For 4L60E 4L65E 4L70E Pinless Forward Accumulator Piston Kit 1-2 and 3-4

Pinless Forward Accumulator Piston Kit

This pinless forward accumulator piston kit eliminates oil leaks and stabilizes shift quality in compatible automatic transmissions.

Overview

This pinless forward accumulator piston kit is designed to repair worn transmission accumulator bores without requiring costly housing replacements. The pinless forward accumulator piston kit uses dual seals to stabilize the piston and eliminate fluid bypass that causes harsh gear shifts. Professional transmission builders rely on this kit to restore smooth 1-2 and 3-4 gear transitions.

Built For Performance

• Pinless design prevents wear on the accumulator pin bore to eliminate leak paths.
• Equipped with dual PTFE seals to ensure positive sealing and reduce friction.
• Machined from durable aluminum alloy to withstand high hydraulic pressures.
• Includes steel ball seals to securely plug the original pin guide hole.

Fits These Machines

• for 4L60E transmissions
• for 4L65E transmissions
• for 4L70E transmissions

On-The-Job Use

• Rebuilding transmission valve bodies during standard maintenance intervals.
• Correcting harsh, slipping, or delayed 1-2 and 3-4 shift characteristics.
• Preventing internal fluid cross-leaks that degrade transmission clutches.

Specs At A Glance

Good To Know

Q: What is the primary benefit of a pinless accumulator piston? A: The pinless design eliminates the center pin, which is a common source of fluid leaks as the transmission housing wears down over time.

Q: Do I need special tools to install this accumulator piston kit? A: Standard transmission assembly tools are sufficient, but ensure the bore is thoroughly cleaned before inserting the new piston.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.