TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 40 of 481
TM 9-2320-272-10
Change 2
1-23
Table 1-9.
Automatic Transmission Data (Contd).
Table 1-9A.
Maximum Safe Operating Speeds.
TRANSMISSION DRIVING RANGE SELECTION
Maximum Operating Speeds
W/Transfer Case
Range
Condition
M939
M939A1 and
Selection
Series
M939A2 Series
In High
In Low
In High
In Low
R (reverse)
Easy grades clear of traffic
5 mph
5 mph
with ground guide
(8 km/h)
(8 km/h)
N (neutral)
————
1-5 (drive)
Good roads, grades, traffic
55 mph
22 mph
55 mph
26 mph
conditions
(80 km/h) (35 km/h)
(80 km/h)
(42 km/h)
1-4 (fourth)
Moderate grades, traffic
43 mph
17 mph
50 mph
20 mph
restricted speed limits
(69 km/h) (27 km/h) (80 km/h) (32 km/h)
1-3 (third)
Moderate grades, heavy traffic,
33 mph
13 mph
38 mph
16 mph
restricted speed limits
(53 km/h) (21 km/h) (61 km/h) (26 km/h)
1-2 (second)
Steep grades, heavy traffic,
25 mph
10 mph
29 mph
12 mph
rough terrain
(40 km/h) (16 km/h) (47 km/h) (19 km/h)
1 (first)
Starting heavy loads, extreme
12 mph
5 mph
15 mph
6 mph
grades, rough terrain
(19 km/h)
(8 km/h)
(24 km/h) (10 km/h)
Terrain
W/ABS
W/O ABS
Highway/secondary roads
55 mph (88 km/h)
40 mph (64 km/h)
Cross country/off-road
40 mph (64 km/h)
35 mph (56 km/h)
Sand/snow
25 mph (40 km/h)
25 mph (40 km/h)
Ice/road emergencies
5-12 mph (8-19 km/h)
5-12 mph (8-19 km/h)
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