Hummer H2. Manual — part 2701

64. Using J 45756 , install the rear output shaft seal. See Special Tools and Equipment .

Fig. 152: Drain Plug & Fill Plug
Courtesy of GENERAL MOTORS CORP.

65. Apply pipe sealant GM P/N 12346004 (Canadian P/N 10953480) to the threads on the drain plug and fill

plug.

66. Install the drain plug and the fill plug.

2004 Hummer H2

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

Tighten: Tighten the drain plug and fill plug to 25 N.m (18 lb ft).

Fig. 153: Using J 43484 & J 8092 To Install Transfer Case Output Seal
Courtesy of GENERAL MOTORS CORP.

67. Using the J 43484 (2) and the J 8092 (1), install the front output shaft seal. See Special Tools and

Equipment .

2004 Hummer H2

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

Fig. 154: Installing Front Input Shaft Seal By Using J 42738
Courtesy of GENERAL MOTORS CORP.

68. Using the J 42738 , install the front input shaft seal. See Special Tools and Equipment .

69. Remove the transfer case from the J 45759 . See Special Tools and Equipment .

2004 Hummer H2

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

DESCRIPTION AND OPERATION

TRANSFER CASE DESCRIPTION AND OPERATION

The Borg Warner (BW) model 4484 NR4 transfer case is a two-speed, full time 4WD, transfer case. The
transfer case has an external planetary type differential, which has two different sets of pinion gears. The
planetary differential provides a 40/60 torque split front/rear full time. This means the front and rear propeller
shafts are constantly being driven for maximum traction in all conditions. A high/low planetary carrier assembly
provides the high and low ranges, which is a 6-pinion gear, sun gear, and annulus gear arrangement giving a
2.64 low range reduction ratio.

The BW 4484 case halves are high-pressure die-cast magnesium. Ball bearings support the input shaft, the front
output shaft, and the rear output shaft. A needle roller bearing is located inside of the input shaft gear to support
the front of the mainshaft. The rear of the mainshaft is supported by a bronze bearing inside the rear output
shaft. The transfer case requires DEXRON III ATF Fluid GM P/N 12346143 (Canadian P/N 10952622), which
is red in color. An oil pump pumps the fluid through the mainshaft oil gallery to the gears and bearings.

Transfer Case Shift Control Switch

2004 Hummer H2

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2