Transmission Kickdown Cable Adjustment

This procedure covers the adjustment of the transmission kickdown cable (also called throttle valve cable) on the 47RE/48RE automatic transmission to ensure proper transmission shift points and line pressure.

Warnings

Tools required

Parts

• Transmission kickdown cable × 1 — Use OEM specification if cable is damaged

Preparation

1. Warm engine to full operating temperature (minimum 10 minutes of driving or idling)
2. Park vehicle on level ground and set parking brake
3. Allow engine to idle and ensure transmission is in Park
4. Open hood and secure with prop rod
5. Locate the kickdown cable at the injection pump throttle lever (driver side of engine)

Procedure

1. 1

   Locate kickdown cable assembly
   Identify the kickdown cable running from the transmission to the injection pump throttle lever on the driver side of the engine. The cable attaches to a ball stud on the throttle lever arm and has an adjustment mechanism near the cable housing bracket.
2. 2

   Inspect cable condition
   Check the cable housing for cracks, kinks, or damage. Inspect the cable end fittings for wear or corrosion. Verify the cable moves freely without binding. If cable is damaged or binds, replacement is required before adjustment.
3. 3

   Release cable adjuster lock
   Locate the adjuster mechanism on the cable housing near the bracket. Lift or release the spring-loaded locking tab (design varies by year) to unlock the sliding adjuster so the cable housing can move within the bracket. Some models require inserting a small screwdriver to depress the locking tab.
4. 4

   Move throttle to idle position
   With engine idling, ensure the injection pump throttle lever is fully returned to the idle stop position. The cable should have minimal slack but should not pull the lever away from the idle stop.
5. 5

   Set cable to zero pressure position
   With the injection pump throttle lever held firmly against its full-throttle stop, pull the cable slider through the adjuster housing to remove all slack from the cable inner wire until taut but not stretched. Hold this position for the next step.
6. 6

   Lock adjuster in position
   While maintaining gentle tension on the cable housing, press the adjuster lock mechanism back into its locked position. You should hear or feel it click into place. Release the cable housing - it should remain in this adjusted position.
7. 7

   Verify full throttle travel
   Have an assistant press the accelerator pedal to the floor while you observe the throttle lever. The lever should travel to its full throttle stop position without the cable limiting its movement. The cable should reach full extension just as the lever hits the stop.
8. 8

   Check idle return
   Have the assistant release the accelerator pedal. Verify the throttle lever returns fully to the idle stop without the cable preventing full return. There should be a small amount of freeplay at idle so the cable does not pull the lever off the idle stop (verify exact spec against the factory service manual).
9. 9

   Test adjustment under load
   With vehicle still in Park, briefly increase engine RPM to 1500-2000 RPM and release. Observe smooth cable operation and complete return to idle. If cable binds or does not return properly, inspect routing and repeat adjustment.

Reassembly

1. No disassembly required for this procedure

Verification

• Road test vehicle through all gears, noting smooth shift points between 1st-2nd at approximately 15 mph, 2nd-3rd at approximately 25 mph, and 3rd-4th (overdrive) at approximately 45 mph under light throttle
• Verify transmission downshifts properly when accelerator is pressed beyond 3/4 throttle at highway speeds
• Confirm no harsh or delayed shifts occur during normal driving
• Check that transmission engages smoothly into Drive and Reverse from Park
• If shifts are too early or soft, cable may be too loose - readjust with slightly more tension
• If shifts are harsh or too late, cable may be too tight - readjust with slightly less tension

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