4L70E Tcc Solenoid 1993, new and ready to install. Fits the 4L70E. Ships fast from the USA.
A 1993 GM rear-drive truck, van or V8 car that will not lock the converter at highway speed, cruises a few hundred RPM higher than it used to, or shudders as it tries to lock up usually points to the converter clutch circuit. This listing is a single new ACDelco solenoid for 1993 transmissions in the family GM first called the 4L60E and later developed into the 4L70E. 1993 was the first production year of that design, and the early units are wired and plumbed differently from the later ones, so this page is mostly about making sure you buy the right piece for a 1993.
The torque converter clutch locks the engine to the transmission input once the vehicle is cruising, which removes converter slip, drops engine speed and cuts heat. The computer decides when to lock up and energizes the solenoid, which closes an exhaust and lets oil stroke the TCC apply valve. According to Sonnax, pulse-width-modulated lockup control did not arrive in this family until 1995, and the partial-apply EC3 strategy came in 1998. That means a 1993 unit uses simple on/off lockup: the clutch is either applied or released, with no metered slip. When the solenoid sticks open, leaks at its O-ring or loses its coil, the converter never locks.
Check the simple things first. The brake switch has to open the lockup circuit when you touch the pedal, so a misadjusted switch can kill lockup by itself. With the pan off, measure the solenoid coil resistance and apply 12 volts to hear it click. A solenoid that tests fine while the converter still will not lock points to the hydraulic side: a worn TCC apply valve, a leaking converter clutch, or a pump that cannot hold pressure. Our 4L70E common problems guide covers the converter and 3-4 clutch failures this family is known for, and the valve body testing guide explains the bore wear that imitates a dead solenoid.
The listing covers 1993. Sonnax notes that 1993 to 1995 valve bodies used a PWM-style 3-2 control solenoid, while the TCC solenoid in those years was the on/off type, and the two look nothing alike. Before ordering, compare the body, snout and connector in the photo with the solenoid in your pan. If they differ, or your vehicle is a 1994 or 1995, send us your year and VIN and we will confirm the correct part. A 1993 transmission will be tagged 4L60E, not 4L70E; the interchange guide explains how the names relate. Everything else we carry for this family is on the 4L70E collection page.
If the fluid is burnt and the front pump is noisy, a new solenoid will not fix it on its own; see our 4L70E pump before you close the pan.
| Fits | 4L70E 1993 |
| Part type | Tcc Solenoid |
| Condition | New |
| Brand | ACDelco |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for 1993 units. Because 1993 to 1995 transmissions mixed solenoid types, compare the photo with the solenoid in your pan or send us your year and VIN before ordering.
Yes. Every 1993 unit in this family was built as a 4L60E; the 4L70E name came much later for the heavier-duty version. Parts are listed under 4L70E so the whole family stays together.
No. Sonnax dates PWM lockup control to 1995 and EC3 partial apply to 1998, so a 1993 unit uses on/off lockup. The converter should lock firmly with a clear RPM drop.
GM supplies Dexron VI as the replacement for the earlier Dexron grades. Check the level hot after the road test.
Check the brake switch and the lockup circuit wiring, then the hydraulics. A worn TCC apply valve or a converter with a failed clutch will keep it from locking no matter how good the solenoid is.
