Sonnax heavy duty remanufactured valve body GM053-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, plus enhanced input and Forward clutch durability in D3 1st and 2nd Gears.

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.

• Brings on the overrun clutch in D3 1st and 2nd Gears plus OE gear ranges for improved input sprag and Forward clutch durability
• 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
• Heavy duty 2-3 shift valve adds overrun clutch control in D3 1st and 2nd Gear
• Overrun control in D3
• New accumulator control valve and sleeve with spring
• Oversized AFL line up
• New Forward accumulator piston and seal
• New pressure switch manifold
• New EPC solenoid
• New TCC PWM solenoid

Included with your purchase:

• Sonnax line pressure booster kit 4L60E-LB2
• New separator plate and gaskets
• Two new accumulator piston springs
• Sonnax EPC harness adapter 34435-01K for '03-later units