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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.

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October 16, 2024

Prevent RFE, RH/RE Converter Failure: Maintain Proper TCC Apply Pressure

Jim Dial

September 16, 2024

Building a Basic Vacuum Testing Tool Kit

Randall Schroeder

August 13, 2024

Chrysler RFE Valve Bodies: Understanding Checkball Locations & Function

Jim Mobley

August 12, 2024

4L80-E Shift Lever Kit for Custom Transmission Builds

August 05, 2024

ZF 8-Speeds: How to Properly Fill with ATF

Jim Mobley

August 05, 2024

Transmission Report Newsletter: August 2024

July 12, 2024

4L60-E Series Input Shaft, Stator & Pump Cover Compatibility: Three Easy Checks

Caleb Perham

July 12, 2024

4L60, 4L60-E Stator Tube Swap: Close Only Counts in Horseshoes

Gregg Nader

June 04, 2024

GM 9T45, 9T50, 9T60, 9T65 Vacuum Test Guide

May 07, 2024

Torque Converter Can of Worms: Lockup & Aftermarket Programming

Randall Schroeder

April 22, 2024

Transmission Report Newsletter: April 2024

April 16, 2024

Watch Out for High Pressure in GM 8L45, 8L90 Valve Bodies

Chris Leach

March 28, 2024

Toyota/Lexus UA80E/F, UB80E/F Valve Body Layout

March 11, 2024

Shift of the Shaft! Diagnosing Chrysler 48RE Manual Shaft Issues

Randall Schroeder

February 23, 2024

Tips & Tricks – Making Light Work of Switch Valve End Plug Testing

Randall Schroeder

February 08, 2024

Diagnosing Ford 10R60, 10R80 & 10R140 Series Speed Sensor Issues

Jim Mobley

January 09, 2024

Easy TH400, 4L80-E Reverse Servo Setup: Craft Your Own Tool

Caleb Perham

December 21, 2023

6L80, 6L90 300mm Converter Heavy-Duty Builds Explained

December 20, 2023

AODE, 4R70W Series Bypass Clutch Control Valve Repair Options: When to Use Sonnax 76948-04K vs. 76948-64K

Tory Royce

December 15, 2023

Transmission Report Newsletter: December 2023

December 11, 2023

Understanding Lube Flow Control Valves in Toyota/Lexus UA80, UB80 Transmissions

Jim Dial

December 04, 2023

How to Easily Remove & Replace a 6L80, 6L90 Output Planetary Lube Dam

November 29, 2023

Ford 10R60, 10R80, 10R90; GM 10L60/80/90 (Gen. 1) Vacuum Test Guide

November 29, 2023

ZF8 Valve Body Separator Plate Application Chart

November 08, 2023

Toyota/Lexus UA80E, UA80F, UB80E, UB80F Vacuum Test Guide

November 02, 2023

Jatco/Nissan JF010E (RE0F09A, RE0F09B) Vacuum Test Guide

August 10, 2023

Tips for Success with the GM Transmission Fast Learn Process

Jim Mobley

July 28, 2023

6L80, 6L90 Remanufactured TEHCMs for Top-Quality, Affordable Repairs

July 28, 2023

6L80, 6L90 300mm Heavy-Duty Converter Builds: Breaking Down the Basics

July 27, 2023

Tips for Tackling 8L45, 8L90 Shift Repairs with Sonnax Signal Accumulator Pistons

Caleb Perham

July 26, 2023

GM 9T45, 9T50, 9T60, 9T65 Valve Body Layout

July 25, 2023

Transmission Report Newsletter: August 2023

July 13, 2023

Troubleshooting RFE Overdrive Clutch Failure: Three Key Areas to Check

Caleb Perham

June 22, 2023

4L80-E Performance & Heavy-Duty Transmission Build Guides

June 21, 2023

Ford 10R60, 10R80, 10R90, 10R140 Valve Body Layout

June 02, 2023

Tips for Diagnosing a Ford 6F35 with Codes P073D or P177F

Jim Mobley

May 22, 2023

Transmission Repair Tip: How to Use Small Drill Bits with a Portable Drill Motor

Jim Mobley

May 15, 2023

Positive Sealing: The Benefits of O-Ringed End Plugs

Maura Stafford

May 15, 2023

Understanding Cooler Control Valves: What Thermal vs. Pressure Control Means for Your Build

May 04, 2023

Diagnosing AS68RC Intermittent Pressure Switch/Linear Solenoid Performance Codes

Jim Dial

April 03, 2023

Chrysler ZF8 (Gen. 1 & 2) Identification Guide

Jim Dial

March 31, 2023

GM 9T45/50/60/65 Identification Guide

March 28, 2023

Tips for Troubleshooting Ford 10-Speed ATF Venting & Overheating

Jim Mobley

March 24, 2023

Transmission Report Newsletter: March 2023

March 08, 2023

GM 6L45/50, 6L80/90 No Movement Conditions: Analysis & Repair Tips

Jim Mobley

January 30, 2023

Signal Accumulators & Solenoid Dampers: Their Function & Impact on Drivability Complaints

Maura Stafford

January 25, 2023

Toyota FWD 6-Speed Lockup Strategy

Eric Streed

January 25, 2023

Breaking Down the Basics of Banded Solenoids

Eric Streed

January 25, 2023

Uncovering the Root Cause of Pressure & Complaints – The Critical Role of Solenoid Modulator & AFL Valves

Maura Stafford

January 13, 2023

Ford 10R60/80/90/140, GM 10L60/80/90 (Gen. 1 & 2) & Allison 10L1000 Identification Guide

January 12, 2023

Diagnosing Chrysler Transmission Max Line Pressure & P0933, P0869, P1745 Codes

Jim Mobley

January 05, 2023

How to Identify Allison® LCT 1000 Input Shafts

December 29, 2022

Clutch Control Valves in Later Units vs. Shift Valves in Early — Why Wear is Critical to Detect

December 29, 2022

How to Choose the Right E4OD/4R100 Line Pressure Modulator Plunger Valve Kit

December 29, 2022

Zip Kit FAQ: What's Up with Plugging Separator Plate Ports?

