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Old December 17th, 2005, 08:30 PM   #1
ksejeeper
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Default 4wd help needed

My 4wd on my Yj isn't working when I pull the lever the (Np231) transfer case goes in 4hi and 4Low but front axel won't angage(Dana 30) . Also the jeep has been sitting for about 2 months now could i have just gotten moister in the axel and the shit fork is stuck. :dunno:If any one has had this problem befor LMK thanks
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Old December 17th, 2005, 10:15 PM   #2
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Can you verify the Tcase is shifting? Easiest is to put the vehicle up on 4 blocks and try spinning them. Busted linkage, chain, any number fo things. But from sitting?
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Old December 18th, 2005, 06:40 AM   #3
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the axle is vacuum shifted, so the switch is probably stuck on the t case, check for vacuum at the switch and at the axle whiles in 4x4, if you have one and not the other you found the problem.
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Old December 18th, 2005, 09:23 AM   #4
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I've been hearing people talk about this a lot as a permanent solution to the vacuum problem:


http://www.4x4posi-lok.com/app_jeep.html
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Old December 18th, 2005, 11:02 AM   #5
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I have a YJ that did the same thing. Check the vacuum hose. It comes off of the side of the transmission and goes into the top of the passenger side of the axle. unplug this and plug it back in. There is also a electric connection too. test these wires and see if they are doing anything.

you can always canabalize a vacuum hose off of the engine somewhere and run that down to your axle for a quick easy solution if its too cold right now to deal with it. That will engage your axle.
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Old December 18th, 2005, 11:22 AM   #6
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Probably the vac switch on the t-case, either it went bad or moisture got in it and froze... in either case I would replace it for 14 bux

could be a vac line too.

Lothos.. Yjs the front wheels wouldn't spin even with the t-case in 4wd without vacuum, the driveshaft to the front will though
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Old December 18th, 2005, 01:09 PM   #7
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Got it fixed shift fork was frozen in place just took my propain (sp) torch to it and will moves now

thanks everyone
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Old December 18th, 2005, 03:34 PM   #8
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Quote:
Originally Posted by ksejeeper
Got it fixed shift fork was frozen in place just took my propain (sp) torch to it and will moves now

thanks everyone

spray some wd 40 in the vacuum ports when it's warm, and off the vehicle. It will displace the moisture. Then, drain the wd and reinstall
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Old December 18th, 2005, 07:24 PM   #9
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Check the vacum switch on the tcase, then for vacum at the axle if thsoe two are good then pop the cover and fork off the axle check to see if the collar moves freely.

Mine wasn't working the other day. The switch was good and I had vacum, so I figured there was a tear in the rubber membrane in the vacum actuator at the axle. So, my dumbass tore the actuator apart drilled a few holes and made it cable actuated only to find out the problem wasn't with the vacum actuator but the collar was stuck and I fixed it with a couple hits with a rubber mallet, JEEP-> <-ME and the manual enguagement system I put in was for nothing, oh well.

Which reminds me . . . as of right now I enguage the front axle with a lever on the floor and it works great however I think it looks like shit. I'm looking for a t-style pull handle I can install in the dash that either ratchets or pulls and twists to lock in place if anyone uses something similar for this what did you get it from?
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Old December 18th, 2005, 07:28 PM   #10
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Quote:
Originally Posted by jeeperscreepers89
Which reminds me . . . as of right now I enguage the front axle with a lever on the floor and it works great however I think it looks like shit. I'm looking for a t-style pull handle I can install in the dash that either ratchets or pulls and twists to lock in place if anyone uses something similar for this what did you get it from?

Quote:
Originally Posted by PavementPounder
I've been hearing people talk about this a lot as a permanent solution to the vacuum problem:


http://www.4x4posi-lok.com/app_jeep.html

Look at the handle they use.
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