One problem related to transmission slip out of gear has been reported for the 1998 Chevrolet Suburban. The most recently reported issues are listed below.
Stopped on roadway to pick up a part that had fallen out of the truck traveling in front of me. I put my 1998 chevy Suburban in park and popped the rear hatch. I remember hearing the rear hatch click and now realize that the hatch won't release unless the truck is in park. I walked behind my truck to pick up the part. After I picked it up, I was knocked down by the force of my truck. The truck must have slipped out of gear after I'd put it in park. I recently read about a similar incident in the local newspaper, where this happened to someone else with this type of vehicle. The truck rolled over me, and I was trapped under it. A man came and drove the truck off me. I suffered a deep cut to the back of my head, the meat was ripped off my leg, I shattered the t-12 vertebra in my back and the disks above and below were compressed.