8L90 Valve Body 2015-2024, remanufactured and ready to install. Fits the 8L90. Ships fast from the USA.
A worn 8L90 valve body is behind many of the harsh 1-2 and 2-3 shifts, flares, delayed engagements and burnt clutches reported on GM's 8-speed trucks, SUVs and performance cars. This remanufactured unit carries GM reference 24272846 and is listed for 2015-2024, so if your Silverado, Sierra, Tahoe, Yukon, Escalade, Camaro or Corvette has a confirmed hydraulic fault, it lets you replace worn bores and accumulator pistons in one step.
The 8L90 uses five friction elements and four planetary gear sets, and every shift is a clutch-to-clutch exchange timed by seven variable force solenoids (VFS): S1 through S6 for the clutches and line pressure, plus the TCC solenoid. The control solenoid valve body houses those solenoids along with the pressure regulator, clutch control valves and signal accumulator pistons that smooth each apply. Unlike some GM units, the TCM is a separate module, so the valve body is purely the hydraulic and solenoid side of the system. Sonnax notes normal peak line pressure on these units is roughly 315 psi; worn bores have been measured above 415 psi, high enough to open the OE blow-off spring.
First, rule out the cheapest fix. GM bulletin 18-NA-355 traces the common 25-80 mph rumble-strip shudder to the torque converter clutch and calls for a fluid exchange with Mobil 1 Synthetic LV ATF HP, not a valve body. If the shudder is gone but shift quality is still poor, test the VFS circuits for resistance and check commanded versus actual pressure with a gauge. Our 8L90 valve body symptoms guide pairs each complaint with the circuit behind it, and the 8L90 shift solenoid guide shows how to separate a bad solenoid from a worn bore.
This valve body carries GM reference 24272846 and is listed for 2015-2024 8L90 transmissions. GM moved many V8 trucks to its ten-speed automatic during that span, so confirm your vehicle actually has an 8L90 by the RPO code on the service parts label (M5U, M5X and related codes cover the 8L90) before ordering. The 8L45 is a separate, lighter-duty 8-speed with its own listings. Match the reference number on your original if it is readable, or send us your year and VIN. The full range is on our 8L90 parts collection.
| Fits | 8L90 2015-2024 |
| Part type | Valve Body |
| Condition | Remanufactured |
| Brand | GM |
| Reference | 24272846 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 8L90 appeared in 2015 in GM full-size trucks and SUVs, the Camaro and the Corvette, among others. Confirm your vehicle has the 8L90 by its RPO code, since many later V8 models switched to the ten-speed.
Usually not. The steady-speed shudder covered by GM bulletin 18-NA-355 comes from the torque converter clutch and is addressed with a fluid exchange to Mobil 1 Synthetic LV ATF HP. A valve body is for confirmed hydraulic faults such as harsh shifts, flares and pressure codes.
You can if they test within spec, but high-mileage solenoids are a common source of the same symptoms. Many installers replace the full set of seven at the same time.
Mobil 1 Synthetic LV ATF HP, which is licensed against DEXRON HP. GM lists the fluid change capacity at about 7.4 quarts.
The 8L90 pump is chain-driven and off-axis, and it can lose its prime after service. Follow the pump priming procedure, and note that a no-move right after a fast learn can need a 15-minute reset before it engages.
