Input housing failure at the shaft and forward piston areas is common in high-torque 4L60, 4L60-E, 4L65-E and 4L70-E transmissions. Sonnax input housing forward sleeve kit 77733-52K is used in combination with a Sonnax overrun sleeve to greatly increase the maximum strength of the housing and prevent these failures.
Installation of an overrun sleeve — available with Sonnax input housing overrun sleeve kit 77733-51KA and Smart-Tech input housing kits — is a common durability upgrade in these units. Even with an overrun sleeve, though, a large portion of the input shaft and aluminum housing spline connection remains unsupported. Adding the Sonnax forward sleeve kit nearly doubles support in this area, making it a recommended component for all high torque capacity work/sport vehicles.

Increases input housing torque capacity
Maintains OE forward piston apply area
Combine with a Sonnax overrun sleeve for easy upgrades of older builds or new heavy-duty/high performance builds

More From This Category

Cast Piston

Cast Piston

$100.64

KB Piston, 4 in. Bore, For Ford 302 Rod 5.090 Hollow Dome -14.7cc 2V, .060 Oversized, w/ Rings, Each

KB Piston, 4 in. Bore, For Ford 302 Rod 5.090 Hollow Dome -14.7cc 2V, .060 Oversized, w/ Rings, Each

$1,150.95

Motive Gear Differential Bearing Kit, Koyo, For AM GENERAL HUMMER 1992–2001, Kit

Motive Gear Differential Bearing Kit, Koyo, For AM GENERAL HUMMER 1992–2001, Kit

$256.79

Motive Gear Nv4500 M/S Chev P-Series (Bolt, Each

Motive Gear Nv4500 M/S Chev P-Series (Bolt, Each

$404.23

TURBOSMART Boost Reference Adapter, For VW Golf GTI Mk5/6, Black, Each

TURBOSMART Boost Reference Adapter, For VW Golf GTI Mk5/6, Black, Each

$61.67

Wilwood Caliper, AERO4-DS, Radial, 0.81 in. Rotor Width, 15.00 in. Rotor Dia, 1.12/1.12 in. Bore, Universal, Alum, Black, Each

Wilwood Caliper, AERO4-DS, Radial, 0.81 in. Rotor Width, 15.00 in. Rotor Dia, 1.12/1.12 in. Bore, Universal, Alum, Black, Each

$871.85