4L60E 1-2 Accumulator Piston fits GM (93-Up)

4L60E 1-2 Accumulator Piston (Below Valve Body, Small Pin Hole) – Compatible for GM 1993-Up

Eliminate that annoying hard 1-2 upshift “clunk” with this precision 1-2 accumulator piston from Stellar Automotive Group.

This is the correct lower accumulator piston (mounted below the valve body) with the factory small pin hole orifice that cushions the 1-2 shift. A cracked piston or worn seal leaks pressure, slamming the 1-2 band and causing harsh shifts or band burnout. This direct-replacement molded piston with permanently bonded rubber seal and exact small pin hole restores the factory-soft 1-2 upshift every time — perfect for daily drivers, tow vehicles, or performance builds.

Perfect fit for all 1993-Up models including:

• Chevrolet/GMC Silverado, Sierra, Suburban, Tahoe, Yukon
• Chevrolet Camaro, Corvette
• Cadillac Escalade
• All 4L60E, 4L65E, 4L70E applications

Symptoms of a failing 1-2 accumulator piston:

• Hard bang or clunk on 1-2 upshift
• Delayed then harsh 1-2 shift
• 1-2 band burnout on teardown
• No cushion even with valve body mods

Don’t let a $30 piston ruin your shift quality — install the Stellar Automotive Group small-pin-hole accumulator piston and enjoy buttery-smooth 1-2 shifts again.

Note: All parts are distributed, not designed or manufactured, by Stellar Automotive Group.

Add this must-have 4L60E upgrade to your cart today and feel the difference on every 1-2 upshift!