One problem related to door has been reported for the 1998 GMC Sierra. The most recently reported issues are listed below.
We had the two rear windows open travling for app 36miles -55mph. Thangot on i75 south app25miles -70mph when the window closed creating a presure sounding pop. Glass spred through the truck spraying glass on the passager side rear seat and down the side of the truck. If a child or passager were in that seat it could have been a real safety proplem. Some may try to say it was a stone but we were in the left lane going south and there we no cars next to us. The sound was a presure sound. I feel this is a defect and if it happened to us it will happen to others.