Ford F150 Pickup. Instruction - part 1835

Fig. 18: Removing & Installing Extension Housing 
Courtesy of FORD MOTOR CO. 

Installation 

1. Clean mating surface on transmission and extension housing. Verify that the extension has a shoulder cast 

in it. See Fig. 19 . Install NEW extension housing gasket and position extension housing on case.  

2. Install the extension housing bolts. See Fig. 18 . Ensure parking pawl spring is properly seated in case. 

Connect the output shaft speed (OSS) sensor. 

3. Raise the transmission up. Install the rear transmission mount. Install the bolts and tighten to 

specification. See TORQUE SPECIFICATIONS . Lower the transmission on to the rear crossmember 

CAUTION: The extension housing for the 4R100 has a shoulder or a boss cast in it to 

hold the orifice lube plug in the back of the case. If the wrong extension 
housing is used, the plug may become loose and/or fall out and cause 
transmission damage.

CAUTION: Be sure not to raise the back of the transmission too high. If it makes 

contact with the underbody, damage to the TSS and OSS sensors will 
occur.

 

2003 Ford Pickup F150 

2003 AUTOMATIC TRANSMISSIONS Servicing - Blackwood, Econoline, Excursion, Expedition, "F" Series Pickup & 

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support. Install the transmission insulator and nuts. 

4. Tighten transmission insulator nuts to specification. See TORQUE SPECIFICATIONS . Remove the 

transmission jack from the transmission. Install the driveshaft. See appropriate DRIVESHAFTS & 
UNIVERSAL JOINTS article in DRIVELINE/AXLES. Lower the vehicle.  

5. Fill the transaxle with appropriate fluid to proper level and check for correct transaxle operation. See 

LUBRICATION .  

Fig. 19: Identifying Extension Housing Shoulder Boss (4R100) 
Courtesy of FORD MOTOR CO. 

EXTENSION HOUSING SEAL (4R70W) 

Removal 

1. Drain the transmission fluid. See DRAINING & REFILLING under LUBRICATION. Mark the 

driveshaft flange and the rear companion flange for correct alignment during assembly. See Fig. 16 .  

2. Remove the 4 driveshaft bolts. Separate the driveshaft from the transmission. Use a high-lift transmission 

jack to support the transmission. Remove the 2 transmission mount nuts. See Fig. 20 .  

3. Remove the transmission crossmember bolts. See Fig. 21 . Remove the transmission crossmember.  

4. Lower the transmission to access the extension housing seal. Using the Slide Hammer (100-001) and Seal 

Remover (307-048), remove the extension housing seal. See Fig. 22 . 

 

2003 Ford Pickup F150 

2003 AUTOMATIC TRANSMISSIONS Servicing - Blackwood, Econoline, Excursion, Expedition, "F" Series Pickup & 

Navigator

  

Fig. 20: Identifying Transmission Mount Nuts 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 AUTOMATIC TRANSMISSIONS Servicing - Blackwood, Econoline, Excursion, Expedition, "F" Series Pickup & 

Navigator

  

Fig. 21: Identifying Transmission Crossmember Bolts 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 AUTOMATIC TRANSMISSIONS Servicing - Blackwood, Econoline, Excursion, Expedition, "F" Series Pickup & 

Navigator