I was just thinking Gen-1 Gen-2 Gen-3
here we go...found this from google
"There are 11 generations of Suburban, and each one has its significance. The first (1933-1934) was, well, the first. The second (1935-1940) was the first to actually be called "Suburban". The third generation (1941-1947) shared its dramatic "art deco" styling with its contemporary Chevy trucks. Fourth-generation Suburbans (1947-1955) featured Chevy's "advance design" and was the first Suburban to offer an automatic transmission (a two-speed Powerglide was available in GMC versions in 1953; 1954 for Chevys). The first factory V-8 was installed in the fifth-generation Suburban (1955-1959), and remains a fixture until this day. Sixth-generation Suburbans were based on the new C/K truck platform, and used the same model designation to designate two (C) or four (K) wheel drive; it was also the first Suburban with an independent front suspension, albeit only on two-wheel drive models.
By the seventh generation (1967-1972), the seeds were being sown to make the Suburban a proper four-door wagon, but GM only went halfway, giving the passenger side two doors, but only one on the driver's side. The eighth-generation lasted the longest of any Suburban (1973-1991), and boasted four real doors at last. The ninth-generation (1992-1999) was considerably more civilized than its predecessors, a trend that continued as the Suburban rode the rising SUV tide through the tenth (2000-2006) and the current 11th generation (2007-present). The tenth generation version of the GMC wagon lost the Suburban name in favor of Yukon XL, bringing it in line with the rest of GMC's full-size SUV naming convention. In 2003, Cadillac even cashed in on the full-size mega-hauler craze with the Suburban-based Escalade EXT."
