4T60E Tcc Solenoid 1991, new and ready to install. Fits the 4T60E. Ships fast from the USA.
Owners of early-1990s GM front-drive cars, such as a 1991 Buick LeSabre or Park Avenue, Oldsmobile 98, Pontiac Bonneville or Cadillac with the 4T60-E, usually find this page after the converter stops locking up at highway speed, the engine sits higher in RPM than it used to at cruise, or a lockup code shows up. This is the electrical answer for that era: a three-piece set of new ACDelco solenoids, each in its own ACDelco box. You get the TCC (lockup) on/off solenoid plus the two on/off shift solenoids. The listing gives ACDelco part number 24202614 and interchange numbers including 84421, D84421 and 84825, and it is sold as covering the 4T60-E from 1991 on.
The 4T60-E was the first version of GM's 4T60 front-drive transaxle with computer-controlled shifts. On the on/off design this set serves, lockup is a simple decision: when the computer sees a warm engine, a steady road speed and light throttle, it energizes the TCC solenoid, which closes an exhaust port so oil can stroke the TCC apply valve and lock the converter clutch. De-energize it and the oil exhausts, and the converter unlocks. There is no ramp, so a weak coil or a leaking seat shows up as no lockup at all, or lockup that comes and goes. The two shift solenoids work the same way, switching on and off in pairs to choose first through fourth, which is why the same age-related failures that hit the TCC solenoid also cause missing gears. Some 4T60-E units also carry a PWM solenoid to soften lockup apply; a transaxle that has one needs the matching four-piece set instead.
On a 1991 car, the computer usually reports two-digit flash codes rather than modern P-codes, so pull the codes with the correct method for your vehicle. Check the fluid level and smell; burnt fluid means the converter clutch may be worn. Then measure the coil resistance of each solenoid at the case connector against the service manual value and check the internal harness for chafing. Remember that a worn TCC apply valve bore causes the same lockup complaints, as Sonnax shows in its 4T60-E valve body layout. Our solenoid symptom guide and the engagement troubleshooting guide cover the basic tests that apply to this transaxle family.
This set is listed for the 1991-on 4T60-E with on/off lockup control. Because some 4T60-E units also use a PWM lockup solenoid, compare your old solenoids and their connectors with the photo, or send us your year and VIN so we can confirm. If your unit does use the PWM solenoid, the four-piece 4T60E TCC solenoid kit includes it, and the single GM TCC PWM solenoid is available on its own. Browse the rest of the family on the 4T65E and 4T60E parts page.
If the transmission has high mileage and also slips, rebuild it at the same time with the 1991-94 4T60E overhaul kit.
| Fits | 4T60E 1991 |
| Part type | Tcc Solenoid |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Three new ACDelco solenoids, each boxed: the TCC (lockup) on/off solenoid and two on/off shift solenoids. The listing part number is ACDelco 24202614.
This set covers on/off lockup control. Some 4T60-E units also use a PWM solenoid. Compare your old parts and connectors with the photo, or send us your year and VIN to confirm.
Cars of this age typically flash two-digit codes through the diagnostic connector. Sonnax lists code 39 for 4T60-E lockup problems. Use the code-reading method for your specific vehicle.
Dexron VI. GM designed it to be back-compatible with the earlier Dexron specifications used when this transaxle was new.
Usually yes. They are the same age, they share the same harness, and the side cover is already off, so replacing all three avoids a second teardown when a shift solenoid fails later.
