Actuator filter tapered plug, O-ring, spring and end plug.(2) Accumulator valve springs, end plug and O-ring.Relief valve system plate, valve, spring, e-clip and drill bit.(2) Direct and reverse feed hole cup seals.

Pressure regulator valve spacer, washer, springs and snap ring.

USA-made hardened boost valve and bushing.

Sonnax 4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit. Ships from and sold by Buffalo Engine Components.

Low pressure due to solenoid filter breakup.

Lastly, the EPC boost pressure relief valve system provided helps prevent runaway boost pressure to stop case and valve body wall blow-out due to excess pressure. The included highly improved wide land self-cleaning design boost valve and bushing resists wear so that pressure rise keeps working properly. These changes work in concert with a slight increase in line pressure to greatly improve the overall durability and shift feel of the transmission. This kit includes valve body, case and pump components and modifications designed to deliver increased durability while providing short smooth shifts. On the other hand, the runaway boost pressure problem results in costly broken case, direct drum and piston. With the low boost problem results in complaints of soft 2-3, direct clutch failure as well as the gear ratio and solenoid performance codes. The boost valve assembly is notorious for wear causing both low pressure as well as runaway boost pressure.

Common complaints on this transmission soft 2-3, no upshifts, burnt direct clutch, broken hard parts due to high pressure, low pressure due to solenoid filter breakup as well as gear ratio and solenoid performance codes. This TransGo 4L80E SHIFT KITВ® Valve Body Repair KitВ fits 1991 to 2013 General Motors vehicles equipped with the 4L80E and 4L85E automatic transmission.

Superior 4l60e shift kit