#4L60E SERVO ASSEMBLY DIAGRAM INSTALL#

*If you cannot install the Wire Retainer AND/OR you cannot rotate the drive shaft.Shorten the Apply Pin in. You may need a strap wrench for this if you lack upper body strength. *With the trans in neutral, Try to rotate the drive shaft in BOTH directions, The direction with the most drag Overruns the Reverse Input Drum that the 2-4 Band rides on. *IF your able to get the Wire Retainer to seat into it's groove. *Assemble & Attempt to install the entire Servo Assembly MINUS ANY seals at this time! You can also omit the Return Spring for now! *Assemble the Apply Pin to the 2nd Servo Piston with the small spring/washer/E-Clip. *Using the instructions with the Sonnax Apply Pin as a guide.Grind approximately 1/8'-.125' off the tip. *Using a vise.Assemble the steel cover & 2 cushion springs into the Vette/093 2nd piston & install the snap ring. *Install GM 8681195 Inner Cushion Spring inside the original Cushion Spring with the Small end of the spring facing the steel cover. *Grind/Mill 4 oil exit notches in the Steel Cover as shown, This keeps oil from hydro-locking between the Cover & 2nd Piston rendering the Cushion Spring ineffective, Also helps 3-2 downshifts stay clean! *Retain the Small Spring, E-Clip, Washer, Steel Cover, 4th Piston, Case Cover, Large Cushion Spring, And the Return Spring shown to the Left. I use the socket against the steel cover with the apply pin removed instead of how it's shown in the below TransGo instruction sheet. *Using a Vise & shallow 3/4'-19mm socket, Remove the snap ring from the 2nd Piston with an Awl or small flat blade. *Drive the Apply Pin through the 2nd Piston, Don't worry about damaging the piston as it will not be reused.The 4th Piston likes to 'mushroom' the shoulder of the pin. *Disassemble the Servo Assembly by removing the small E-Clip & spring on the end of the apply pin. *Clean the dirt/debris out the bore, Mainly where the snap-ring rides in the case with a lint-free cloth/towel. *Remove the 2nd & 4th Band Servo from the side of the trans case, I'm sure there are several videos on Youtube for this! The object here is to Increase Clamping Power applied to the 2-4 Band during a 1-2 shift while getting rid of the 'Slid Bump'.It's a delicate process that took several different combinations for me to get right on GMT800 4.8L/5.3L trucks & SUV's.

4l60e servo assembly diagram