Shift Point Road Test
The following Shift Point Road Test and Torque Converter Clutch Operation Test provide diagnostic information on transmission shift controls and torque converter operation.Shift Point Road Test
NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.
NOTE: If equipped, turn the power take-off unit off for proper test results. This test verifies that the shift control system is operating properly.
1. Bring engine and transmission up to normal operating temperature.
2. Operate the vehicle with the transmission range selector lever in (D) range.
3. Apply minimum throttle and observe the speeds at which the upshift occurs and the torque converter engages.
4. With the vehicle in OVERDRIVE (fourth gear), depress the transmission control switch. The transmission should downshift to third gear. Remove foot from accelerator pedal; engine braking should occur.
5. Press accelerator pedal to floor (wide-open throttle). Transmission should shift from third to second gear or third to first, depending on vehicle speed. Torque converter clutch should disengage and then reapply.
6. With vehicle (D) range above 80 km/h (50 mph) and less than half throttle, move the transmission range selector lever from (D) range to MANUAL 2 range and remove foot from accelerator pedal. The transmission should immediately downshift into second gear. With the vehicle remaining in MANUAL 2 range, move transmission range selector lever into MANUAL 1 range. Transmission should downshift into first gear at speeds BELOW 48 - 56 km/h (30 - 35 mph).
Applications Shift Speeds - Approximate* MPH (F-250, F-350 with 5.4L Over 8500 GVW Rating):
NOTE: D is the same as (D) with the transmission control switch actuated (light on).
*(1) Nominal shift speed at sea level is shown. Actual shift speed will depend on tire brand, size and axle ratio.
Applications Shift Speeds - Approximate* MPH (F-250, F-350, Series Super Duty with 6.8L):
NOTE: D is the same as (D) with the transmission control switch actuated (light on).
*(1) Nominal shift speed at sea level is shown. Actual shift speed will depend on tire brand, size and axle ratio.
Applications Shift Speeds - Approximate* MPH (F-250, F-350, Super Duty with 7.3L DITD):
NOTE: D is the same as (D) with the transmission control switch actuated (light on).
*(1) Nominal shift speed at sea level is shown. Actual shift speed will depend on tire brand, size and axle ratio.
7. If transmission fails to upshift/downshift or torque converter clutch does not apply and release, refer to Diagnosis by Symptom Index for concern diagnosis. Symptom Related Diagnostic Procedures