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Ring-to-Drive Pinion Gear Backlash

With differential bearing preload set, remove inspection hole cover, mount dial indicator in one cover bolt hole, and check ring-to-pinion gear backlash. Check ring gear tooth contact pattern.

NOTE: Refer to Rear Axle Gear Tooth Patterns in this section.

While maintaining established shim thickness, move shims behind carrier bearing outer cones, from one side to the other as necessary, to obtain proper contact pattern. After setting backlash, complete differential reassembly procedure.

Fig 1: Sectional View Showing Ring Gear Backlash Shim Locations
G09329629Courtesy of BMW OF NORTH AMERICA, INC.
AXLE ASSEMBLY SPECIFICATIONS

Application Specification
Wheel Bearing End Play .002-.004" (.05-.10 mm)
Differential Pinion Rotating Torque (At Flange)
  Standard
    2 Pinion Type 8-15 ft. lbs. (1.0-2.0 mkg)
    4 Pinion Type 11-18 ft. lbs. (1.5-2.5 mkg)
  Limited Slip
    Maximum 54 ft.lbs. (7.5 mkg)
    Minimum 36 ft.lbs. (5 mkg)
Axle Drive Flange End Play .002-.004" (.05-.10 mm)
Ring-to-Pinion Gear Backlash .002-.004" (.05-.10 mm)
Ring Gear Bearing Preload
  Without Seal (Max.) 28 INCH lbs. (30 cmkg)
  With Oil Seal (Max.) 30 INCH lbs. (32 cmkg)
Limited Slip Clutch Assembly
  Case-to-Plate End Play .004-.016" (.10-.40 mm)
Differential Gear Backlash .001 2-.004" (.03-.10 mm)
TIGHTENING SPECIFICATIONS

Application Ft. Lbs. (mkg)
Housing Cover Bolts 15-18 (2-2.5)
Ring Gear-to-Carrier Bolts 121-143 (16.8-19.8)
Drive Pinion Flange Nut 111 (15)
Drive Shaft-to-Drive Flange Bolts 65-72 (9-10)
Drive Shaft-to-Axle Flange Bolts 44-48 (6.1-6.8)
Differential Carrier Cover Bolts 15-18 (2-2.5)
Axle Flange Nut 295-332 (40-45)
Final Drive-to-Rear Axle Carrier 53-58 (7.3-8.1)
Final Drive-to-Rubber Mount 53-58 (7.3-8.1)