Product Details

Sonnax 77987-01K billet forward accumulator piston for the 1993-up GM 4L60E 4L65E 4L70E 4L75E M30 automatic transmission.

This billet accumulator piston:

From the factory, these transmissions have plastic forward accumulator pistons that can break. If the piston breaks, your transmission will burn up.  This billet aluminum version eliminates this problem.

This piston is very easy to install and is recommended when doing any shift kit. This 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 4L60E and its variants were in production from 1992-2013 and can be identified by the square 16 bolt oil pan and 4 forward gears.  1992-1993 are cross-over years, so your vehicle could have the earlier non-electronic transmission instead.  If unsure of your model, the 4L60E can be differentiated by looking at the wire plug going into the transmission.  The non-electric shift will have a square wire plug with 2-4 wires. The 4L60E will have a round plug with 11 wires.

The 4L60-E was found in the full range of General Motors vehicles including, Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Oldsmobile, Pontiac, and SAAB.

These transmissions can be found in the following vehicles; however you should double check your application with the 16 bolt pan count.  It is common for similar vehicles to have multiple transmission options available from the factory.

Astro Van 1993-2005

Avalanche 2002-2008

Blazer 1993-2005

Bravada 1993-2004

Brougham 1994-1997

Camaro 1994-2002

Canyon 2004-2012

Caprice 1994-1996

Colorado 1994-2012

Corvette 1994-2005

Envoy - XUV - Denali 2001-2010

Escalade, EXT, ESV 1999-2006

Firebird & Trans Am 1993-2002

GTO 2004-2006

Hummer H2 2003-2007

Hummer H3 2006-2011

Impala SS 1994-1996

Isuzu Ascender 2003-2009

Isuzu Hombre 1996-2000

Isuzu Pickup, I280, I350, I290, I370 2006-2009

Fleetwood 1994-1997

Rainier 2004-2007

Roadmaster 1994-1996

SAAB 9-7 2005-2009

Safari Van 1993-2005

Sierra Truck 1993-2013

Silverado Truck 1993-2013

SSR 2003-2007

Suburban 1993-2013

Tahoe 1993-2013

Trailblazer 2001-2009

GMC & Chevy Van 1994-2013

Yukon 1993-2013

These transmissions are part of the Turbo-Hydramatic series and are also known as: 4L60E, 4L60-E, 4L65E, 4L65-E, 4L70E, 4L70-E, 4L75E, 4L75-E, M30, M32, M70