I'm sure that I need a new transmission mount. Whenever I put shifter from Drive to Reverse, I would hear this crunching sound and the whole car would jerk forward. So the transmission mount could be on its way out. I went to JR Nissan website to find the mount. There are a few listing, I'm not sure which one is right. Anyone have the part number for it? I have a '96 SE automatic. Thanks.

 

There's an Ebay auction right now for one (or more) of them. check it out.

 

Why do you think it's the tranny mount and not the front or rear motor mount?

With the parking brake engaged, place the vehicle in gear and apply a
light load with the throttle. The motor will shift in the direction
opposite the bad mount. To check the other side, use reverse gear.

Just my $0.02