The Mud Pit > Wrenching
yj 4wd issues
Axle:
Definitely not a u-joint. It has to be something with the shift fork in the axle tube or the transfer case like Kirk said. It's a bit of work, but if he has the time and tools, he needs to pull his right outer shaft and shine a light down the tube. If the shift forks are bent or busted, then that's the problem. Kirk, am I on a good track here?
kirksjeep:
--- Quote from: Axle on May 22, 2009, 02:06:30 AM ---Definitely not a u-joint. It has to be something with the shift fork in the axle tube or the transfer case like Kirk said. It's a bit of work, but if he has the time and tools, he needs to pull his right outer shaft and shine a light down the tube. If the shift forks are bent or busted, then that's the problem. Kirk, am I on a good track here?
--- End quote ---
I didn't think about the shift fork being bent, but if it is it could be rotating around and contacting the inner housing. He wouldn't have to pull the whole axle shaft out since the shift fork assembly can be pulled out the back of the axle with 4 bolts. Make sure the fork/ pads and collar are all working and are not bent/ nicked etc..
The NP231 is a pretty stout transfer case and not very problematic. The YJ vacuum actuator shift fork is very problematic, just one of the reasons I took mine out. I would off up my old one but I sold it to a guy in NY for more then a paid for my XJ solid shaft ;D. If the shift fork is bad, let me know and I can walk you guys through a solid shaft conversion, which is cheaper and stronger.
I still recommend pulling the front drive shaft, shifting into 4wd and trying to drive it. I think it would give you less places to look for the problem.
Axle:
--- Quote from: kirksjeep on May 22, 2009, 04:01:23 AM ---
--- Quote from: Axle on May 22, 2009, 02:06:30 AM ---Definitely not a u-joint. It has to be something with the shift fork in the axle tube or the transfer case like Kirk said. It's a bit of work, but if he has the time and tools, he needs to pull his right outer shaft and shine a light down the tube. If the shift forks are bent or busted, then that's the problem. Kirk, am I on a good track here?
--- End quote ---
I still recommend pulling the front drive shaft, shifting into 4wd and trying to drive it. I think it would give you less places to look for the problem.
--- End quote ---
Right on. Tim, let me know if you need help. Other than helping Will with his lift, I don't have much going on.
calvynandhobbs:
If this ends up being the shift fork actuator and you don't want to convert your axle to non-disconnect let me know. That XJ that I have out at Jeremy's house is a vacuum disconnect style. If it ends up being in the gears, I'm pretty sure the XJ has 3.55s in it if that is what that YJ has.
kirksjeep:
I checked over on Jeep Forum, since this is a problem I have never delt with and I've been driving YJ's for 14 years now. I found two other guys that sounded like they had similar problems.
Guy#1: Could drive in 4wd but had a lot of binding. It was also hard to shift into and out of 4wd. His problem was in the sift fork not sliding far enough over. It turned out that it was his 4wd actuator swich on the top of the transfer case. The little ball valve wouldn't allow enough vacuum to pull the fork over. He also had a bent shift fork and after replacing both, it solved his problems.
Guy#2: Bought Jeep with a bad transfercase and after replacing it, he could only drive a couple of feet before the Jeep would come to an abrubt stop, like he slammed on the brakes. Turned out that the P.O. swapped out the rear axle after mostl likely breaking the D35 and replaced it with a D35 that had a differnt gear ratio. Turn out the front has 3.73 gears and the rear had 4.10.
It you try the stuff Guy#1 did and you still have problems, you can verify the gear ratios by looking at the numbers on the carrier.
43-14 = 3.07
39-11 = 3.55
41-11 = 3.73
41-10 = 4.10
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