December 29, 2022

Chrysler 68RFE '19-Later Changes & Identification

Jim Dial

December 20, 2022

PTFE Seal Install Tips for Sonnax 2nd Gear Super Hold Servo

Caleb Perham

December 12, 2022

Troubleshooting GM 8L45, 8L90 No Move & No Pressure Conditions

Jim Mobley

December 07, 2022

How to Assemble & Install the TH400 Smart-Tech Drum Module

December 07, 2022

Transmission Report Newsletter: December 2022

December 07, 2022

Stop-Start Accumulators: What You Don't Know CAN Hurt You

Matt Allbert

November 03, 2022

Watch Out for 4R70W Pressure Regulator Valve & Casting Wear

Brian Wing

November 03, 2022

How to Identify 8L90 Input Shafts

October 21, 2022

FAQs About the TH400 Smart-Tech Drum Module

October 13, 2022

Line-to-Lube/Converter: A Balancing Act — PR Valve Position is Key

Maura Stafford

October 13, 2022

How to Get Started with OE ECU Reprogramming

Jim Mobley

September 16, 2022

Troubleshooting Ford 6R80 & 6R140 2-3 Shift Quality Issues

Jim Dial

August 16, 2022

Transmission Report Newsletter: August 2022

August 15, 2022

Troubleshooting Ford 6R80 & 6R140 Timing-Related Shift Issues

Jim Dial

August 02, 2022

GM 8L90 Model Year 2019 S4/23468 Control Valve Changes

July 08, 2022

How to Identify Ford 6R140 Torque Converter Features & Avoid Application Pitfalls

Steve Jaussaud

June 17, 2022

DIY Tool for FAST Sonnax RFE Accumulator Piston Installs

June 16, 2022

Improve TH400 Performance, Consistency & Safety with the Smart-Tech Drum Module

June 06, 2022

Ford 6R140 – Repairing Elusive Intermittent Neutral Condition

Jim Mobley

May 11, 2022

Ford 6R140 Separator Plate Identification – How to Identify Changes & Interchangeability

Eric Streed

April 20, 2022

ZF8HP45/55/70 & Chrysler 845RE Valve Body Identification Guide

April 07, 2022

Transmission Report Newsletter: April 2022

April 06, 2022

Diagnosing the Infamous GM 8L45, 8L90 3-4 Neutral: Check Your Solenoid Wiring Harness Assembly

Jim Mobley

March 29, 2022

Sonnax Thermal Bypass Eliminator Kit Identification Guide

March 28, 2022

Chrysler 948TE Valve Body Layout

March 28, 2022

Aisin Seiki AS66RC, AS69RC Valve Body Layout

March 21, 2022

Aisin Seiki AS66RC, AS69RC Identification Guide

March 15, 2022

6L80 Series Pump Drilling Demo with Small Drill Bit Vise

Jim Mobley

March 07, 2022

Troubleshooting Ford 6F35 Torque Converter One-Way Clutch Failure

Jim Mobley

February 24, 2022

SonnaFlow® Chart: Ford 6F35

February 03, 2022

Troubleshooting Errant Voltage from Chrysler TIPM

Jim Mobley

January 26, 2022

Aisin Seiki AS68RC Valve Body Layout

January 20, 2022

Jatco, Nissan JF016E (RE0F10D) & JF017E (RE0F10E) Valve Body Identification Guide

January 10, 2022

Chrysler 948TE; Honda/Acura, 9-Speed; ZF9HP48 Vacuum Test Guide

January 05, 2022

TH400 Forward Drum & Input Shaft Upgrade Options

December 20, 2021

How to Set Up a Snap-on® Scanner for Dodge Secure Vehicle Gateway™ Protocol

Jim Mobley

November 11, 2021

How to Easily Check Endplays in Chrysler RFE Transmissions

Randall Schroeder

November 09, 2021

Hyundai/Kia A6GF1, A6LF1/2/3, A6MF1/2

November 05, 2021

Transmission Report Newsletter: November 2021

November 05, 2021

Chrysler 62TE Vacuum Test Guide

October 19, 2021

GM 4L60 (700-R4), 4L60-E Accumulator Valve Codes — Deciphering the Alphabet Soup of Shift Feel

Maura Stafford

October 08, 2021

GM 4L60-E, 4L65-E, 4L70-E Valve Body Layout

October 07, 2021

GM 4L60 (700-R4) Valve Body Layout

October 01, 2021

GM 8L45, 8L90 Valve Body Layout

September 29, 2021

See What's Inside the Sonnax 4L80-E Performance Pack

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