Check the u-joints in the drive shaft. Are they binding up? Work the u-joints around by hand with the driveshaft out. They should turn smoothly and uniformly-any looseness or stiffness in any portion of travel is a bad u-joint. Not sure if u-joints on Nissans can be replaced, or if you have to buy a new or used driveshaft with the u-joints. At one time u-joints were not replaceable, but some aftermarket suppliers were trying to change that. You would have to check at a parts store.
Check the frame piece that the carrier bearing and bracket sits on. Is it still straight and true? Not bent from being hit from underneath (like running over a large boulder)?
Is the bearing still good? What is getting busted, the bearing itself, or the rubber insulator ring, or the metal bracket that holds it all in place? Unless there is a problem in the rear differential (like locking up), it is likely a mis-alignment of the bracket or frame it sits on, or a seriously bad u-joint, or a seriously bent drive shaft.
SOURCE: help on how to install u-joints in my 1998 gmc sonoma, two piece shaft, and center bearing
if you dont have the proper tools its best too just pull the drive shaft and take it too autozone and have them press the new ones in!!!
SOURCE: Remove the Center Support Drive Shaft Bearings
use a cutting wheel and cut through the bearing as far as you can without damaging the drive shaft.Then get a big hammer and a chisel drive the chisel into the cut and break the bearing.
SOURCE: 1999 chevy silverado z71 5.3 ujoints just got
i would suspect bad driveshaft hanger bearing - to confirm, jack up back end of truck and hold up with jack stands. have someone in the truck to accelerate to the speed where you hear the noise, listen for the noise - a stethescope is very useful for this. good luck!
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