Ford F150 Pickup. Instruction - part 516

Fig. 45: Removing Rear Axle Pinion Flange 
Courtesy of FORD MOTOR CO. 

Installation 

1. Lubricate the rear axle pinion flange splines with rear axle lubricant. 

NOTE:

Disregard the scribe marks if a new rear axle pinion flange is being 
installed.

 

2003 Ford Pickup F150 

2003 DRIVELINE/AXLES Rear Drive Axle/Differential - Ford 10.25-inch - F150 Pickup

  

Fig. 46: Aligning Rear Axle Pinion Flange With Drive Pinion Shaft 
Courtesy of FORD MOTOR CO. 

2. Align the rear axle pinion flange with the drive pinion shaft.  

3. With the drive pinion in place in the rear axle housing (4010), install the rear axle pinion flange using the 

special tool. 

 

2003 Ford Pickup F150 

2003 DRIVELINE/AXLES Rear Drive Axle/Differential - Ford 10.25-inch - F150 Pickup

  

Fig. 47: Installing Rear Axle Pinion Flange 
Courtesy of FORD MOTOR CO. 

4. Position the new pinion nut. 

 

2003 Ford Pickup F150 

2003 DRIVELINE/AXLES Rear Drive Axle/Differential - Ford 10.25-inch - F150 Pickup

  

Fig. 48: Installing Pinion Nut 
Courtesy of FORD MOTOR CO. 

CAUTION: Under no circumstances is the pinion nut to be backed off to reduce 

preload. If reduced preload is required, a new collapsible spacer and 
pinion nut must be installed.

NOTE:

Remove the suitable pinion flange holding tool while taking preload 
readings.

 

2003 Ford Pickup F150 

2003 DRIVELINE/AXLES Rear Drive Axle/Differential - Ford 10.25-inch - F150 Pickup