Sonnax 4L60E 77998-03K Pinless 1-2 Accumulator Piston 4L65E 4L70E Transmission
Sonnax Billet Accumulator Piston Part Number: 77998-03K New billet aluminum pinless 1-2 & 3-4 accumulator piston 4L60E, 4L65E, 4L70E, 4L75E transmission GM, Chevrolet, Cadillac, Pontiac, Buick, Oldsmobile, Hummer Package includes one piston. Two can be purchased to replace both the 1-2 and 3-4 piston locations. Stock, these transmissions had plastic pistons that break, burning up your transmission. This piston is very easy to install and is recommended when doing any shift kit. The 1-2 can even be done if you just have the pan off for a fluid change. The valve body doesn’t have to come out for this to be installed. The 3-4 piston does require the valve body to be down. Check out our eBay store for great deals on shift kits and other transmission parts.