The seventh generation of Suburbans are noted for having only a single drivers side door and two passenger-side doors. They were available in both 2WD and 4WD models. Available engines included the V6 (e.g., Chevrolet 292-cubic-inch I6, and GMC 305 cubic inch V6), and small-block V8s of the current model year (e.g., 283, 307, 327, 350, 400-cubic-inch V8s.) For the first time, a three-quarter ton version was available.
This series would also be the last to offer C-10 & C-20 panel truck models for commercial purposes, the last year being 1970.
1971 saw the introduction of disc brakes on the front wheels, and 1972 was the last year for coil-spring rear suspension on 2WD models. 1972 also introduced a smaller housing for the rear seat air conditioning (a unit that ran the full length of the roof had been available since 1967). The Comfort-Tilt steering wheel became optional in 1971.
One of the Suburbans pictured here has been modified for emergency responder use.
Source: Wikipedia, 2013