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Road Test

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  1. Check fluid level and correct if necessary. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. Use initial road test to verify transmission malfunction. Ensure engine is operating properly.
  2. Ensure engine and transmission are at normal operating temperature. Place gearshift lever in "D" position. Check minimum throttle upshifts in overdrive. Transmission should start in 1st gear and shift automatically into and through each gear at pre-determined specifications. See Figure-Figure .
  3. With transmission in 4th gear (overdrive), depress overdrive cancel switch. Transmission should downshift to 3rd gear.
  4. Depress accelerator pedal to floor (WOT). Transmission should downshift from 3rd to 2nd or 1st gear, depending on vehicle speed. See Figure-Figure .
  5. When traveling above 50 MPH at less than half throttle, move gearshift lever from Overdrive to 2nd gear and release accelerator pedal. Transmission should immediately downshift into 2nd gear. With gearshift lever and transmission in 2nd gear, move gearshift lever to 1st gear and release accelerator pedal. Transmission should downshift to 1st gear at less than 30-35 MPH. If transmission does not shift as specified, see appropriate symptom in appropriate SYMPTOM DIAGNOSIS under TROUBLE SHOOTING .
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