Can you check and see what plant your truck was made at? Just post the 11th digit of your VIN The eleventh symbol is a letter or number indicating the assembly plant: A=Lakewood, B=Baltimore, F=Flint, J=Janesville, S=St. Louis, V=Pontiac, 1=Oshawa, Canada, 3=Detroit, 4=Scarborough, Canada, 7=Lordstown. Trying to figure out if all of the crewcabs were made at the same plant, possibly partial reason for none of them having serpentine belt set ups like the burbans and blazers of the same years. Mine is a 1991 Crew Cab 454, 4x4 assembled in Flint Thanks!