Hummer H1 Service Manual page 348

___________________________________________
®
TRANSFER CASE DESCRIPTION
Hummer vehicles are equipped with the New Process Gear,
model 242 transfer case. If you have questions about the trans-
fer case that are not answered by this section, you can call the
Transfer Case Hotline at 1-800-945-4327 for more informa-
tion.
The 242 is a full-time, 4-wheel drive transfer case with three
operating ranges plus a neutral position. Operating ranges are
High (H), Low (L), and High Lock (HL). Low range (L) posi-
tion provides a 2.72:1 reduction ratio for greater low speed,
off-road torque capability.
LOW RANGE PLANETARY
FRONT RETAINER
INPUT
GEAR
ANNULUS
GEAR
FRONT CASE
COOLER TUBE
YOKE
FRONT OUTPUT SHAFT
05745159
RANGE SLEEVE
MODE
SLEEVE
DRIVEN SPROCKET
Figure 5-66: Model 242 Transfer Case
Transmission/Transfer Case
The transfer case extension, bearing retainer, rear case, and
front case are all aluminum castings. The front and rear output
drive sprockets are interconnected by a drive chain
(Figure 5-66). A differential in the transfer case, allows the
front/rear output shafts to run at differing speeds. This permits
full-time, 4-wheel drive operation in high range. The 242 is
also equipped with an internal-mount oil cooler.
DIFFERENTIAL
DRIVE SPROCKET
SPEEDOMETER
TONE WHEEL
DRIVE CHAIN
REAR CASE
5-149
MAINSHAFT
EXTENSION
HOUSING
REAR
RETAINER