Sonnax 22990-01 Boost Valve Spring Retainer for Chrysler Transmissions

The Sonnax 22990-01 boost valve spring retainer is a heavy-duty steel replacement component designed to solve a common failure point in various Chrysler automatic transmissions. This retainer secures the TCC boost valve and spring assembly in the valve body, preventing oil pressure loss that can affect transmission performance.

Solves Common OE Failure:

The original equipment retainer in these transmission applications is prone to cracking and breaking under normal operating conditions. When the OE retainer fails, it allows the boost valve and spring to fall out of position, causing a loss of 4th gear and torque converter clutch (TCC) oil pressure. The Sonnax 22990-01 eliminates this problem with superior construction and materials.

Key Features:

• Constructed from heavy-duty steel for maximum durability and wear resistance
• Significantly stronger than original equipment U-shaped bracket design
• Prevents boost valve and spring displacement that causes pressure leaks
• Sold in packages of 5 retainers for multiple rebuilds or service work
• Direct replacement for OEM part numbers 5001388BN and 12741C-4
• Fits Chrysler, Dodge, Jeep, and Mitsubishi transmission applications

Compatible Transmissions:

42RE, 42RH, 44RE, 44RH, 46RE, 46RH, 47RE, 47RH, 48RE, A500, A518, A618, A727, A904

This is an essential component for transmission rebuilders and repair shops working on Chrysler family automatic transmissions from the late 1980s through 2010s. The upgraded steel construction ensures long-lasting performance and eliminates repeat failures associated with the factory retainer.