Ford F150 Pickup. Instruction - part 621

Fig. 102: Checking Backlash 
Courtesy of FORD MOTOR CO. 

Backlash Within Specification 

15. Remove the bearing caps and bolts. 

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To establish differential bearing preload, increase both left and right shim sizes by the specification 
shown in the illustration.  

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Using a special tool, make sure the differential bearing shims are fully seated and the assembly 
turns freely. 

 

2003 Ford Pickup F150 

2003 DRIVELINE/AXLES Rear Drive Axle/Differential - Ford 9.75-inch - F150 Pickup

  

Fig. 103: Seating Differential Bearing Shim 
Courtesy of FORD MOTOR CO. 

16. Install the bearing caps and bearing cap bolts. 

 

2003 Ford Pickup F150 

2003 DRIVELINE/AXLES Rear Drive Axle/Differential - Ford 9.75-inch - F150 Pickup

  

Fig. 104: Tightening Bearing Cap Bolts 
Courtesy of FORD MOTOR CO. 

17. Using the special tool, verify the backlash. 

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The specification shown in the illustration is the total allowable range. For the preferred range, 
refer to SPECIFICATIONS .  

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For further adjustments, Refer to DRIVELINE SYSTEM - GENERAL INFORMATION . 

 

2003 Ford Pickup F150 

2003 DRIVELINE/AXLES Rear Drive Axle/Differential - Ford 9.75-inch - F150 Pickup

  

Fig. 105: Checking Backlash 
Courtesy of FORD MOTOR CO. 

18. Install the axle shafts. For additional information, refer to AXLE SHAFT . 

19. Install the differential housing cover and tighten the differential housing cover bolts.  

REMOVAL & INSTALLATION 

AXLE HOUSING 

Removal & Installation 

1. Remove the axle shafts. For additional information, refer to AXLE SHAFT . 

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Wire the calipers aside. Do not remove the brake lines from the calipers.  

2. Mark the driveshaft flange and pinion flange for correct alignment during installation. 

NOTE:

The differential housing cover must be installed within 15 minutes of 
application of the silicone, or new sealant must be applied. If possible, 
allow 1 hour before filling with lubricant to make sure the silicone sealant 
has cured correctly.

 

2003 Ford Pickup F150 

2003 DRIVELINE/AXLES Rear Drive Axle/Differential - Ford 9.75-inch - F150 Pickup