Shift Solenoid - Single

Replace a single shift solenoid in the transmission by dropping the transmission pan, accessing the valve body, and replacing the faulty solenoid.

Warnings

Tools required

Parts

• Shift solenoid (transmission-specific) × 1 — Use OEM specification - varies by solenoid position
• Transmission pan gasket × 1 — Use OEM specification
• Transmission filter × 1 — Use OEM specification
• Pan bolts (if reuse not recommended) × 1 — Use OEM specification

Fluids

• Mopar ATF+4 — 5 qt

Preparation

1. Verify vehicle has automatic transmission (not standard T56 manual)
2. Park vehicle on level surface and set parking brake
3. Allow transmission to cool for at least 2 hours if recently driven
4. Raise vehicle using floor jack and support securely on jack stands rated for vehicle weight
5. Locate transmission pan - positioned at bottom center of transmission bellhousing
6. Position drain pan beneath transmission pan

Procedure

1. 1

   Drain transmission fluid
   Loosen all transmission pan bolts approximately 3-4 turns but do not remove. Starting at one corner, carefully loosen bolts further on that corner to allow fluid to drain into pan. Control the flow by keeping opposite side bolts slightly tighter. Once fluid slows to drip, remove all pan bolts completely. Lower pan carefully and pour remaining fluid into drain pan.
2. 2

   Remove transmission pan and filter
   Remove transmission pan completely and set aside. Inspect pan interior for metal shavings or debris - excessive debris indicates broader transmission issues. Remove transmission filter by pulling straight down - it is typically held by friction fit or may have 3 bolts securing it. Discard old filter.
3. 3

   Access valve body
   With pan removed, locate the valve body - the aluminum component with multiple solenoids mounted to it. Identify which solenoid requires replacement by cross-referencing diagnostic trouble code with solenoid positions. Common solenoids include shift solenoid A, shift solenoid B, line pressure solenoid, and torque converter clutch solenoid. Take a photo of wiring harness routing before disconnection.
4. 4

   Disconnect solenoid electrical connector
   Locate the wiring harness connector for the target solenoid. Press the release tab and carefully pull connector straight off solenoid terminals. Do not pull on wires themselves. Inspect connector pins for corrosion or damage.
5. 5

   Remove faulty shift solenoid
   Remove the solenoid mounting bolt or bolts securing the solenoid to the valve body. Typical configuration uses 1-2 bolts per solenoid. Carefully pull solenoid straight out from valve body. Some resistance is normal due to O-ring seal. Inspect solenoid bore in valve body for debris or scoring.
   ⚠Do not allow debris to fall into valve body passages during solenoid removal. Cover adjacent openings with clean shop rags if necessary.
6. 6

   Install new shift solenoid
   Verify new solenoid matches old unit exactly in connector orientation and mounting hole pattern. Not applicable - this vehicle's manual transmission has no valve body solenoids. Insert solenoid straight into valve body bore, seating fully. Install mounting bolt(s) and tighten evenly to secure solenoid without over-torquing the aluminum valve body threads. Reconnect electrical connector until it clicks into place.
7. 7

   Install new transmission filter
   Position new transmission filter into place. If filter uses mounting bolts, install and tighten them evenly. If friction-fit style, press firmly upward until fully seated against valve body.
8. 8

   Clean and prepare pan mating surfaces
   Use plastic gasket scraper to remove all old gasket material from transmission pan mating surface and transmission case flange. Do not use metal scrapers that could gouge sealing surfaces. Clean surfaces with brake cleaner or ATF+4 and wipe dry. Inspect pan for dents or warping around bolt holes.
9. 9

   Install new gasket and transmission pan
   Position new transmission pan gasket on pan or transmission case per gasket manufacturer instructions (some use adhesive, some are dry-fit). Align transmission pan to case and start all pan bolts by hand. Tighten pan bolts in crisscross pattern working from center outward to pull pan evenly against gasket. Final tighten in same pattern to achieve uniform clamping force.
10. 10

    Refill transmission
    Lower vehicle to ground. This step is not applicable. The Viper's manual transmission does not use a dipstick or ATF+4. If servicing the manual transmission, refill through the side fill plug with the OEM-specified manual transmission lubricant per the factory service manual. Start engine and allow to idle. With foot on brake, shift through all gear positions, pausing 2-3 seconds in each. Return to Park. Check fluid level on dipstick with engine running - fluid should be in 'Cold' range. Add fluid as needed to reach proper level. Recheck after test drive when transmission reaches operating temperature - level should be in 'Hot' range.

Reassembly

1. Transmission pan bolts should be tightened in crisscross pattern to prevent gasket distortion and leaks
2. Verify electrical connector for new solenoid is fully seated and locked
3. Final fluid level must be verified with transmission at operating temperature (after 10-15 minute drive)

Verification

• Start engine and verify no transmission fluid leaks from pan gasket
• Check that diagnostic trouble code that prompted solenoid replacement has cleared after driving through several shift cycles
• Perform test drive and verify smooth shifting through all gears with no harsh engagement or slipping
• Recheck transmission fluid level with transmission at operating temperature - adjust as needed to proper 'Hot' range on dipstick
• Scan transmission control module for any new or pending codes

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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