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Steve
Steve, Auto Service Technician
Category: Car
Satisfied Customers: 5494
Experience:  25+ yrs experience as a professional working technician; ASE L1 master technician
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2001 Dodge Ram 2500: 4wd..transmission seems to be hunting overdrive

Customer Question

I got a 2001 Dodge Ram 2500 4wd. The transmission seems to be hunting overdrive at 45 to 50 mph. Any suggestions?

Optional Information:
2001 Dodge ram 2500 5.9 diesel

Already Tried:
Checked wiring connections battery, at trans. and pcm.





Submitted: 11 years ago.
Category: Car
Expert:  Steve replied 11 years ago.

Greetings!


You may want to check with your local Dodge dealer; I believe there is a PCM software upgrade to address this concern. The PCM can only be reflashed by a DRB-III scan tool with programming software; any Dodge dealer and some independent repair shops can do this for you.


One other possibility is a misadjusted throttle valve cable. Here is the procedure for verifying TV adjustment:


A correctly adjusted throttle valve cable will cause the throttle lever on the transmission to move simultaneously with the throttle body lever from the idle position. Proper adjustment will allow simultaneous movement without causing the transmission throttle lever to either move ahead of, or lag behind the lever on the throttle body.

ADJUSTMENT VERIFICATION



  1. Turn ignition key to OFF position.
  2. Remove air cleaner
  3. Verify that lever on throttle body is at curb idle position (Fig. 231). Then verify that the transmission throttle lever (Fig. 232) is also at idle (fully forward) position.
  4. Slide cable off attachment stud on throttle body lever.
  5. Compare position of cable end to attachment stud on throttle body lever

    • Cable end and attachment stud should be aligned (or centered on one another) to within 1 (0.039 inch) in either direction (Fig. 233).
    • If cable end and attachment stud are misaligned (off center), cable will have to be adjusted as described in TV Cable Adjustment procedure.


    1. Reconnect cable end to attachment stud. Then with aid of a helper, observe movement of transmission throttle lever and lever on throttle body.



      • If both levers move simultaneously from idle to half-throttle and back to idle position, adjustment is correct.
      • If transmission throttle lever moves ahead of, or lags behind throttle body lever, cable adjustment will be necessary. Or, if throttle body lever prevents transmission lever from returning to closed position, cable adjustment will be necessary.


  6. ADJUSTMENT PROCEDURE



    1. Turn ignition switch to OFF position.
    2. Remove air cleaner if necessary.
    3. Disconnect cable end from attachment stud. Carefully slide cable off stud. Do not pry or pull cable off.
    4. Verify that transmission throttle lever is in fully closed position. Then be sure lever on throttle body is at curb idle position.
    5. Pry the T. V cable lock (A) into the UP position (Fig. 233). This will unlock the cable and allow for readjustment.
    6. Apply just enough tension on the T. V cable (B) to remove any slack in the cable. Pulling too tight will cause the T. V. lever on the transmission to move out of its idle position, which will result in an incorrect T. V. cable adjustment. Slide the sheath of the T. V cable (D) back and forth until the centerlines of the T. V. cable end (B) and the throttle bell crank lever (C) are aligned within one millimeter (1mm) (Fig. 233).
    7. While holding the TX cable in the set position push the T. V. cable lock (A) into the down position (Fig. 233). This will lock the present T. V. cable adjustment. NOTE: Be sure that as the cable is pulled forward and centered on the throttle lever stud, the cable housing moves smoothly with the cable. Due to the angle at which the cable housing enters the spring housing, the cable housing may bind slightly and create an incorrect adjustment.
    8. Reconnect the T. V. cable (B) to the throttle bellcrank lever (C).
    9. Check cable adjustment. Verify transmission throttle lever and lever on throttle body move simultaneously.




I hope this is helpful; if so, an accept would be most appreciated! thanks!