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Symptoms:

  • Broken parts due to excessive line pressure
  • Excess heat
  • Firm shifts
  • Flare shifts & bind-ups
  • Delayed engagement
  • Harsh engagement

Cause:

Loss of oil pressure due to worn components in critical oil circuits.

Correction:

Zip Kit seals critical pressure losses and restores and extends accumulator action.

ZF6HP21, ZF6HP28, ZF6HP34

Zip Kit®
Part No. ZF6-GEN2-ZIP

View Instructions

Sonnax Zip Kit ZF6-GEN2-ZIP targets the root cause of multiple complaints by sealing the critical circuit pressure losses in listed valve bodies. The kit contains uniquely designed parts to prevent the loss of pressures within the main line, solenoid regulator, reverse, clutch control and solenoid apply circuits with no special tools required.

The Zip Kit quick guide provides clear and easy instructions on one sheet to get the unit sealed up and back on the road fast. In addition to general rebuilding tips and technical information, the technical booklet included in this kit contains vacuum testing and additional repair options for higher mileage units or for repairing specific complaints which are beyond the scope of this kit.

  • No reaming required
  • Installs quickly with no special tools required
  • Uniquely designed parts address root causes of valve body complaints by sealing critical pressure circuits
  • Detailed technical booklet included with in-depth rebuild and inspection tips for comprehensive valve body repair

This Zip Kit ZF6-GEN2-ZIP is designed for ZF6HP21/28/34 (Generation 2) applications only. A separate Zip Kit ZF6-6R60-ZIP is available for ZF6HP19/26/32 (Generation 1) and Ford 6R60/6R80 applications. To verify valve bodies, see this identification guide for further details.

  • Accumulator Piston Kits (7)
  • Testing Nut
  • Testing End Plug
  • Pressure Regulator Sleeve
  • O-Ringed Internal End Plug Kit
  • Replacement Solenoid O-Rings 31 various pieces
  • O-Ringed End Plug Kit
  • Clutch A & E Control Boost Valve Kit (2)

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

ZF6HP21/28/34 (Generation 2) Valve Body Layout

Zf6hp21 28 34 gen 2

January 14, 2014

ZF6HP19/26/32 (Generation 1), Ford 6R60, 6R75, 6R80, ZF6HP21/28/34 (Generation 2) Identification Guide

Topics: Identification Guides Transmission Ford ZF ZF6HP19 Transmission ZF6HP26 Transmission ZF6HP32 Transmission ZF6HP21 Transmission ZF6HP28 Transmission ZF6HP34 Transmission 6R80 Transmission 6R60 Transmission

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March 23, 2016

Six Ways from Sunday: Diagnosing ZF6 & Ford 6R60/80 TC-Related Drivability Concerns

Bob Warnke

Topics: Diagnostics And Theory Transmission Torque Converter ZF Ford ZF6HP19 Transmission ZF6HP26 Transmission ZF6HP32 Transmission ZF6HP21 Transmission ZF6HP28 Transmission ZF6HP34 Transmission 6R80 Transmission 6R60 Transmission

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December 21, 2012

ZF6HP21/28/34 (Gen. 2) Vacuum Test Guide

Topics: Vacuum Testing Vacuum Test Guides Transmission ZF ZF6HP21 Transmission ZF6HP28 Transmission ZF6HP34 Transmission

Read Now

July 15, 2014

Zip Kit® Video - The first step in correcting common shift problems.

Topics: Diagnostics And Theory Transmission

Watch Now

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

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  • Zf6 gen2 zip web
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The Sonnax ZIP KIT®

The First Step in Correcting Common Shift Problems

It's easy to restore and extend vehicle shift quality with Zip Kits. Uniquely designed Sonnax parts target the root cause of valve body complaints and stop critical circuit pressure losses in the most common problem areas of the transmission.

Learn More About Sonnax Zip Kits