np231 or np242 for cherokee's

[Brad]

Chris: Passenger-side inner axle is a two piece with a sleeve operated via a vacuum-actuated shift fork. But that's kinda offtopic to this thread.

Lookee here: http://xjconnection.jtv.cc/dana30_xj.htm

Couldn't tell you how that's supposed to work with a locker in place, but you can clearly see that it's simply disconnecting the longer shaft and leaving the short shaft turning the R&P and driveshaft.

 

[Brett]

Chris: Passenger-side inner axle is a two piece with a sleeve operated via a vacuum-actuated shift fork. But that's kinda offtopic to this thread.

Lookee here: http://xjconnection.jtv.cc/dana30_xj.htm

Couldn't tell you how that's supposed to work with a locker in place, but you can clearly see that it's simply disconnecting the longer shaft and leaving the short shaft turning the R&P and driveshaft.

Just an FYI...when I had a cherokee with a disco 30, I couldn't enagage 4wd with the vehicle moving without some nice clunks and shudders. I thought I was breaking parts off when I did it ONCE.

 

[JF1]

Just an FYI...when I had a cherokee with a disco 30, I couldn't enagage 4wd with the vehicle moving without some nice clunks and shudders. I thought I was breaking parts off when I did it ONCE.

I wonder if you weren't getting full vacuum to the shift motor? The only time I had trouble with mine was when there was over about a 5 lb difference in tire pressure between the two fronts. Must have been binding up on me.

 

[crimsonride]

Chris: Passenger-side inner axle is a two piece with a sleeve operated via a vacuum-actuated shift fork. But that's kinda offtopic to this thread.

Lookee here: http://xjconnection.jtv.cc/dana30_xj.htm

Couldn't tell you how that's supposed to work with a locker in place, but you can clearly see that it's simply disconnecting the longer shaft and leaving the short shaft turning the R&P and driveshaft.

Yup, you're right brad. But the short shaft won't turn the R&P. What's going to happen first? The drive side shaft is going to spin the spiders and rotate the pas. side inner in the opposite direction -or- the friction to spin the spiders and pas. side inner is less than that of the carrier, r&p, front drive shaft and chain assembly in the t-case causing all of that to ratate.
With a locked diff the driver side shaft would rotate the carrier and R&P along with everything else.

JF1, can you rotate your front shaft with the jeep in park?

 

[JF1]

JF1, can you rotate your front shaft with the jeep in park?

Yep. Dang, just noticed I always forget to grease that zerk on the driveshaft.

(JF1 doesn't sound right, call me Joe)

Joe F.

 

[Brett]

I wonder if you weren't getting full vacuum to the shift motor? The only time I had trouble with mine was when there was over about a 5 lb difference in tire pressure between the two fronts. Must have been binding up on me.

Oh, I know I wasn't getting enough vacuum to operate the motor. I always used compressed air to unlock it after four wheeling

 

[Brad]

Mebbe the 229 in Brett and crimson's XJs did not have the syncro collar that the 231 has. Come to think of it, I don't think I could ever shift crimson's XJ (when I had it in HS) into 4 without some effort, even with the ignition off and the transmission in neutral. So JF1 was able to shift into 4HI due to the disco axle still rotating the R&P and front driveshaft, as well as a syncro collar in his TC.

 

[Brett]

Mebbe the 229 in Brett and crimson's XJs did not have the syncro collar that the 231 has. Come to think of it, I don't think I could ever shift crimson's XJ (when I had it in HS) into 4 without some effort, even with the ignition off and the transmission in neutral. So JF1 was able to shift into 4HI due to the disco axle still rotating the R&P and front driveshaft, as well as a syncro collar in his TC.

My NP229 actually used a vacuum operated switch to put it into 4Hi. Does Chris's XJ have that little switch right in front of the e brake? As for the syncro, I don't remember it having one. I blew that T case up about 4 times too, so I saw the inside a lot

 

[Brad]

Does Chris's XJ have that little switch right in front of the e brake?

Yep.

 

[Brett]

Yep.

It's such POS....mine froze in winter once