Two problems related to differential unit have been reported for the 1998 Chevrolet Suburban. The most recently reported issues are listed below.
My 1998 1500, 2 wd chevy Suburban lost a bolt in the differential. Bolt held a pin, when the pin worked loose, the rearend locked up, putting my car into a spin. Fortunately I was only going 25 mph, and no one was hurt.
Differential serviced, causing rear end vibration. Mjs.