Although the GMT400 platform was introduced in the spring of 1987 as a 1988 model, the K5 Blazer, Suburban, and crew-cab trucks retained the earlier platform until 1991.
Walaupun GMT400 platform diperkenalkan pada musim panas 1987 sebagai model 1988, K5 Blazer, Suburban, dan truk kru kabin tetap mempertahankan platformnya sampai tahun 1991.