Transmission Tech Articles

Sonnax offers a broad range of resources to help technicians stay on top of developments in the automatic transmission industry. Whether you're troubleshooting a problematic valve body or looking for rebuilding tips and tricks from the pros, you'll find no better online resource. Plus, we're always adding new content to keep you and your shop on the cutting edge, so be sure to check back often to see what's new from Sonnax.

Look up specific technical resources by selecting a Make & Unit, or you can search by the article's subject.

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Article Author Date
Transmission Report: Performance Rebuilds & Converters Sonnax 03-2013
Valve Body Bore Preparation Tory Royce 03-2013
Valve Body Qualification Bob Warnke 01-2013
Proper Reamer Care Sonnax 01-2013
Talkin’ ‘Bout My Gen-eration: ZF 6-Speed Differences in Generation 1 & 2 Valve Bodies Maura Stafford 12-2012
Transmission Report: New Sonnax Improvements for the 4L60 3-4 Clutch Sonnax 10-2012
4L60-E: No Move After Rebuild Ed Lee 07-2012
Troubleshooting Lockup Issues Ed Lee 04-2012
Transmission Report: Which Kit is Right for Your Rebuild? Sonnax 03-2012
Reverse Drum Wear: a 4L80-E True Story Randall Schroeder 01-2012
Diagnosing the Elusive NO REVERSE with the 4L80-E Randall Schroeder 01-2012
Front Seal Blow Out After Converter Replacement Marc van Aalderen 12-2011
Know Your Patient: How to Identify Chrysler VLP Models Robert Moreau 12-2011
It Is Never Wrong to Do Right Dan Tucker 10-2011
Transmission Report: Overheating Honda Converters, Vacuum Testing and more Sonnax 10-2011
Overheated Honda Converters/740 Codes Ed Lee 09-2011
Transmission Report: Hitting the Road with the Sonnax Roadshow Sonnax 07-2011
Valve Body and Mechatronic Service: ZF6HP19/26 & Aisin AW TR-60SN/09D Bob Warnke 05-2011
6L80 / 6L90 No Movement After Repair Gregg Nader 04-2011
Don't Get Shook Up Dan Tucker 03-2011
Transmission Report: Line Pressure Booster Kits and more Sonnax 02-2011
What is Metal Fatigue and How Can it be Prevented? Kevin Tower and Bill DeRoche 02-2011
Vacuum Testing for Leakage Sonnax 01-2011
Critical Wear Areas & Vacuum Test Locations: Aisin AW 55-50SN Sonnax 01-2011
Vacuum Test Equipment Set-up Sonnax 01-2011
Aisin AW Linear Solenoids Bob Warnke 01-2011
Manual Valve Confusion Jeff Parlee 10-2010
Transmission Report: SmartShell™ and more Sonnax 10-2010
Cast Iron Powerglide Leaks Ed Lee 09-2010
The Prescription for Optimum Pressure Sonnax 09-2010
Time-tested Techniques for Today's Technology Sonnax 09-2010
Embracing Change Sonnax 09-2010
Not Hard to Keep; Easy to Lose Frank Biolsi 09-2010
A Box, in a CAN Serge Martin 08-2010
SonnaFlow Chart: 4T65-E (Normal) Sonnax 06-2010
Preventing 48RE Transmission Throttle Valve Actuator Codes Jeff Parlee 06-2010
Converter Conundrums Bob Warnke 05-2010
Is It Safe to Drive? Dan Tucker 05-2010
Transmission Report: The Art of Proper Bore Reaming Sonnax 05-2010
SonnaFlow Chart: RE5RO5A (Poor & Normal) Sonnax 05-2010
SonnaFlow Chart: Allison 1000 (Normal) Sonnax 05-2010
SonnaFlow Chart: 5R110W (Normal) Sonnax 05-2010
SonnaFlow Chart: Honda 4 & 5 Speed (Poor & Normal) Sonnax 05-2010
AW55-50 No Reverse & VW 09G No Move Jeff Parlee 04-2010
A Fly on the Wall Gregg Nader 03-2010
TF-60SN Accumulator Body Caution Tory Royce 01-2010
