Transmission Parts GM 4L70-E 4L60-E 4L65-E Valve Body Valve / Sleeve

Symptoms:

No 4th
2-4 Band burned
Low 4th Gear pressure

Cause:

Continuous oscillation in sequence valve bore causes wear that prevents proper hydraulic control.

Correction:

Recover hydraulic control and renew 4th gear operation by reconditioning the bore and installing Sonnax oversized 4-3 sequence valve kit.

Warning:

This kit does not address wear on the inboard two spools. To address wear in that location, use Sonnax oversized 4-3 sequence valve kit 77964-14K.

4L60-E, 4L65-E, 4L70-E

Oversized 4-3 Sequence Valve Kit
Part No. 77964-04K

Tooling:

77964-RM2

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GM 4L60-E, 4L65-E and 4L70-E transmissions often have trouble shifting into or holding 4th Gear due to excess wear in the sequence valve bore. This wear allows vital 4th Gear accumulator oil to exhaust, resulting in deficient servo apply pressure. Consequences are slipping or no 4th Gear operation followed closely by a burnt band. Leaking at the OE end plug also allows oil loss that can leave 4th Gear inoperable. Re-establish hydraulic control and restore normal operation by reconditioning the bore and installing Sonnax oversized 4-3 sequence valve kit 77964-04K.

O-Ringed end plug helps prevent 4th Gear oil loss
Hardcoat anodized aluminum valves combat premature wear

Contents

3-4 Relay Valve
4-3 Sequence Valve
End Plug
O-Ring

Valve Body Layout

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.