Shift Solenoid - Single

This procedure covers the removal and replacement of a single shift solenoid in the 48RE automatic transmission on a 2007 Ram 3500 with the 5.9L Cummins diesel engine.

Warnings

Tools required

Parts

• Transmission shift solenoid (specify which: OD, UD, 2-4, or L-R based on diagnostic code) × 1 — Use OEM Mopar specification or quality aftermarket
• Transmission oil pan gasket × 1 — Use OEM specification
• Valve body cover gasket × 1 — Use OEM specification
• Transmission filter (recommended) × 1 — Use OEM specification

Fluids

• ATF+4 — 6 qt

Preparation

1. Park vehicle on level surface and apply parking brake
2. Place wheel chocks behind rear wheels
3. Allow transmission to cool completely if recently driven (minimum 2 hours)
4. Raise front of vehicle with floor jack and support securely on jack stands at frame rails
5. Position drain pan under transmission oil pan

Procedure

1. 1

   Remove transmission oil pan bolts
   Using a 13mm socket, begin loosening all transmission oil pan bolts in a crisscross pattern. Loosen bolts gradually but do not remove completely yet. This allows fluid to drain slowly and in a controlled manner. Once fluid begins draining, carefully remove bolts starting from one corner, leaving two bolts on opposite side partially threaded to control pan removal.
2. 2

   Remove transmission pan and filter
   Carefully lower the transmission pan, being mindful that several quarts of ATF+4 will drain out. Clean the pan thoroughly and inspect for metal debris or clutch material (excessive amounts indicate larger transmission problems). Remove the transmission filter by pulling straight down - it is held by an o-ring seal. Inspect filter for debris.
3. 3

   Remove valve body cover
   Locate the valve body cover plate on the bottom of the valve body assembly. Remove the T30 Torx bolts securing the valve body cover in the specific pattern (typically 8-10 bolts). Keep bolts organized as some may be different lengths. Carefully remove the cover plate and gasket, taking care not to drop any bolts into the transmission.
4. 4

   Identify and access the solenoid
   With the valve body cover removed, identify the specific solenoid to be replaced based on your diagnostic codes. The solenoids are mounted to the valve body. The Overdrive solenoid is typically located toward the rear driver side, Underdrive toward front driver side, 2-4 clutch center rear, and L-R clutch center front. Note the exact position and orientation before removal.
5. 5

   Disconnect solenoid electrical connector
   Carefully disconnect the electrical connector from the solenoid being replaced. The connector has a locking tab that must be released. Use gentle pressure and do not force. Note the routing of the wiring harness for reassembly.
6. 6

   Remove the solenoid
   Remove the bolts or retaining clips securing the solenoid to the valve body (typically two small bolts per solenoid). Carefully pull the solenoid straight out from the valve body. The solenoid has an o-ring seal that may stick. Use a gentle twisting motion if needed. Do not pry against the valve body as aluminum is soft and easily damaged.
7. 7

   Install new solenoid
   Ensure the new solenoid has a lubricated o-ring (use clean ATF+4). Carefully insert the new solenoid straight into the valve body bore, ensuring proper alignment. Do not cross-thread or force. Install retaining bolts or clips and tighten securely but do not overtighten (typically 35-50 in-lbs, but since no torque spec is provided, tighten firmly by hand feel). Reconnect electrical connector until it clicks into place.
8. 8

   Reinstall valve body cover
   Install a new valve body cover gasket (do not reuse old gasket). Position the cover plate carefully, ensuring proper alignment. Install all T30 Torx bolts and tighten in a crisscross pattern to ensure even gasket compression. Tighten securely but avoid overtightening the soft aluminum valve body.
9. 9

   Install new transmission filter
   Install the new transmission filter by pushing straight up into the bore until the o-ring seats completely. The filter should be firmly seated and not loose.
10. 10

    Reinstall transmission pan
    Clean the transmission pan mating surface on the transmission case thoroughly, removing all old gasket material. Install new transmission pan gasket (ensure correct orientation). Position pan and install all bolts hand-tight first. Then tighten bolts in a crisscross pattern to ensure even gasket compression. Typical torque is approximately 150 in-lbs (12 ft-lbs); verify against factory specification and tighten firmly and evenly to avoid leaks.
11. 11

    Refill transmission fluid
    Lower vehicle to ground. Remove transmission dipstick. Using a long-neck funnel, add approximately 5-6 quarts of ATF+4 through the dipstick tube. Start with 5 quarts, then check level. The transmission holds approximately 14-15 quarts total (including torque converter), but you are only replacing what drained from the pan.
12. 12

    Check and adjust fluid level
    Start the engine and allow to idle in Park. Shift through all gear ranges pausing 3 seconds in each position, then return to Park. With engine running and transmission at operating temperature (typically 160-200°F), check fluid level on dipstick. Fluid should be in the HOT range. Add fluid as needed in small increments to reach proper level. Do not overfill.

Reassembly

1. Ensure all valve body cover bolts are tightened in proper sequence
2. Verify transmission pan bolts are evenly tightened to prevent leaks
3. Double-check that the solenoid electrical connector is fully seated and locked

Verification

• Start engine and verify no transmission fluid leaks from pan or valve body cover area
• With engine at idle in Park, check transmission fluid level and ensure it is in proper range on dipstick
• Road test vehicle through all gear ranges to verify proper shift operation and that diagnostic trouble codes do not return
• After road test, recheck fluid level with transmission at operating temperature and top off if needed
• Clear any stored diagnostic trouble codes and verify the solenoid replacement has resolved the issue

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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