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  • Burnt clutches
  • Line pressure instability
  • Loss of fuel economy
  • No line rise
  • Pressure loss
  • Shift concerns
  • TCC apply & release concerns
  • TCC codes
  • Pressure switch codes


Loss of oil pressure due to worn components in critical oil circuits and/or pressure switch failure.


Recover hydraulic control, restore normal shift operation and save the transmission control unit by installing Sonnax Zip Kit.

6T70 (Gen. 1), 6T75 (Gen. 1)

Zip Kit®
Part No. 6T70-ZIP

View Instructions

Sonnax Zip Kit 6T70-ZIP targets the root cause of multiple concerns by sealing critical circuit pressure losses in First Generation GM 6T70 and 6T75 valve bodies. The kit contains uniquely-designed parts to prevent the loss of pressures within the main line, clutch apply control, actuator feed and lockup control circuits. The kit also seals multiple circuits known to suffer from end plug leakage or poor checkball sealing. No separate special tools are required for installing these parts.

Replacement pressure switch seals and laminate discs in this Zip Kit address various trouble codes related to failures of fluid pressure switches internal to the transmission electro-hydraulic control module (TEHCM). The installation tools included in this kit allow rebuilders to perform switch repairs quickly, easily and safely.

The Zip Kit quick guide provides clear and easy instructions on one sheet to get the unit sealed up and back on the road quickly. In addition to general rebuilding tips and technical information, the technical booklet included in this kit contains vacuum testing information and locations at other key areas of the valve body.

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

Before installing pressure switch repairs, test switches to verify proper electrical operation. This Zip Kit repairs laminate disc and seal failures only, it will not rectify electrical breakdown. See instructions for details.

  • O-Ringed End Plug Kit
  • Isolator Valve Kit
  • Pressure Switch Rebuild Kit Seals (5), Laminate Discs (5), Installation Tool Kit
  • 4-5-6 Accumulator Piston Kit
  • TCC Regulator Apply Valve, Shuttle Valve, End Plug, Spring & O-rings 2 O-rings, 1 Extra
  • AFL Valve, Sleeve, Spring & Clip
  • Checkballs (9) .250" dia.
  • Drill Bit Not Shown
  • Aluminum Plugs (2) 1 Extra, Not Shown

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.

GM 6T70 (Gen. 1), 6T75 (Gen. 1) Valve Body Layout

Gm 6t70 6t75 vbl

December 02, 2014

GM 1st Gen. 6T70 , 6T75 Vacuum Test Guide

Topics: Vacuum Test Guides Vacuum Testing Transmission GM 6T70 (Gen. 1) Transmission 6T75 (Gen. 1) Transmission

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February 19, 2015

Transmission Report: Sometimes the Best Tools are FREE!

Topics: Vacuum Testing Transmission Report Newsletters Diagnostics And Theory Transmission

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July 15, 2014

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

Topics: Diagnostics And Theory Transmission

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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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March 29, 2017

Transmission Report: Sonnax Voted Tops for Parts & Tools!

Topics: Transmission Report Newsletters Transmission GM 4T65-E Transmission 4L70-E Transmission 4L60-E Transmission 4L65-E Transmission 4L80-E Transmission

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  • 6t70 zip

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