Combine the servo with a custom tune and you have a real winner.

When I get into it I can definitely feel a harder shift. There are two types of servos typically swapped in- one being a stock corvette servo, the other an aftermarket or billet servo with yet an even larger surface area (JET is one example of a manufacturer of these servos) I personally went with the corvette servo because I didn’t want really hard shifts when tooling around with the family.LOL so I went with the corvette servos and not the pins. By speeding up the duration of the shift there is less slippage and in turn less heat, this modification also improves how much the servo holds the shift band (larger surface area of the servo). (NOTE: This does not change the shift point just the actual duration of the shift). This will be the first thing that actually improves the shift. This servo is easy to get to, being that it is accessible from the outside of the transmission, so I don't have to keep breaking open the pan over and over. … The corvette servo will give your transmission 50% more apply pressure, which is just what you need to keep from burning your transmission up under heavy load situations.I am no transmission guy by any means but I called several shops and asked questions regarding the 4L60 transmission and the advantages of installing the corvette servos. Highly recommended upgrades to the 4L60E transmission.Īrguably one of the most inexpensive, yet most rewarding upgrades to your 700R4 or 4L60E (4L65E, 4L70E) transmission is the corvette servo. The manual for my HD (4L80E) says to tow in OD with Tow/Haul engaged unless there is too much shifting in and out of OD. With the auto tranny and 5.3L and 4×4 shortbed, your truck is rated to tow a max of 8k lbs w/3.73 gears and 9k lbs w/4.10’s. In short, an automatic transmission shift kit modifies the transmission’s shift timing in order to dramatically increase shift firmness and durability of the transmission components.

Corvette servo 4l60e transmission