AODE Tcc Solenoid 1998-2008

If your F-150, Expedition, Crown Victoria, Grand Marquis or Town Car shudders at a light, steady throttle around 45 to 55 mph, never seems to settle into lockup on the highway, or has stored P0741 or P0743, the torque converter clutch solenoid is a cheap, pan-off part to rule out before anything bigger. This is a single new BorgWarner TCC solenoid assembly for the AODE family built from 1998 through 2008, which Ford sold as the 4R70W and later the 4R75W. It is the hardwire style used with the molded lead frame harness and black case connector, so it fits the units that came after Ford dropped the old wired harness. The industry interchange number on this solenoid is 76922.

What the TCC solenoid does in an AODE/4R70W

Gear selection in this transmission comes from two on/off shift solenoids, and line pressure comes from the EPC solenoid. The TCC solenoid sits on the valve body beside them and handles only lockup. When the PCM sees steady cruise, warm fluid and enough road speed, it switches the solenoid on. Signal oil then moves the bypass clutch control valve, which applies the clutch inside the converter and ties the engine to the input shaft. A solenoid that sticks, flows weakly or leaks past a hard O-ring gives the valve a soft or unsteady signal, and the converter clutch slips instead of clamping. That slip is the shudder, the extra cruise RPM and the heat.

Symptoms of a failing TCC solenoid

• Shudder like driving over rumble strips at 40 to 60 mph under light throttle
• No lockup: highway RPM stays a few hundred higher than normal and fuel mileage drops
• Lockup that applies and releases repeatedly on a level road
• P0741 (converter clutch slip) or P0743 (TCC electrical circuit)
• Engine stalling as you come to a stop if the clutch stays applied
• Fluid running hot, since an unlocked converter keeps generating heat at cruise

How to confirm it before you buy

Start with the fluid. Burnt, dark Mercon V causes shudder by itself, and a new solenoid will not cure that. Then measure the TCC circuit at the case connector. This solenoid is the 10 to 15 ohm type, and Sonnax lists 10 to 16 ohms as good for the TCC solenoid on 1998-2008 units. A reading far outside that range, or an open circuit, points at the solenoid or the lead frame. Remember that a P0743 covers the whole circuit, so check the connector and wiring before you condemn the part. Our 4R70W solenoid testing guide walks through the pin-out and the resistance checks, and the Crown Victoria common problems guide shows how lockup complaints show up on the Panther cars. If the solenoid tests good and the PCM commands full lockup but slip stays high, the converter clutch or a worn bypass clutch control valve bore is next on the list.

Fitment

This solenoid fits AODE, 4R70W and 4R75W transmissions from 1998 through 2008 that use the molded lead frame and the black case connector. ATRA notes that 1993-1997 units use a white connector with the wiring built in, and that solenoids do not interchange between the two designs. That means this part will not work in a 1997 or earlier plug-in style unit. ATSG also points out that 2009 units went back to a soft wire harness with new solenoids that do not retrofit to older models, so a 2009 needs the 2009 4R70W TCC solenoid. The connector color on the solenoid itself can vary. If you are unsure which harness you have, look at the case connector color or send us your year and VIN before you order. Everything we carry for this family is on the 4R70W/4R75W collection page.

Install notes

• The transmission stays in the vehicle. Drain the fluid, remove the pan and filter, and you can reach the solenoid on the valve body.
• Release the solenoid from the lead frame and remove its retaining bolt. Do not pry on the lead frame; it is brittle with age.
• Lube the new O-rings with clean Mercon V and push the solenoid straight into its bore so an O-ring does not roll.
• Torque the retainer to the service manual value, refit the filter and pan, and refill with Mercon V. Ford advises against additives.
• Clear codes and drive through several lockup cycles at steady cruise to confirm a firm apply.

If several solenoids are suspect, the 2005-2008 solenoid set replaces the TCC, EPC and shift solenoids in one pan drop. If the fluid is black and full of debris, flush or replace the transmission cooler so old material does not return to the new part.

Will this fit my 1996 F-150?

No. 1993-1997 units use a white case connector with soft wiring, and their solenoids do not interchange with the 1998-on lead frame design this part is made for.

Is this the whole solenoid pack or only the TCC solenoid?

It is one TCC lockup solenoid assembly. If you want the TCC, EPC and shift solenoids together, see our 2005-2008 solenoid set.

What resistance should a good TCC solenoid read?

This is the 10 to 15 ohm type, and Sonnax lists 10 to 16 ohms for 1998-2008 TCC solenoids. Check the lead frame and connector too, because a circuit code covers more than the solenoid.

Do I have to pull the transmission to install it?

No. It mounts on the valve body, so draining the fluid and dropping the pan gives you access.

What fluid should I refill with?

Mercon V ATF. Ford lists Mercon V for the 4R70W and 4R75W and recommends against supplemental additives.

My truck is a 2009. Does this fit?

No. 2009 units use a soft wire harness and new solenoids that do not retrofit, so order the 2009 TCC solenoid instead.

• 4R70W Shift Solenoid Symptoms, Testing and Replacement
• 4R70W Crown Victoria Common Problems and Fixes
• 4R70W Expedition Common Problems and Fixes
• 4R70W Pressure Control (EPC) Solenoid Symptoms