AW 6 Speeds: Valve Body Diagnosis Bob Warnke 01-2010
RE5R05A Facts and Observations Jeff Parlee 12-2009
Thinking Outside the Box Dan Tucker 11-2009
AW 6 Speed FWD Bob Warnke 10-2009
Point of no-return - "Point de non-retour" Serge Martin 10-2009
Easy Fix for 4T60-E Accumulator-Housing Pin Wear Gregg Nader 09-2009
Valve Body Reaming Tory Royce 08-2009
Valve Body Inspection & Reaming for Repair Bob Warnke 07-2009
Little Pieces, Big Problems Serge Martin 07-2009
Mercedes 722.6, Daimler W5, Porsche W5, Jaguar 722.6 Mio Cundl 06-2009
A New Trick in the bag: additional second-gear servo size for the 4L60-E Gregg Nader 05-2009
U151/U250 Solenoid Info Jeff Parlee 04-2009
Transmission versus Cooler Line Dan Tucker 03-2009
5L40E/5L50-E: Isolating Concerns re: Loss of Reverse or TCC Bob Warnke 02-2009
AW55-50SN: Join the Club Bob Warnke 01-2009
Toyota U140/U240 Series Diagnostic Information Jeff Parlee 12-2008
Chrysler RWD Valve Body Linkage Pivot Wear Gregg Nader 11-2008
Troubleshooting the AW55-50SN family Bob Warnke 10-2008
U140E Detailing Bob Warnke 10-2008
AW55-50 / AF23-33: Diagnosis and Valve Body Information Bob Warnke 10-2008
Getting Stumped Dan Tucker 09-2008
Audi A8 Quattro ZF5HP24 TCC Cycling Bang Bob Warnke and Brian Workman 08-2008
AW55-50 Differences between Manufacturers - Part Two Jeff Parlee 07-2008
AW55-50 Differences between Manufacturers - Part One Jeff Parlee 06-2008
An Easier Way to Rebuild Planets Gregg Nader 04-2008
Tips for quality rebuilding Jeff Parlee 03-2008
Adapting to the AW55-50SN valve body Bob Warnke 02-2008
Avoiding after-overhaul problems Jeff Parlee 01-2008
Diagnose with pressure gauges Jeff Parlee 12-2007
Wear in magnesium transfer case housings Gregg Nader 11-2007
Don't be so sensitive Sonnax 10-2007
Figuring Out the 5R55 Alphabet Bob Warnke 09-2007
CalibRATIOn Maura Stafford 09-2007
Food for thought: How hot is hot? John Pifke 09-2007
Conquering the Planets Gregg Nader 09-2007
Deja vu all over again Ed Lee 07-2007
A quick fix for an earlier fix Gregg Nader 06-2007
Make use of those mystery fixes Dan Tucker 05-2007
Follow the Trail of Broken Parts Sonnax 04-2007
Catching a brake on shift problems Ed Lee 04-2007
Making money off the ˜Daily Grind" Rod Cayko 03-2007
TAAT reverse issues Tim LaCerra 02-2007
The Care and Feeding of your GM Sonnax 12-2006
4L60-E flares on 2-3 shift - Now what? Gregg Nader 11-2006
Knowing when to take the EZ Way Sonnax 10-2006
4R44E, 5R55E case-wall movement and comebacks Gregg Nader 09-2006
Put your TCC Circuit to the Test Sonnax 08-2006
When in Doubt, Reset John Pifke 08-2006
Building a Reaming and Inspection Station Seth Baldasero 07-2006
4R100 Repeated Converter Failure Bob Warnke 06-2006
Diagnose with data Sonnax 06-2006
Do Not Let Run-Out Make Problems for your 4L60-E Gregg Nader 05-2006
SonnaFlow Chart: 125-C (Normal) Sonnax 05-2006
SonnaFlow Chart: 200-4R (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: 400 (Normal) Sonnax 05-2006
SonnaFlow Chart: 400 (Poor) Sonnax 05-2006
SonnaFlow Chart: 41TE (604) (Normal) Sonnax 05-2006
SonnaFlow Chart: 41TE (604) (Poor) Sonnax 05-2006
SonnaFlow Chart: 41TE (A604) (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: 41TE (A604) (Normal) Sonnax 05-2006
SonnaFlow Chart: 41TE (A604) (Poor) Sonnax 05-2006
