Ford F150 Pickup. Instruction - part 640

The plant code denotes a particular axle design, a specific ratio, and if it is a conventional or limited slip 
(Traction-Lokohm) type. In addition, the plant code will not change as long as that particular axle assembly 
never undergoes an external design change. If, however, an internal design change takes place during the 
production life of the axle and that internal change affects parts interchangeability, a dash and numerical suffix 
is added to the plant code. 

Note that the plant code in the front and rear axle identification tag illustrations is similar, but the illustration 
denoting interchangeability affected internally shows the addition of the suffix. This means that as an assembly 
both axles are interchangeable; however, internally they are different. Therefore, each requires different internal 
parts at the time of repair. 

DIAGNOSIS AND TESTING 

DRIVELINE SYSTEM 

Special Tool(s) 

 

2003 Ford Pickup F150 

2003 GENERAL INFORMATION Driveline System - General Information - F150 Pickup

  

Fig. 5: Identifying Driveline System Special Tool(s) (1 Of 3) 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 GENERAL INFORMATION Driveline System - General Information - F150 Pickup

  

Fig. 6: Identifying Driveline System Special Tool(s) (2 Of 3) 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 GENERAL INFORMATION Driveline System - General Information - F150 Pickup

  

Fig. 7: Identifying Driveline System Special Tool(s) (3 Of 3) 
Courtesy of FORD MOTOR CO. 

Inspection and Verification 

Certain axle and driveline symptoms are also common to the engine (6007), transmission, wheel bearings, tires, 
and other parts of the vehicle. For this reason, be sure that the cause of the trouble is in the axle before 
disassembling, adjusting or repairing the axle. Refer to NOISE, VIBRATION & HARSHNESS - F150 
PICKUP . 

Certain driveshaft vibration symptoms are common to the front accessory drive (FEAD), the engine, 
transmission or tires. Be sure the cause is the driveshaft before repairing or installing a new driveshaft. Refer to 
NOISE, VIBRATION & HARSHNESS - F150 PICKUP . 

Certain symptoms may be caused by Traction-Lokohm differentials (4026). Check the vehicle certification label 
and axle identification tag to determine the type of differential. 

Noise Acceptability 

 

2003 Ford Pickup F150 

2003 GENERAL INFORMATION Driveline System - General Information - F150 Pickup