One problem related to body has been reported for the 1998 Chevrolet Express 3500. The most recently reported issues are listed below.
We currently own a 1998 and a 2000 express van and we have the same problem on both of them, the passenger side doors (the 'double doors') are seizing up. We tried to lubricate them but it hasn't helped any. The one door on the 1998 has gotten so bad that we can't even open the left hand side door because it is so hard to shut and it has already started to become out of alignment. I believe this could be a safety hazard as we have 6 children, 3 of which have to sit in the back seat and if there is an emergency we wouldn't be able to get the door open to get them out faster. We have had a dealer drill holes in the hinges to lubricate them, but this seems to be a temporary and eventually ineffective fix to a major problem.