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Valve Body
(View Valve Body Layout Diagram)
Converter Feed Limit Valve Kit 154740-19K
O-Ringed End Plug Kit 154740-17K
O-Ringed Shuttle Valve Kit 154740-30K
Oversized Converter Feed Limit Valve Kit 154740-22K
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Helps cure:
- Excess converter pressure
- High TCC slip RPM
- Code P0218
- Code P0741
- Overheated converter
- Inadequate lubrication
-
Tooling:
- F-154740-TL22
- VB-FIX
Oversized S4 Clutch Control Valve Kit 154740-26K
Fits '19-later units only.
-
Helps cure:
- Burnt clutches
- Pressure loss
- Poor shift quality
-
Tooling:
- F-154740-TL26
- VB-FIX
Oversized Signal Accumulator Piston Kit 154740-01K
-
Helps cure:
- Poor shift quality
- Low line pressure
- No converter apply
- Hydraulic-related converter codes
- Burnt clutches
- Soft shifts
-
Tooling:
- 154740-TL
Pressure Regulator & Shuttle Valve Kit 154740-02K
Pressure Relief Ball Valve Spring 154740-18
-
Helps cure:
- No movement
- Damaged valve body casting
- Broken parts due to excessive line pressure
- Erratic line pressure
S1/S5 Clutch Control Valve Kit 154740-13K
S2/S3/S4/TCC Clutch Control Valve Kit 154740-11K
S4 Clutch Control Valve Kit 154740-24K
Shift Zip Kit® 8L45-8L90-SHIFT-ZIP
Shuttle Valve Kit 154740-09K
Signal Accumulator Piston Kit 154740-06K
TCC Zip Kit® 8L45-8L90-TCC-ZIP
Tech Resources
April 16, 2024
Watch Out for High Pressure in GM 8L45, 8L90 Valve Bodies
Chris Leach
August 10, 2023
Tips for Success with the GM Transmission Fast Learn Process
Jim Mobley
July 27, 2023
Tips for Tackling 8L45, 8L90 Shift Repairs with Sonnax Signal Accumulator Pistons
Caleb Perham
January 30, 2023
Signal Accumulators & Solenoid Dampers: Their Function & Impact on Drivability Complaints
Maura Stafford
December 12, 2022
Troubleshooting GM 8L45, 8L90 No Move & No Pressure Conditions
Jim Mobley
December 07, 2022
Stop-Start Accumulators: What You Don't Know CAN Hurt You
Matt Allbert
November 03, 2022
How to Identify 8L90 Input Shafts
August 02, 2022
GM 8L90 Model Year 2019 S4/23468 Control Valve Changes
April 06, 2022
Diagnosing the Infamous GM 8L45, 8L90 3-4 Neutral: Check Your Solenoid Wiring Harness Assembly
Jim Mobley
October 01, 2021
GM 8L45, 8L90 Valve Body Layout
April 21, 2021
GM 8L45, 8L90 Vacuum Test Guide
April 21, 2021
Diagnosing 8L45 & 8L90 Shift Complaints: Always Check the VFS Solenoid Circuits
Maura Stafford