4-5-6 - 7 - 8 Reverse Clutch Applies

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

4 - 5 - 6 - 7 - 8 Reverse Control Solenoid

The 4-5-6-7-8 reverse control solenoid is energized allowing ACT FEED to enter the S3 VFS SIG fluid circuit which applies fluid pressure against the S3 VFS Accum spring force and through orifice #34 to the 45678R control valve spring force. This allows 45678R CLU FD fluid to enter the 45678R CLU fluid circuit. 45678R CL FD fluid also enters orifice #34 which is in the 45678R control valve. Fluid then enters the 45678R CL FDBK fluid circuit unseating the #12 ball check valve allowing 45678R CL FDBK fluid into the ACT FD fluid circuit.

#10 Ball Check Valve

45678R CLU fluid enters orifice #55 and unseats #10 ball check valve. This allows 45678R CL fluid to enter the 45678R CL/23468 CL fluid circuit. 45678R CL/23468 CL fluid passes through orifice #56 and into the lube override enable valve. 45678R CL/23468 CL fluid applies pressure against the lube override enable valve spring force. 45678R CL/23468 CL fluid also passes through orifice #57 and into the default override valve.

4 - 5 - 6 - 7 - 8 Reverse Clutch Assembly

45678R CLU fluid is directed through orifice #42 into the 4-5-6- 7-8 rev clutch piston spring force which applies holding force to the 4-5-6-7-8 rev clutch plates.

Default Control Solenoid

The default control solenoid valve is energized allowing ACT FEED fluid to enter the S8 ON/OFF SIG fluid circuit. S8 ON/OFF SIG fluid passes thru orifice #58 thru the lube override enable valve and into the LUBE OVERRIDE fluid circuit which continues to the lube flow regulator valve. S8 ON/OFF SIG fluid is also directed to the #3 ball check valve.