Last one built was in 91 though there as some aftermarket convertions out there it is not a easy conversion and it requires a left side drive front axle because of transfer case design and not a right hand side drive like GM trucks through 91. Please note that while GM came out with new style P/U in 88 the Blazer, Suburban and 3500 trucks were still built on the old style chassis thru 91 just like when Silverado came out in 99, GM still used the older classic style chassis through
2000 for 3500 series trucks.----------------- TheSnoMan.com