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More than Great Products

Created by rebuilders, for rebuilders, Sonnax Technical Resources contains hundreds of valuable articles, videos and more to help you find the best solutions to everyday automotive issues. Whether you’re researching a specific problem with a unit that’s just come into your shop or seeking rebuilding tips and tricks from the pros, this section is where you can easily search 10+ years of free Sonnax tech for answers.

Check back often to see what’s new, or connect with Sonnax to be the first to know about the latest tech resources.

May 31, 2009

A New Trick in the Bag: Additional Second-Gear Servo Size for the 4L60-E

Gregg Nader

Topics: Rebuilding Tips Transmission GM 4L70-E Transmission 4L60 Transmission 4L60-E Transmission 4L65-E Transmission

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April 27, 2016

Understanding & Overcoming the Powerglide Servo Pin Bias Effect - Part 1

Topics: Diagnostics And Theory Transmission GM Powerglide Transmission

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January 02, 2004

High Performance Converters: Stall Speed, Core Selection, and More

Joe Allen and Andy Dumas

Topics: Diagnostics And Theory Torque Converter

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February 23, 2015

Chasing Bearing Noise in the JF011E CVT

Jim Dial

Topics: Diagnostics And Theory Transmission Nissan Jatco JF011E (RE0F10A) Transmission JF010E (RE0F09A) Transmission

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July 09, 2015

Flange Yoke Showdown

Topics: Driveline

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January 31, 2013

Proper Reamer Care

Topics: Valve Body Reaming Shop Practices Transmission

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January 24, 2012

Tips for Aligning Torque Converter Clutch Linings into Covers

Rick Morris

Topics: Bonding Tips Torque Converter Chrysler 10-3/4" LU Late Production Torque Converter

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September 23, 2014

6L80/6L90 "No Movement" After Repair

Topics: Diagnostics And Theory Transmission GM 6L90 Transmission 6L80 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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March 24, 2010

4L80-E Overheating Due to Negative Clearance

Ed Lee

Topics: Diagnostics And Theory Torque Converter GM 4L80-E (Early Single Stator) Torque Converter 4L80-E (Late Single Stator) Torque Converter

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November 29, 2016

“8” Ball, Center Pocket? Location and Function of New #8 Checkball for 6L80/90

Jim Dial

Topics: Diagnostics And Theory Rebuilding Tips Checkball Locations Transmission GM 6L90 Transmission 6L80 Transmission

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July 28, 2006

Converter Surgery 101: Cutting Open Converters

Ed Lee

Topics: Shop Practices Diagnostics And Theory Torque Converter

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July 07, 2009

Catching a Brake on Shift Problems

Ed Lee

Topics: Diagnostics And Theory Transmission

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November 24, 2011

Salvaging the Cover on Overheated Honda Converters

Ed Lee

Topics: Torque Converter Honda/Acura B36A/P36A, Odyssey '07-'09 Torque Converter

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October 24, 2010

Upgrading the Flat TCC Pistons for the 4L30-E & 4T65-E

Ed Lee

Topics: Rebuilding Tips Torque Converter GM 258mm LU (4T65-E) Torque Converter

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September 24, 2010

Premature Failure of Mitsubishi Galant Ring Gears

Ed Lee

Topics: Torque Converter Mitsubishi F4A42 Torque Converter

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July 02, 2006

A Clutch Call: What 740/1740 Codes can Reveal about Chrysler Converter Flow

Ed Lee

Topics: Diagnostics And Theory Torque Converter

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April 24, 2013

Bonding BorgWarner Friction Rings

Steve Jaussaud

Topics: Bonding Tips Torque Converter

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July 20, 2016

Give 'Em the Slip - Avoid Comebacks with Sonnax Slip Yokes

Topics: Diagnostics And Theory Driveline

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October 24, 2016

Even Odds: Keeping Customers Happy by Playing the “Right to Repair” Card

Brian Wing

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