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