Posted January 10, 2014 Share Posted January 10, 2014 Is there any possibility of a 242 with the Peugeot ba10 or should I be waiting for it to die and then do all at once replacing w ax15? Link to comment Share on other sites More sharing options...
Comanche_Fanatic Posted January 11, 2014 Author Share Posted January 11, 2014 I don't understand your question Link to comment Share on other sites More sharing options...
carnuck Posted January 11, 2014 Share Posted January 11, 2014 Is there any possibility of a 242 with the Peugeot ba10 or should I be waiting for it to die and then do all at once replacing w ax15? The 242 I have now had a BA 10/5 in front of it. I couldn't find a 23 spline 242 for reasonable cost here so I had to buy another AW4 after the new rad I got that had a "plug" inside the cooler from the factory cooked the one I put in last spring. Link to comment Share on other sites More sharing options...
Comanche_Fanatic Posted January 22, 2014 Author Share Posted January 22, 2014 Got my t-case recently, its a 249 from a '94 ZJ. Will serve me well in the future. Link to comment Share on other sites More sharing options...
carnuck Posted January 26, 2014 Share Posted January 26, 2014 Put a chain in it now if there is any slack. It's not nearly as strong as the NP219 Link to comment Share on other sites More sharing options...
Comanche_Fanatic Posted January 26, 2014 Author Share Posted January 26, 2014 Put a chain in it now if there is any slack. It's not nearly as strong as the NP219 No slack or noise, it will do fine. Link to comment Share on other sites More sharing options...
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