Torque Converter Clutch Solenoid

This procedure involves removing the transmission pan, replacing the torque converter clutch (TCC) solenoid in the valve body, and refilling the transmission with ATF+4.

Warnings

Tools required

Parts

• Torque converter clutch solenoid (TCC solenoid) × 1 — Use OEM Mopar specification for 48RE transmission
• Transmission pan gasket × 1 — 48RE transmission pan gasket
• Transmission filter × 1 — 48RE transmission filter (recommended while pan is off)
• Pan bolts (if corroded) × 1 — Use OEM specification

Fluids

• ATF+4 — 10 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow transmission to cool completely if vehicle was recently operated
3. Raise vehicle using floor jack and support securely on jack stands at frame rails
4. Position large drain pan under transmission pan
5. Verify you have sufficient ATF+4 transmission fluid (approximately 8-10 quarts will be needed)
6. Disconnect negative battery cable to prevent electrical issues during solenoid replacement

Procedure

1. 1

   Drain transmission fluid
   Locate the transmission pan on the bottom of the 48RE transmission. Check whether the pan has a drain plug; if equipped, remove the drain plug to drain fluid before removing pan bolts. Beginning at one rear corner, loosen (but do not remove) all pan bolts approximately 3-4 turns. Gradually loosen the bolts on one side more than the other to allow the pan to tilt and drain fluid into the drain pan. Once fluid flow slows significantly, remove all remaining bolts except for two at opposite corners to support the pan.
2. 2

   Remove transmission pan
   Support the transmission pan with one hand and remove the final two bolts. Carefully lower the pan, being aware that residual fluid will spill. Set pan aside and allow remaining fluid to drain from transmission. Inspect pan for metal debris or excessive clutch material, which may indicate internal transmission damage.
3. 3

   Remove transmission filter
   Locate the transmission filter attached to the valve body. Remove the filter mounting screw(s) and carefully pull the filter straight down to remove it. Verify the exact number and location of screws against the OEM 48RE service diagram before removal. The filter neck has a seal (O-ring or press-in grommet depending on filter design) that may stick; confirm the correct seal type against the OEM 48RE filter kit. Set old filter aside for disposal.
4. 4

   Access valve body
   With the filter removed, you now have access to the valve body solenoid pack. The 48RE uses discrete solenoids on the valve body (including the governor pressure solenoid and the torque converter lockup/TCC solenoid) rather than a single multi-solenoid pack. Identify the TCC/lockup solenoid by tracing its wiring harness and consulting the OEM 48RE valve body diagram before removal. Note the orientation and position of the solenoid before removal.
5. 5

   Disconnect TCC solenoid electrical connector
   Locate the electrical feed for the TCC/lockup solenoid. Depending on valve body configuration this may be a spade terminal, pigtail, or connector routed to the case pass-through. Carefully disconnect it per the OEM 48RE wiring diagram, without pulling on the wires. Do not pull on the wires themselves.
6. 6

   Remove TCC solenoid retaining hardware
   The TCC solenoid is held in place by either Torx bolts or small hex bolts depending on the specific valve body configuration. Remove the solenoid retaining bolts (typically 2-3 bolts). Keep track of bolt locations as they may be different lengths.
7. 7

   Remove old TCC solenoid
   Carefully pull the TCC solenoid straight out from the valve body. The solenoid has O-rings that may cause resistance. Use a gentle twisting motion if needed, but do not pry against the valve body. Inspect the old solenoid for damage or contamination.
8. 8

   Install new TCC solenoid
   Inspect the new TCC solenoid O-rings for damage and lightly lubricate them with clean ATF+4. Align the solenoid with the valve body bore and carefully push it into place, ensuring it seats fully. The solenoid should sit flush with the valve body mounting surface.
9. 9

   Secure TCC solenoid
   Install the solenoid retaining bolts and tighten in a cross pattern to ensure even seating. Tighten bolts snug but do not over-torque as the valve body is aluminum and can be damaged. Reconnect the electrical connector to the new solenoid until it clicks into place.
10. 10

    Install new transmission filter
    Install the new transmission filter with a new O-ring on the neck if provided. Align the filter with the valve body and install the three mounting bolts. Tighten bolts evenly in a cross pattern to ensure proper seal.
11. 11

    Clean pan and transmission mating surfaces
    Using a plastic scraper or wire brush, thoroughly clean all old gasket material from both the transmission pan and the transmission case mating surface. Ensure surfaces are completely clean and dry. Inspect the pan for cracks or warping. Clean the magnet in the pan to remove any metal particles.
12. 12

    Install new pan gasket and reinstall pan
    Position the new transmission pan gasket on the pan or transmission case per gasket manufacturer instructions. Some gaskets have adhesive backing. Carefully lift the pan into position, aligning bolt holes. Install all pan bolts finger-tight first, then tighten in a cross pattern working from center outward. Final tightening should be gradual and even to avoid warping the pan or crushing the gasket.
13. 13

    Refill transmission with ATF+4
    Lower vehicle to the ground. Locate the transmission dipstick tube. Using a long funnel or fluid pump, add approximately 5-6 quarts of ATF+4 initially for a pan-drop service, then check level and add as needed. Verify capacity against OEM 48RE specifications. Start the engine and allow it to idle. With your foot on the brake, shift through all gear ranges, pausing 2-3 seconds in each position. Return to Park. Check fluid level on dipstick with engine running and transmission at normal operating temperature. Add fluid as needed to bring level to the full hot mark.
14. 14

    Check for leaks and test operation
    With engine running and transmission at operating temperature, raise vehicle and inspect the pan gasket area for any signs of leakage. Lower vehicle and perform a brief test drive, monitoring transmission shift quality and verifying that the torque converter locks up properly at highway speeds (typically 45+ mph in overdrive). The TCC should engage smoothly without shuddering.

Reassembly

1. Ensure all electrical connectors are securely attached and routing does not interfere with moving parts
2. Verify transmission pan bolts are tightened evenly in a cross pattern to prevent leaks
3. Double-check transmission fluid level after reaching normal operating temperature
4. Reconnect negative battery cable after all work is complete

Verification

• Check for fluid leaks around transmission pan with engine running and transmission warm
• Verify transmission shifts smoothly through all gears
• Confirm torque converter lockup engages at highway speeds without shuddering or slipping
• Monitor transmission fluid level after test drive and top off if necessary
• Use a scan tool to verify no transmission fault codes are present and TCC solenoid is commanding properly
• Recheck fluid level after 50-100 miles of driving and adjust as needed

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