New Sonnax GM Externally Adjustable Low/Reverse Servo Kits

New Sonnax GM Externally Adjustable Low/Reverse Servo Kits

Checking the rear band adjustment on drag racing GM TH400 and 4L80-E vehicles is critical for keeping the transbrake ready for proper launch, but it’s never been easy to do with OE and most aftermarket-style low/reverse servos.

Featuring a unique design, these two new externally adjustable low/reverse servo kits from Sonnax make it quick and easy for anyone to check and adjust the rear band for improved reliability and consistent, predictable staging.

  • Fits TH400: 34914-20K
  • Fits 4L80/85-E: 34914-28K

www.sonnax.com

GEARS Staff

GEARS Magazine Staff Members.

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