In 4wd Hi and 4wd low no problems at all, operates fine in forward and reverse. However, when I shift to 2wd, I start having problems.
Situation:
Driving in 4wd, come to a stop, put transfer case in 2wd, backup about a yard or two to unlock auto-locking hubs. Put in 1st and pull forward and get a grinding sound from front end, and a big clunk and shake once a second or so. Stop, put it in reverse and get the same big clunk and shake once a second or so. If I go back into 4wd hi, I have no problems. If I pull out in 4wd hi, then clutch and put the transfer case into 2wd, I have no problems. As soon as I stop though, if I back up at all, be that rolling backwards with gravity, or drive backwards in reverse, I start to get the clunk and shake, then when I pull forward I get the clunk and shake plus the grinding again.
When I got home, I found some jerk had taken my parking space, which pissed me off (straw that broke the camel's back so to speak) and I locked up the brakes, slammed it into reverse, smoked the rears slightly (I was in 2wd at the time) and pulled into another space. I realized I hadnt had any clunking or shaking, in either direction. So I backed out and drove around the block a couple times, at each stop I put it in reverse, and tried to generate the problem from earlier, but it has not returned. I'm somewhat leary of putting it in 4wd again to see if whatever it was is no longer causing a problem, since 2wd is working currently.
Anyone have any ideas, comments, recommendations?? Any help is greatly appreciated. I'm new to pickup trucks, so I don't know too much about how the transfer case, front hubs, etc, actually operate; but I am a seasoned Nissan veteran and good mechanic, so I just hope you guys can help me.
Sorry this was so long, but I wanted as much info as possible out there.
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Dave Pretz
1995 Nissan D21 Ext. Cab V6 4wd
(Actually a '96 titled as a '95, wow was that a problem to get figured out!!!)
In 4wd Hi and 4wd low no problems at all, operates fine in forward and reverse. However, when I shift to 2wd, I start having problems.
Situation:
Driving in 4wd, come to a stop, put transfer case in 2wd, backup about a yard or two to unlock auto-locking hubs. Put in 1st and pull forward and get a grinding sound from front end, and a big clunk and shake once a second or so. Stop, put it in reverse and get the same big clunk and shake once a second or so. If I go back into 4wd hi, I have no problems. If I pull out in 4wd hi, then clutch and put the transfer case into 2wd, I have no problems. As soon as I stop though, if I back up at all, be that rolling backwards with gravity, or drive backwards in reverse, I start to get the clunk and shake, then when I pull forward I get the clunk and shake plus the grinding again.
When I got home, I found some jerk had taken my parking space, which pissed me off (straw that broke the camel's back so to speak) and I locked up the brakes, slammed it into reverse, smoked the rears slightly (I was in 2wd at the time) and pulled into another space. I realized I hadnt had any clunking or shaking, in either direction. So I backed out and drove around the block a couple times, at each stop I put it in reverse, and tried to generate the problem from earlier, but it has not returned. I'm somewhat leary of putting it in 4wd again to see if whatever it was is no longer causing a problem, since 2wd is working currently.
Anyone have any ideas, comments, recommendations?? Any help is greatly appreciated. I'm new to pickup trucks, so I don't know too much about how the transfer case, front hubs, etc, actually operate; but I am a seasoned Nissan veteran and good mechanic, so I just hope you guys can help me.
Sorry this was so long, but I wanted as much info as possible out there.
I have EXACTLY the same problem. Usually manifests after reversing too, but is unpredictable....
Your 4X4 is not fully unlocking. The clunking/grinding is one hub trying to remain engaged while the other isn't. I think this can be resolved by lubricating everything and possibly repacking the front bearings. Mine hung up last winter once. I started and drove in 4X4 for 1/4 mile while it was about -4 and disengaged going up a small hill. Rolled back 10 feet and thought the front passenger side truck was going to self destruct at 35MPH. I think i used a 6 or #6 allen wrench to unbolt the autolocking hub assembly, cleaned everything i could reach and stuffed it full of grease. No problem since.
If this happens to you STOP and re-engage the 4x4. Drive a little and try to disengage it again. Your violent reverse doubtless disengaged the mechanism which is just some cheesy springs. They are dirty/dry and hanging up.
Linear Mode
