I have a '97 ZRT6
*(w/o reverse) & last winter I blew the same bearing. Speedometer broke & 55 miles later so did the bearing! *
*The bearing (original) I removed was sealed therefore the grease never made it to the bearing. *AC has a REPLACEMENT bearing that allows grease from the zerk to lubricate the bearing. *The lead-time from AC was too long so I went to the local NAPA & they hooked me up with a replacement that also allowed grease to flow into the bearing. *The whole replacement took me a little more than 5 hours, it was my first time & I didn't work at a blistering pace. It's not a hard job, just requires patients. *And when it's done, you will know it is done right! Here is how I removed the driveshaft, as with any job there is more than one way to do it.
-Remove the rear suspension.
-Remove the drain plug -- drain the oil.
-Remove the gearcase cover.
-Loosen the external chain tensioner.
-Remove one of the cotter pins holding the spring assembly.
-Loosen the nut holding the driven sprocket.
-Remove the chain & driven sprocket. *(You may have to remove the drive sprocket too)
-Remove the bearing carrier behind the driven sprocket (three nyloc nuts).
-There should be an O-ring around the outside of the bearing.
-Remove the speedometer adapter (three nyloc nuts).
-Inside the tunnel-the three bolts are carriage style & hold the bearing retainers to the tunnel.
-From the speedometer adapter side -- push or tap the driveshaft towards the right (rider's right). *This will unseat the chaincase bearing.
-Remove the chaincase bearing. *There should be an O-ring between the bearing and the shaft.
-Keep pushing (or tapping) the driveshaft toward the right. *Until the left bearing & driveshaft are out of the mounting hole in the tunnel.
-Remove the driveshaft by tilting it & pull it out of the tunnel.
Removing the bearing is easy as long as you know which way "clockwise" is. *The locking collar works like an eccentric. *The counterbore in the locking collar is slightly off-center. *When it is turned CCW it tightens, CW loosens it.
-Loosen the setscrew on the locking collar.
-There is an unthreaded hole on the collar--insert a punch and drive it clockwise. *(Counterclockwise will tighten the collar)
OK put the disassembly machine in reverse & assemble it with new parts!