TM 9-2320-280-10 Table 1-11. Maximum Vehicle Operating Speeds (3L80 Transmission) Transmission Transfer Case Range Selection Range Selection "L" Low Range "H" High Range "H/L" High Lock Range "R" (reverse) 11 mph 29 mph 11 mph (18 kph) (47 kph) (18 kph) "D" (drive) 27 mph 55 mph 55 mph (43 kph) (88 kph) (88 kph) "2" (second) 19 mph 48 mph 48 mph (31 kph) (77 kph) (77 kph) "1" (first) 11 mph 29 mph 29 mp (18 kph) (47 kph) (47 kph) Table 1-12. Maximum Vehicle Operating Speeds (4L80-E Transmission) Transmission Transfer Case Range Selection Range Selection "L" Low Range "H" High Range "H/L" High Lock Range "R" (reverse) 11 mph 29 mph 11 mph (18 kph) (47 kph) (18 kph) “ D “ (overdrive) 27 mph 55 mph 55 mph (43 kph) (88 kph) (88 kph) “D” (drive) 27 mph 55 mph 55 mph (43 kph) (88 kph) (88 kph) “2”  (second) 19 mph 48 mph 48 mph (31 kph) (77 kph) (77 kph) "1" (first) 11 mph 29 mph 29 mph (18 kph) (47 kph) (47 kph) 1-29