2000 F150 4wd overdrive shift problem

[fordtrucksonly]

My f150 4wd slips when the trans is shifting into overdrive,it will complete the shift if you let up on the gas. Any ideas

 

[blacksnapon]

My f150 4wd slips when the trans is shifting into overdrive,it will complete the shift if you let up on the gas. Any ideas

Shift Concerns: 3-4 Shift (Automatic) Possible Component Reference/Action
222 — ELECTRICAL ROUTINE
Powertrain Control System
· Electrical inputs/outputs, vehicle wiring harnesses, PCM, shift solenoids, OSS, transmission control switch (TCS)
· Carry out Self-Test. Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual for diagnosis and testing of the Powertrain Control System. Go To Pinpoint Test A or Go To Pinpoint Test E. Repair as required. Clear DTCs, road test and repeat Self-Test.

· Engine driveability concerns
· Refer to Routine 253.

322 — HYDRAULIC/MECHANICAL ROUTINE
Shift Linkage, Digital TR Sensor
· Damaged or incorrectly adjusted
· Inspect and repair as required. Verify transmission shift cable adjustment; refer to Section 307-05. Adjust transmission shift cable as necessary. After repairing transmission shift cable, verify that the digital TR sensor is correctly adjusted. Adjust the digital TR sensor as necessary.

Incorrect Pressures
· Forward clutch pressure, direct clutch pressure, line pressure
· Check line, direct and forward clutch pressures at appropriate taps; refer to Line Pressure Chart for specifications. If pressures are out of specification, check main controls.

Main Controls
· 3-4 shift valve, solenoid pressure regulator valve, OD servo regulator, 3-4 capacity modulator valve, 1-2 and 2-3 shift valves stuck, damaged or assembled incorrectly
· Inspect for damage. Repair as required.

· Bolts not tightened to specifications
· Tighten bolts to specifications.

· SSA or SSB malfunction
· Activate solenoid using scan tool. If solenoid operation cannot be felt when placing hand on solenoid, install a new solenoid. Inspect O-rings for damage. Repair as required.

· Gaskets damaged
· Inspect for damage and install a new gasket.

· OD servo rod and piston cushion spring or seals damaged
· Inspect for damage. Repair as required.

· Worn or damaged OD servo anchor pins
· Inspect for damage. Repair as required.

· No. 2, No. 4, No. 7 and No. 9 check balls damaged or missing
· Inspect for damage. Repair as required.

· Solenoid screen blocked or damaged
· Clean or install a new screen.

Pump
· Porosity/cross leaks, balls missing, damaged or leaking
· Inspect for porosity/leaks, balls missing. Install a new pump as required.

· Gaskets damaged
· Inspect for damage. Install new gaskets as required.

OD Band
· OD band and reverse clutch drum assembly damaged, worn or assembled incorrectly
· Inspect for damage. Repair as required.

· Intermediate one-way clutch assembly damaged
· Inspect for damage. Repair as required.

Forward Clutch Assembly
· Seals or piston damaged
· Inspect for damage. Repair as required.

· Friction elements worn or damaged
· Inspect for damage. Repair as required.

· Check ball stuck, damaged or not seating correctly
· Inspect for damage. Repair as required.

Input Shaft
· Seals damaged
· Inspect for damage. Repair as required.

 

[fordtrucksonly]

Thanks for your help.