4/5/2023 0 Comments Corvette servo 4l60e![]() ![]() The Powerglide servo doesn’t work like modern servos. Figure 1 - Modern Servo Apply/Release Areas The 5R55W/S OD, AODE OD and 4T60-E 1-2 servos don’t have a larger release area, but they do reduce or exhaust apply pressure when release oil is present, so release is still hydraulically powered. With their smaller apply area and larger release area, servos in these units all have a “proper” reaction area ratio that ensures the band will fully release. ![]() Whether it is C4/C6, 727/48RE, 200-4R or 4L60/E, they all have a servo piston release area that is larger than the apply area, so the release of the servo is hydraulically powered ( Figure 1). A survey of common transmissions confirms this. ![]() In both instances, the servo is released by hydraulic power and does not rely on the spring. Servos used on synchronized shifts either have a release area that is greater than the apply area, or they exhaust apply fluid. No common servos used on a synchronized shift rely on spring-only powered release. For this type of servo, release timing is not critical because the vehicle is not moving.įor servos used on a synchronized shift where the band releases while another element (usually a clutch) applies, release-to-apply timing is far more critical. ![]() For these applications the return spring powers the release of the servo piston. Typical Reverse servos apply and release at idle with the vehicle stopped. For the most part it is business as usual.except for a few performance applications where a deeper understanding of servo operation can make all the difference when trying to make a transmission stand up to higher power. We see fewer servos in later-model transmissions, but we still deal with them when rebuilding older units. ![]()
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