Sonnax Heavy Duty Remanufactured Valve Body

Heavy Duty Remanufactured Valve Body
Part No. GM054-HD

Fits ’96–’08 units. Prevents input sprag and Forward clutch failure by engaging overrun clutch in D4 1st, 2nd and 3rd Gears and D3 1st and 2nd Gears. Includes fluid rerouting for additional D4 protection and new servo cushion spring to reduce downshift clunk.

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Lay the perfect foundation for work trucks and muscle cars alike with premium remanufactured valve bodies from Sonnax. Heavy duty remanufactured valve body GM054-HD prevents input sprag and forward clutch failure by engaging overrun clutch in D4 1st, 2nd and 3rd Gears and D3 1st and 2nd Gears for added holding capacity. This is a great advantage when towing, as there is no need to drop down to D3 for enhanced holding power when cruising at highway speeds and wanting more throttle.

Ideal for vehicles with increased horsepower and torque, GM054-HD is built to overcome chronic shift and converter clutch apply complaints. It provides firmer shifts and a moderately increased pressure curve to improve performance, especially in truck and towing applications.

Numerous Sonnax valve upgrades are included to restore hydraulic clearances that lead to shift complaints, clutch distress, converter complaints and codes, solenoid issues and pressure problems. Line pressure rise has been moderately increased to overcome shift complaints, delayed engagements, and to increase holding power to the clutches.

To guarantee the highest level of operational performance, this remanufactured valve body is tested on state-of-the art equipment to verify that solenoid feed, clutch, converter and line pressures match or exceed OE specifications.

Sonnax components outperform and outlast OE to eliminate chronic shift and converter apply problems
Firmer shifts under load and moderately increased line pressure improve transmission performance and durability

The valve body includes the following:

Oversized TCC regulator valve and sleeve, and limit valve spring for firmer TCC application
O-Ringed bore plugs and abuse plugs
New accumulator control valve and sleeve with spring
Oversized AFL lineup
New Forward accumulator piston and seal
New pressure switch manifold
New EPC solenoid
New TCC PWM solenoid
New servo cushion spring to help reduce downshift clunk

Included with your purchase:

Sonnax boost valve assembly with elevated pressure regulator spring, 4L60E-LB2
New separator plate and gaskets
Two new accumulator piston springs
Sonnax EPC harness adapter 34435-01K for ’03-later units
.250" Checkballs

Range	Gear	Overrun Clutch
		OE Valve Body	GM053-HD	GM054-HD
Park
Reverse
Neutral
D4	1^st			Applied
	2^nd			Applied
	3^rd			Applied
	4^th
D3	1^st		Applied	Applied
	2^nd		Applied	Applied
	3^rd	Applied	Applied	Applied
2	1^st	Applied	Applied	Applied
2	2^nd	Applied	Applied	Applied
1	1^st	Applied	Applied	Applied
1	2^nd	Applied	Applied	Applied

Note

The two accumulator springs are the same, colors may vary. These springs provide a "stock" shift feel to any previous alterations. The modifications made to prevent input sprag and forward clutch protection in OD could result in a slight coastdown shift feel difference, which is minimized with the installation of the servo cushion spring.

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