Buick Encore: Description and operation

Transfer case identification

Fig. 71: Transfer Case Primary Identification Label

The transfer case primary identification label (1) is located on the rear extension housing. The transfer case secondary identification stamping (2) is located on the bottom of the main housing.

Transfer Case Primary Identification Label

Fig. 72: Transfer Case Primary Identification Label Contents

1. GM Part Number
2. Broadcast Code
3. Supplier Manufacturing Location
4. VPPS
5. Broadcast Code / Trace Code

Transfer Case Secondary Identification Stamping

Fig. 73: Transfer Case Secondary Identification Stamping

1. GM Part Number
2. Build Hour
3. Daily Build Count
4. Day of the Year
5. Model Year
6. BOM Code

TRANSFER CASE DESCRIPTION AND OPERATION

General Description

Fig. 74: Transfer Case

The transfer case is positioned in the right side of the vehicle and bolted to the transmission via an adapter plate.

The primary function of the transfer case is to receive power from the transmission and transfer it using helical and hypoid gear sets through the propeller shaft to the rear differential. The transfer case housing, rear extension shaft housing, and rear output shaft housing are cast aluminum design.

External Components

Fig. 75: Transfer Case Assembly Components

1. Rear Output Flange
2. Vent House Assembly
3. Intermediate Drive Shaft - Right Axle Shaft
4. Oil Fill Plug
5. Oil Drain Plug
6. Intermediate Drive Shaft - Transmission Input
7. Input Shaft - Transmission Input
8. Vent Hole - Front wheel drive input shaft bearing retainer front seal
9. Vent Hole - Front wheel drive input shaft bearing retainer rear seal

Internal Components

Fig. 76: Internal Components

The OD splines of the input shaft (7) are mated to the ID splines of the transmission output shaft. Power and torque are transferred from the input shaft (7) to the idler shaft (4) via a helical gear set. A second gear set, the hypoid gear set (3) transfers power and torque from the idler shaft to the rear output shaft and flange (1). The propeller shaft is mated to the rear output shaft flange providing power and torque to the rear drive axle. The OD splines of the intermediate drive shaft (6) mate to the ID splines of the transmission carrier assembly and provide power and torque to the right front axle shaft and wheel.

Gear tooth clearances and bearing preloads are maintained by shims located behind the bearing races. The housings, internal gears, and bearings are not serviceable components. If housing, gear set, or bearing damage occurs, the assembly must be replaced.

1. Rear Output Flange
2. Rear Output Shaft Seal
3. Rear Output Shaft
4. Idler Shaft
5. Front Wheel Drive Input Shaft Bearing Retainer Front Seal
6. Intermediate Drive Shaft-to-Transmission Splines
7. Input Shaft
8. Front Wheel Drive Input Shaft Bearing Retainer Rear Seal
9. Intermediate Drive Shaft
10. Front Wheel Drive Intermediate Drive Shaft Bearing Seal
11. Front Wheel Drive Intermediate Drive Shaft Seal

Transfer Case Service Assembly

Fig. 77: Transfer Case Service Assembly

New transfer case assemblies are shipped with the intermediate drive shaft (IDS) assembly (2) partially installed and retained to the transfer case assembly by a shipping clip (1). The shipping clip is to be removed and discarded. Prior to removal or installation of the IDS shaft, seal protector DT-50937 (3) must be installed to avoid front wheel drive intermediate shaft seal damage

New product information

Interim Model Year Design Changes

The purpose of New Product Information is to document, important product changes which occur either model year-to-model year or interim model year.

Changes may include one or more of the following items:

• Specification Changes
• New sealants and/or adhesives
• Disassembly and assembly procedure revisions
• Mechanical and diagnostic procedure revisions
• New special tools required
• Interim Model Year Design Changes
• A component comparison from the previous model year

SPECIAL TOOLS AND EQUIPMENT

SPECIAL TOOLS

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