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Differential and Driveline » 8 1/4 And 9 1/4 axle » Description and operation
9 1/4 Axles

DESCRIPTION

The 9 1/4 Inch axle housings consist of a cast iron center section with axle tubes extending from either side. The tubes are pressed into and welded to the differential housing to form a one-piece axle housing (Fig. 3).

The axles have a vent hose to relieve internal pressure caused by lubricant vaporization and internal expansion.

The axles are equipped with semi-floating axle shafts, meaning vehicle loads are supported by the axle shaft and bearings. The axle shafts are retained by C-locks in the differential side gears.

The removable, stamped steel cover provides a means for inspection and service without removing the complete axle from the vehicle.

The axle has a date tag and a gear ratio tag. The tags are attached to the differential housing by a cover bolt.

The rear wheel anti-lock (RWAL) brake speed sensor is attached to the top, forward exterior of the differential housing. A seal is located between the sensor and the wire harness connector. The seal must be in place when the wire connector is connected to the sensor. The RWAL brake exciter ring is press-fitted onto the differential case against the ring gear flange.

The differential case is a one-piece design. The differential pinion mate shaft is retained with a threaded pin. Differential bearing preload and ring gear backlash are set and maintained by threaded adjusters at the outside of the differential housing.

Pinion bearing preload is set and maintained by the use of a collapsible spacer.

Axles equipped with a Trac-Loky differential are optional. A Trac-Loky differential has a one-piece differential case, and the same internal components as a standard differential, plus two clutch disc packs.

Fig. 3 9 1/4 Axle Fig. 3 9 1/4 Axle

1 - HUB

2 - AXLE SHAFT

3 - VENT FITTING

4 - DIFFERENTIAL HOUSING

5 - CUP

6 - PINION FRONT BEARING CONE

7 - NUT

8 - WASHER

9 - COMPANION FLANGE

10 - SEAL

11 - AXLE SHAFT

12 - HUB

13 - STUD

14 - BEARING CUP

15 - PINION REAR BEARING CONE

16 - DIFFERENTIAL BEARING

17 - ADJUSTER

18 - LOCK

19 - BOLT

20 - BEARING CAP

21 - CAP BOLT

22 - BEARING CUP

23 - THRUST WASHER

24 - SIDE GEAR

25 - C-LOCK

26 - DIFFERENTIAL POSITIONS

27 - THRUST WASHER

28 - COVER

29 - PLUG

30 - COVER BOLT

31 - WASHER

32 - CLIP

33 - SIDE GEAR

34 - THRUST WASHER

35 - DIFFERENTIAL BEARING CONE

36 - C-LOCK

37 - BOLT

38 - LOCK

39 - BEARING CUP

40 - ADJUSTER

41 - BEARING CUP

42 - BOLT

43 - PINION MATE SHAFT

44 - EXCITER RING

45 - DIFFERENTIAL CASE

46 - RING GEAR BOLT

47 - RING GEAR

48 - PINION

49 - PINION GEAR DEPTH SHIM

50 - BEARING PRELOAD COLLAPSIBLE SPACER

51 - SEAL

52 - AXLE SHAFT BEARING

53 - AXLE SHAFT TUBE

54 - AXLE TUBE

55 - AXLE SHAFT BEARING

56 - SEAL

AXLE IDENTIFICATION

The axle differential cover can be used for identification of the axle and (Fig. 4). A ratio tag is attached to the differential cover.

Fig. 4 Differential Cover 9 1/4 Inch Axle Fig. 4 Differential Cover 9 1/4 Inch Axle

1 - DIFFERENTIAL COVER

2 - RATIO TAG

3 - PUSH-IN FILL PLUG

OPERATION

The axle receives power from the transmission/ transfer case through the rear propeller shaft. The rear propeller shaft is connected to the pinion gear which rotates the differential through the gear mesh with the ring gear bolted to the differential case. The engine power is transmitted to the axle shafts through the pinion mate and side gears. The side gears are splined to the axle shafts.

    More about «Description and operation»:

    8 1/4 Axle

    9 1/4 Axles

    Lubricant

    Standard differential

    Trac-loky differential

    Dodge Durango Service Manual / Differential and Driveline / 8 1/4 And 9 1/4 axle / Description and operation / 9 1/4 Axles

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