4L70E Solenoid Kit 1993-2005, new and ready to install. Fits the 4L70E. Ships fast from the USA.
A 1990s or early-2000s GM truck, van or SUV that will not leave third gear, starts out in second, or sets a shift solenoid code is a common sight, and on a transmission this old the harness is usually as tired as the solenoids. This new solenoid kit is listed for 1993-2005 units in the GM 4L60E family, the case the 4L70E was later built from. According to the product photo it is a full service package rather than a bag of loose parts: the 1-2 and 2-3 shift solenoids, the pressure control (EPC) solenoid, the converter clutch and 3-2 control solenoids, the pressure switch manifold, an internal wiring harness, retaining clips, a filter and a cork pan gasket. One pan drop handles the whole electrical side of the valve body.
Strictly speaking, GM did not use the 4L70E name until the 2006 model year, when ATRA's GM update material announced it as a new model built on the same technology as the revised 4L60E and 4L65E. For 1993-2005 you are working on the electronic 4L60E (and late in the range, the 4L65E), which is why this kit is filed under the whole family. The computer selects gears with two on/off solenoids. ATRA's solenoid chart lists first gear as A on and B on, second as A off and B on, third as both off, and fourth as A on and B off. The pressure switch manifold reports the manual valve position back to the computer, and the EPC solenoid sets line pressure. Early units ran only an on/off converter clutch solenoid; GM later added a PWM apply solenoid so lockup could be ramped in smoothly, so the parts you remove will depend on your exact year.
With the case connector unplugged, ATRA's resistance bulletin lists the 1-2 solenoid at pins E and A and the 2-3 solenoid at pins E and B, each at 20 to 40 ohms. If several codes set together, check the shared power feed before blaming every solenoid; ATRA bulletin 583 traces no-shift and stuck-in-third complaints with multiple codes to a poor crimp on circuit 1020. Our 4L70E common problems guide covers the family's mechanical failures, such as a burned 3-4 clutch, that can also take gears away.
Listed for 1993-2005, which covers Silverado and Sierra, Tahoe, Yukon, Suburban, S10, Blazer, Astro, Safari and similar applications of the period. The big variable inside this range is the EPC solenoid. Sonnax notes the early 1992-2002 EPC design differs from the 2003-and-later version, and the pin and connector layouts keep them from swapping without an adapter. Harness connectors and the converter clutch solenoids also changed over these years. Match the EPC connector, the harness plugs and the TCC parts in the photo against your transmission, or send your year and VIN before ordering. If your unit is 2006 or newer, the 4L60E, 4L65E and 4L70E interchange guide explains what changed, and the rest of the lineup is on the 4L70E collection page.
Drain the fluid and remove the pan and old filter. Take a photo of the harness routing, then unplug and remove each solenoid and the pressure switch manifold, keeping track of the clips. Look in the pan and on the old filter for clutch material or metal; heavy debris means the transmission needs more than solenoids. Lube each O-ring with ATF before installing so it seats without rolling, torque the manifold bolts evenly, and route the new harness clear of the valve body linkage. Install the supplied filter and pan gasket, refill with DEXRON-VI (the current GM fluid for this family), clear codes and road test. If the valve body itself is worn, the 2003 4L70E valve body suits late units in this range, and the 1992-2003 Banner rebuild kit covers a full overhaul.
| Fits | 4L70E 1993-2005 |
| Part type | Solenoid Kit |
| 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.
GM introduced the 4L70E name for 2006. Before that the same case family was the 4L60E. This kit is listed for 1993-2005 units of that family, so the year range is what matters, not the name.
The product photo shows shift solenoids A and B, the EPC solenoid, converter clutch and 3-2 solenoids, a pressure switch manifold, internal harness, clips, filter and pan gasket. Compare it against your own parts before installing.
Not automatically. Sonnax notes the 1992-2002 EPC and the 2003-later EPC use different pin and connector layouts. Check your connector or send your year and VIN.
ATRA lists solenoid A at case connector pins E and A and solenoid B at pins E and B, each 20 to 40 ohms. A reading outside that range points to the solenoid or harness.
Use DEXRON-VI, which GM now specifies for this transmission family and which is backward compatible with earlier Dexron fills. Install the supplied filter and gasket at the same time.
