The early 80's had stock 6.2's with 700R4 automatic tranmissions. My 80's 1500 Suburban has that and 3.73 rear end. Gets excellent fuel mileage, 22 mpg on freeway trips. Not much for towing or fast acceleration, but 20 mpg around town in a full size Suburban is ok with me.
83 C10 Suburban, Silverado, 6.2, 700R4, 3.73, 31-10.50R15
82 C30 Crew Cab dually, 6.2, Banks, Th400, 4.10, Gear Vendors, 235-85R16
83 C20 Suburban, Sierra Classic, 6.2, 700R4, 4.10, custom paint, 285-50R20
95 Yukon, 6.5, 4L80E, 3.42, 265-50R20
73 GMC Astro 95, 8V71, 10 speed Roadranger, 110" WB, 6 each 11R24.5