GM 4T60 and 4T60-E units commonly display negative shift characteristics that can be traced to excess wear at the 1-2 and 2-3 accumulator piston pin bores. Slipping, flares, and soft or inconsistent shifts often result, followed by burnt 2nd and 3rd clutches. Extreme cases will cause a loss of 2nd, 3rd and/or 4th Gears. Restore hydraulic control and banish sloppy shifting by reconditioning the pin bore and installing Sonnax oversized accumulator pin 84573-01K.

Salvages accumulator pistons
Oversized pin creates tight hydraulic seal with OE piston
Starter kit 84573-02K includes reamer for boring piston pin bore

More From This Category

Sonnax Shift Detent Spring Retainer, GM, Powerglide, Each

Sonnax Shift Detent Spring Retainer, GM, Powerglide, Each

$5.07

RTS Transmission Flexplate, Converter, Dust Cover, Steel, Black Powdercoated, Chev GM Powerglide

RTS Transmission Flexplate, Converter, Dust Cover, Steel, Black Powdercoated, Chev GM Powerglide

$53.30

MANLEY Connecting Rod Pin Bushing, Bronze, 1.037 in. OD, .929 in. ID, .955 in. Length, Each

MANLEY Connecting Rod Pin Bushing, Bronze, 1.037 in. OD, .929 in. ID, .955 in. Length, Each

$22.80

TCI Clutch Hub, Steel, High Gear, GM, Powerglide, Each

TCI Clutch Hub, Steel, High Gear, GM, Powerglide, Each

$218.57

Motive Gear Differential Master Bearing Kit, Timken, For CADILLAC FLEETWOOD 1991–1996, Kit

Motive Gear Differential Master Bearing Kit, Timken, For CADILLAC FLEETWOOD 1991–1996, Kit

$323.30

Sonnax Servo Release Check Valve Kit, GM, 4L60, 4L60E/65E/70E, Each

Sonnax Servo Release Check Valve Kit, GM, 4L60, 4L60E/65E/70E, Each

$22.45