Sonnax super hold servo kit 28821-09K is an all-in-one upgrade ideal for a competitive edge in GM Powerglide applications where racers are looking to reduce line pressure to free up horsepower. The kit's dual piston design features 30% more apply area to increase band apply force at your current line pressure or allow you to reduce line pressure by 20% to 30% while maintaining the same apply force.
Hands down your Powerglide super hold servo kit finally cured my problems I chased for months. Looking forward to making the switch this off season to your Smart-Tech drum.T. Cannon
A common question is, "I have an extreme application, when would I choose the Smart-Tech servo over the Sonnax super hold?"
Both are track-proven in today’s high-power vehicles. With its ratio-style release and supported pin design, the Smart-Tech is the best all-around upgrade that eliminates EVERY problem associated with the OE servo. Racers looking to reduce line pressure for greater efficiency will most benefit from the super hold servo’s 30% more apply area.
April 27, 2016
Topics: Diagnostics And Theory Transmission GM Powerglide TransmissionRead Now
April 26, 2016
Topics: Diagnostics And Theory Transmission GM Powerglide TransmissionWatch Now
Contact a Sonnax Parts Distributor.