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Automatic Transmission

A New Trick in the Bag

For years we have known that the 4L60 and 4L60-E second-gear servo came in three different sizes. Now there is a fourth OEM servo size that gives builders a new choice when looking for something with increased performance.

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By Gregg Nader
Gregg Nader is a Sonnax product development manager for high performance and heavy-duty transmission components. He is also a member of the Sonnax TASC Force (Technical Automotive Specialties Committee), a group of recognized industry technical specialists, transmission rebuilders and Sonnax Industries Inc. technicians.
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A New Trick in the Bag TASC Force Tips Author: Gregg Nader GM has an additional second-gear servo size for the 4L60-E

TASC Force Tips

  • Author: Gregg Nader

GM has an additional second-gear servo size for the 4L60-E

For years we have known that the 4L60 and 4L60-E second-gear servo came in three different sizes. Now there is a fourth OEM servo size that gives builders a new choice when looking for something with increased performance.

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The 8642553 casting used in V-6 and V-8 applications is by far the most-common size we see. However, if you are looking to add “a little extra” to a heavy-duty rebuild and want a little more second-band apply area but the Corvette or larger aftermarket servo is just too much for a daily driver, try the new 4L70-E servo. This is available from the dealer for about $40. You will need to order two part numbers, 24230441 piston and 24229157 divider/housing.

Compared with the Corvette servo, the 4L70-E servo is a modest increase in size over the V-6/V-8 servo (8642553 casting), and it will not change the shift feel as dramatically as a Corvette or a larger aftermarket servo would. There are plenty of options to change shift feel and upgrade this common transmission. This new 4L70-E servo is one more part you can add to your bag of tricks.

Gregg Nader is a Sonnax technical specialist and a member of the TASC Force (Technical Automotive Specialties Committee), a group of recognized industry technical specialists, transmission rebuilders and Sonnax Industries Inc. technicians.

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