94 Nissan Pickup Clunk and stop

I have a '94 Nissan Pickup XE, the base model with a 5-speed manual. As i was getting onto the freeway the other day, I shifted into either 3rd
or 4th gear and dropped the clutch. as soon as i did this, i heard and felt a large clunk. After that i try to speed up, but nothing happens other than the engine revving up. So i pull over to the side of the road, and i put it in first gear. I starty to let out on the clutch and it connects very shakey for a matter of about a second, then abruptly does the clunk again. So then i put it in 2nd gear and do the smae thing. same thing happens. so i put it in 3rd, same thing again.
    As a result, i figured that the clutch either straight up broke, or, a couple of the bolts holding the pressure plate to the flywheel possibly broke. So i pull the tranny. and everything looks good, other than a little wear on the clutch. So then i bench shift the tranny, works great like it had before. so then i pulled the rear end, brought it to a very reputable drivetrain specailist along with the tranny. They pull it all apart, everything in the rear-end looks great, and the tranny had a little wear, but nothing major and nothing broken.
    Has anybody had this same problem? I have been looking in nissan newsgroups, and there are no other similar problems. Both I, and the drivetrain specialists are at a complete loss.
Thank you, James San Diego, CA
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I would go ahead and replace the clutch disc, pressure plate and release bearing (check the pilot bushing if applicable) since you have everything apart (looking good or not...) and go from there. That is VERY interesting...
I wouldn't think it to be anything in the rear axle as you hadn't started to move when it happened on the side of the road plus it happened as you shifted. I suspect the problem to be limited to the clutch assembly/transmission. Make sure you replace it with a genuine Nissan pressure plate/clutch/release bearing (and maybe pilot bushing, put a *tiny* amount of grease with your pinky on it after installing the new one, as I say, if your model uses one) and go from there.
Wil

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Truck wrote:

I'd also be looking at your master and slave clutch cylinders.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.