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

Sonnax B/Direct Clutch Bushing, Ford, ZF6Hp26/28, 6R80, 34mm

Sonnax B/Direct Clutch Bushing, Ford, ZF6Hp26/28, 6R80, 34mm

$97.59

MANLEY Connecting Rod Pin Bushing, Bronze, 1.424 in. OD, 1.299 in. ID, 1.167 in. Length, Each

MANLEY Connecting Rod Pin Bushing, Bronze, 1.424 in. OD, 1.299 in. ID, 1.167 in. Length, Each

$22.80

Sonnax Secondary Pulley Bearing, JF011E (Re0F10A), Each

Sonnax Secondary Pulley Bearing, JF011E (Re0F10A), Each

$199.77

Sonnax Bondable Yoke, 1310 X 2.00in. Carbon, Each

Sonnax Bondable Yoke, 1310 X 2.00in. Carbon, Each

$256.53