Low/Reverse Clutch Assembly

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

Low/Reverse Clutch

For low/reverse clutch operation, REFER to: Low/Reverse Clutch Assembly .

Low/Reverse Clutch

Condition	Possible Sources	Action
Low/Reverse clutch does not apply	SSD solenoid filter blocked	CLEAN or INSTALL a new solenoid. Refer to: Shift Solenoids (SS) .
	SSD is mechanically stuck OFF	INSTALL a new solenoid. Refer to: Shift Solenoids (SS) . PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download .
	Low/Reverse clutch (CBLR/C456) regulator valve stuck OFF	DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve. If bore or valve is damaged, INSTALL a new main control. Refer to: Main Control Valve Body .
	SSD SIG, CBLR/C456 SUPPLY, CBLR SUPPLY hydraulic circuits blocked/leaking	DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. CLEAN as necessary. Refer to: Main Control Valve Body .
	REV/SSE SIG to multiplex shift valve shuttle ball missing/damaged	REMOVE the main control valve body and INSPECT the check ball missing/damage. Refer to: Main Control Valve Body .
	Multiplex shift valve stuck in default position	DISASSEMBLE, CLEAN and INSPECT the multiplex shift valve. If bore or valve is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body .
	CBLR supply hydraulic circuit blocked or leaking	DISASSEMBLE and INSPECT the transmission cover passages for debris/blockage. CLEAN as necessary. Refer to: Transmission .
	Rear planetary carrier/center ring gear	INSPECT the planetary carrier/center ring gear for wear and damage that would prevent the gear from being held. INSTALL new components necessary. Refer to: Transmission .
	Low/Reverse clutch friction plates	DISASSEMBLE and INSPECT the low/reverse clutch friction and steel plates. INSTALL new components as necessary. Refer to: Transmission .
	Low/Reverse clutch piston seal leakage	INSTALL a new low/reverse clutch piston and seals. Refer to: Transmission .
Low/Reverse clutch always applied	SSD solenoid filter seal damaged	INSTALL a new solenoid. Refer to: Shift Solenoids (SS) .
	SSD mechanically stuck ON	INSTALL a new solenoid. Refer to: Shift Solenoids (SS) . PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download .
	Low/Reverse clutch (CBLR/C456) regulator valve stuck ON	DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve and spring. If bore or valve is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body .
	SSD SIG, CBLR/C456 SUPPLY, CBLR SUPPLY hydraulic circuits blocked/leaking	DISASSEMBLE and INSPECT the main control valve body and separator plate passages for leakage. CLEAN as necessary. Refer to: Main Control Valve Body .
	Low One-Way Clutch (OWC)	INSPECT the Low One-Way Clutch (OWC) for free rotation in over-run direction. INSTALL new components as necessary. Refer to: Transmission .
	Low/Reverse clutch friction plates	DISASSEMBLE and INSPECT the low/reverse clutch friction and steel plates. INSTALL new components as necessary. Refer to: Transmission .
	Low/Reverse clutch piston return spring	INSPECT the return spring for damage. INSTALL new components as necessary. Refer to: Transmission .
Low/Reverse clutch delayed/soft/slipping apply	Incorrect Transmission Strategy programmed into PCM	PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download .
	SSD solenoid filter seal damaged	INSTALL a new solenoid. Refer to: Shift Solenoids (SS) .
	SSD mechanically sticking	INSTALL a new solenoid. Refer to: Shift Solenoids (SS) .
	Low/Reverse clutch (CBLR/C456) regulator valve sticking	DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve. If bore or valve is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body .
	Low/Reverse clutch (CBLR/C456) boost valve stuck ON	DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch boost valve. If bore or valve is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body .
	SSD SIG, CBLR/C456 SUPPLY, CBLR SUPPLY hydraulic circuits blocked/leaking	DISASSEMBLE and INSPECT the main control and separator plate passages for debris/blockage. CLEAN as necessary. Refer to: Main Control Valve Body .
	REV/SSE SIG to multiplex shift valve shuttle ball missing/damaged	REMOVE the main control valve body and INSPECT the check ball missing/damage. Refer to: Main Control Valve Body .
	CBLR supply hydraulic circuit blocked or leaking	DISASSEMBLE and INSPECT the transmission cover passages for debris/blockage. CLEAN as necessary.
	Low/Reverse clutch friction plates	DISASSEMBLE and INSPECT the low/reverse clutch friction and steel plates. INSTALL new components as necessary. Refer to: Low/Reverse Clutch Assembly .
	Low/Reverse clutch piston seal leakage	INSTALL a new low/reverse clutch piston and seals. Refer to: Low/Reverse Clutch Assembly .
Low/Reverse clutch harsh apply	Incorrect Transmission Strategy programmed into PCM	PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download .
	SSD mechanically sticking	INSTALL a new solenoid. Refer to: Shift Solenoids (SS) . PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download .
	Low/Reverse clutch regulator valve sticking	DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve and spring. If bore, valve or spring is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body .
	Low/Reverse clutch (CBLR/C456) boost valve sticking	DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch boost valve and spring. If bore, valve or spring is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body .
	SSD SIG, CBLR/C456 SUPPLY, CBLR SUPPLY hydraulic circuits blocked/leaking	DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. CLEAN as necessary. Refer to: Main Control Valve Body .
	Low/Reverse clutch friction plates	DISASSEMBLE and INSPECT the low/reverse clutch friction and steel plates. INSTALL new components as necessary. Refer to: Transmission .
	Low/Reverse clutch piston return spring	INSPECT the return spring for proper installation and damage. INSTALL new components as necessary. Refer to: Transmission .