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Accumulator Valvetrain Assy

Accumulator Valvetrain Assy

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Quick Overview



Vehicles with a GM 200-4R, 700-R4, or 4L60-E transmission can experience 1-2 light
throttle abrupt or “bang” shifts, especially when using the “093” Corvette or “553” 2nd apply
servo pistons. The traditional solution is to make the servo piston apply diameter smaller,
however this limits the 2-4 band life. This shift problem 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.
This valve train has multiple OE size variations, including B, A, N, M, L, K, and F. The
size variations are clearly stamped with the letter on the aluminum sleeve. Most vehicles,
depending upon the transmission/engine combination, can use either the M, L, or K version.
However, these are not available unless scavenged from other valve bodies. Sonnax offers two
replacement accumulator valve train kits: 77777M-K for the M (.341" valve diameter) and
77777L-K for the L (.330" valve diameter).

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