Buy a service manual made by haynes for your year you can usually read them at advance auto without buying them or try website for autozone.com and look up part then look for link to repair info and wit will explain complete alldata repair info which is the best info on the market that the shops use.
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Axle Preload and Backlash Specifications
8.0 Axle Preload and Backlash Specifications
Pinion Bearing Preload, New Bearings
15-30 lb in
Pinion Bearing Preload, Used Bearings
10-20 lb in
Pinion and Differential Case Bearing Preload, New Bearings
30-55 lb in
Pinion and Differential Case Bearing Preload, Used Bearings
25-45 lb in
The 99 Jeep Grand Cherokee was prone to bad diff bearings because they
changed the plant where they were made. The new plant used inferior
materials. The only way to fix it is to replace and set the diff
check the differential fluid in the rear differential. if the fluid is low, add fluid and see if the noise is still there, if the fluid level is ok see if the fluid appears metallic, if it is metallic looking or excessively thick it would be a good idea to have the bearings checked out. i am in the process of rebuilding a front differential on a 98 jeep grand cherokee for the same problem. the bearings inside the differential on the carrier and pinion gear were worn out causing a humming noise. if the wear is excessive the gears might also need to be replaced
If you removed the pinion and only replaced one of the bearings that was a mistake. You need to replace both at the same time. Also since it is a Dana differential you should have replace the crush sleeve also as this set the correct preload on the pinion bearings.
Drive the car in a parking lot and make left and right hand turns.
If the noise goes away on either turn then the problem is a front hub bearing.
If the noise is still there, it could be possible front differential bearings.