Sonnax 4th Gear super hold dual servo kit 77767K features 40% more apply surface area for greater holding power in GM 4L60 (700-R4), 4L60-E, 4L65-E and 4L70-E units. Vehicles with these transmissions often exhibit poor 3-4 shift quality and experience band failure in performance applications. Combine this servo kit with Sonnax 2nd gear servo 77911-03K for unmatched holding power and shift performance that's an easy in-vehicle install.

Patented dual-piston design with 40% more apply delivers greater holding power
D-ring seals prevent pressure loss
Use with OE “Corvette” or Sonnax 2nd Gear servo assemblies

More From This Category

TCI Input Shaft, Vaccu melt 300, GM, TH350, TH400, Powerglide Spline, Each

TCI Input Shaft, Vaccu melt 300, GM, TH350, TH400, Powerglide Spline, Each

$1,478.27

Sonnax Bell Housing Bushing, GM, Th180C(3L30), 4L30-E, Ar25, Ar35, Each

Sonnax Bell Housing Bushing, GM, Th180C(3L30), 4L30-E, Ar25, Ar35, Each

$6.40

Motive Gear Differential Bearing Kit, Timken, For DODGE VIXEN 1990–1992, Kit

Motive Gear Differential Bearing Kit, Timken, For DODGE VIXEN 1990–1992, Kit

$176.92

TCI Servo Sealing Ring, GM, TH400, Kit

TCI Servo Sealing Ring, GM, TH400, Kit

$64.58

Sonnax Heavy Duty Input Shaft, Chrysler, 47RE, 47RH, 48Re, Each

Sonnax Heavy Duty Input Shaft, Chrysler, 47RE, 47RH, 48Re, Each

$1,716.10

PHC Clutch Bearing, Release, For Mercedes Benz 180 1.8 Ltr W201, 1/91-12/94 1991-1994, Each

PHC Clutch Bearing, Release, For Mercedes Benz 180 1.8 Ltr W201, 1/91-12/94 1991-1994, Each

$59.46