Earlier versions of this kit required an aluminum forward piston. It is recommended to follow the specific instructions provided during assembly to avoid a mismatch of parts.
Limitations of the GM 4L60-E, 4L65-E, 4L70-E OE input housing are the root cause of 3-4 burnup in performance applications. The weak OE backing plate flexes during clutch apply, allowing heat to build up unevenly within the clutch pack’s limited space. Stop the flex and you stop 3-4 clutch failure.
Sonnax Smart-Tech input housing kit 77733-06K makes room for a taller clutch pack anchored in place by a stronger backing plate, making it the only way to increase clutch capacity and protect against destructive heat. Numerous other improvements to the housing ensure maximum durability and protection against failure in higher horsepower, higher pressure applications. The housing also is available with a pre-installed, heavy-duty input shaft.
The Smart-Tech input housing kit is the best in the business. Have it in my 4L65E putting down over 700rwhp. Zero issues, no slippage and low temps. Sonnax parts are #1 in my book.N. Rodriguez
Requires '91-later 3-4 apply ring; requires '97-later ring gear; requires '97-later dual-cage return spring; requires '97-later stamped steel forward piston. Cannot be used with aluminum forward piston or Sonnax billet forward piston 77764-01. See instructions for further detail.
February 22, 2016
Topics: Transmission GM 4L70-E Transmission 4L60-E Transmission 4L65-E TransmissionRead Now
March 02, 2016
Topics: Diagnostics And Theory Rebuilding Tips Transmission GM 4L70-E Transmission 4L60 Transmission 4L60-E Transmission 4L65-E TransmissionRead Now
October 16, 2012
Topics: Transmission Report Newsletters Rebuilding Tips Valve Body Reaming Transmission GM 4L70-E Transmission 4L60 Transmission 4L60-E Transmission 4L65-E TransmissionRead Now
July 14, 2016
Topics: Transmission Report Newsletters TransmissionRead Now
February 22, 2016
Topics: Diagnostics And Theory Transmission GM 4L70-E Transmission 4L60 Transmission 4L60-E Transmission 4L65-E TransmissionWatch Now
February 08, 2018
Topics: Rebuilding Tips Transmission GM 4L70-E Transmission 4L60-E Transmission 4L65-E TransmissionWatch Now
Contact a Sonnax Parts Distributor.