SONNAX 77767K "SUPER-HOLD" 4TH. GEAR SERVO PISTON FOR 700R4 4L60E.

THIS IS A NEW SONNAX "SUPER-HOLD" 4TH GEAR SERVO PISTON.

THIS PISTON WILL FIT THESE AUTOMATIC TRANSMISSIONS;

GMC       CHEVY        CADILLAC     OLDSMOBILE       PONTIAC

• 700R4 (4L60) 1989 THRU 1993
• 4L60E 1993-ON
• 4L65E 2001-ON

 THIS SERVO PISTON COMES WITH THESE ITEMS;

1. NEW SONNAX "SUPER-HOLD" 4TH GEAR DUAL PISTON SERVO ASSEMBLY.
2. NEW STEEL WASHER.

4th Gear ?Super-Hold Servo? Piston?

Vehicles with a THM 700-R4 or 4L60-E transmission may experience band failure due to insufficient holding power of the 4th gear servo piston. Install the Sonnax replacement 4th gear servo piston, "The Sonnax Super-Hold Servo," 77767K. The surface area of the new piston has been increased by 40% to increase its holding power. The improved Sonnax piston installs easily into any 700-R4 or 4L60-E application without having to remove the transmission from the vehicle. The new Sonnax piston assembly comes complete with piston, housing, and all the seals necessary to install the assembly. Also available from Sonnax to go with the 700-R4 servo is a replacement seal kit 77767K-SK. Note: This servo affects 4th gear only. It can be used with OEM Corvette or performance 2nd gear servo assemblies.