Sonnax 77777M-K Accumulator Valve Train Kit for GM 200-4R 700-R4 4L60 4L60-E

The Sonnax 77777M-K is a replacement accumulator valve train kit designed for the M version with a .341" valve diameter, specifically engineered for heavy weight vehicles equipped with GM 200-4R, 700-R4, 4L60, and 4L60-E transmissions.

This drop-in accumulator valve train kit eliminates oil loss and maintains holding power to ensure proper shift feel. It addresses shift problems that can occur due to sleeve wear allowing torque signal and/or accumulator pressure leakage, or when the accumulator valve is too large for the application, resulting in too much pressure on the 2-4 band.

Key Features:

• Sleeve manufactured from high-quality aluminum designed to prevent excessive wear due to the reciprocating motion of the steel valve
• Kit contains three springs of varying spring rates to choose from for customized shift calibration
• .341" valve diameter for M version applications
• Fits M version valve trains in heavy weight vehicles only; fits 4L60 '87-later auxiliary valve body styles only

Kit Includes:

• Accumulator valve (.341" diameter)
• Aluminum sleeve
• Plug
• Three springs (3 lb., 5 lb., and 7 lb. spring rates)

This kit is ideal for heavy cars and trucks with high axle ratios (3.08-3.23-3.42) and provides adjustable shift firmness options through spring selection to match your specific vehicle application and driving preferences.