SonnaFlow Chart: 42-47RE (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: 45RFE (Normal) Sonnax 05-2006
SonnaFlow Chart: 46RE (Normal) Sonnax 05-2006
SonnaFlow Chart: 46RE (Poor) Sonnax 05-2006
SonnaFlow Chart: 46RH/RE (Normal) Sonnax 05-2006
SonnaFlow Chart: 46RH/RE (Poor) Sonnax 05-2006
SonnaFlow Chart: 47RE (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: 47RE (Normal) Sonnax 05-2006
SonnaFlow Chart: 47RE (Poor) Sonnax 05-2006
SonnaFlow Chart: 4L30-E (Normal) Sonnax 05-2006
SonnaFlow Chart: 4L60 (700-R4) (Mod) Sonnax 05-2006
SonnaFlow Chart: 4L60 (700-R4) (Poor) Sonnax 05-2006
SonnaFlow Chart: 4L60-E (Normal) Sonnax 05-2006
SonnaFlow Chart: 4L60-E (Poor) Sonnax 05-2006
SonnaFlow Chart: 4L60-E NON-PWM (Normal) Sonnax 05-2006
SonnaFlow Chart: 4L60-E PWM (Normal) Sonnax 05-2006
SonnaFlow Chart: 4L80-E (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: 4L80-E (Normal) Sonnax 05-2006
SonnaFlow Chart: 4L80-E (Poor) Sonnax 05-2006
SonnaFlow Chart: 4R/5R44E (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: 4R/5R44E (Normal) Sonnax 05-2006
SonnaFlow Chart: 4R/5R55E (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: 4R/5R55E (Normal) Sonnax 05-2006
SonnaFlow Chart: 4R100 (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: 4R100 (Normal) Sonnax 05-2006
SonnaFlow Chart: 4R70W (Poor) Sonnax 05-2006
SonnaFlow Chart: 4T60 (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: 4T60-E (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: 4T60-E (Normal) Sonnax 05-2006
SonnaFlow Chart: 4T60-E (Poor) Sonnax 05-2006
SonnaFlow Chart: 5R55N (Normal) Sonnax 05-2006
SonnaFlow Chart: 5R55W (Normal) Sonnax 05-2006
SonnaFlow Chart: 6040LE Suzuki (Normal) Sonnax 05-2006
SonnaFlow Chart: 670 (Normal) Sonnax 05-2006
SonnaFlow Chart: 722.6 Mercedes (Normal) Sonnax 05-2006
SonnaFlow Chart: A340H Jeep (Normal) Sonnax 05-2006
SonnaFlow Chart: A540E (Normal) Sonnax 05-2006
SonnaFlow Chart: A541E (Normal) Sonnax 05-2006
SonnaFlow Chart: Allison 1000 (Normal) Sonnax 05-2006
SonnaFlow Chart: AODE (Normal) Sonnax 05-2006
SonnaFlow Chart: AW4 Jeep (Normal) Sonnax 05-2006
SonnaFlow Chart: AX4N (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: AX4S (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: AXODE (Normal) Sonnax 05-2006
SonnaFlow Chart: AXODE (Poor) Sonnax 05-2006
SonnaFlow Chart: AXODE PWM (Normal) Sonnax 05-2006
SonnaFlow Chart: BAXA Honda (Normal) Sonnax 05-2006
SonnaFlow Chart: C6 (Normal) Sonnax 05-2006
SonnaFlow Chart: CD4E (Normal) Sonnax 05-2006
SonnaFlow Chart: E4OD (Normal) Sonnax 05-2006
SonnaFlow Chart: E4OD (Poor) Sonnax 05-2006
SonnaFlow Chart: F4A33 (Normal) Sonnax 05-2006
SonnaFlow Chart: G4A-EL Ford (Poor) Sonnax 05-2006
SonnaFlow Chart: General (Normal) Sonnax 05-2006
SonnaFlow Chart: General (Poor) Sonnax 05-2006
SonnaFlow Chart: GF4A-EL Mazda (Normal) Sonnax 05-2006
SonnaFlow Chart: KM 175.5 (Normal & Poor) Sonnax 05-2006
SonnaFlow Chart: KM 175.5 (Poor) Sonnax 05-2006
SonnaFlow Chart: MPZA Honda (Normal) Sonnax 05-2006
SonnaFlow Chart: PX4B Honda (Normal) Sonnax 05-2006
SonnaFlow Chart: RE4F04A Nissan (Normal) Sonnax 05-2006
SonnaFlow Chart: RE4F04A Nissan (Poor) Sonnax 05-2006
SonnaFlow Chart: RE4R01A (Normal) Sonnax 05-2006
SonnaFlow Chart: Saturn TAAT (Normal) Sonnax 05-2006
Sonnaflow Chart: 5L40E (Normal) Sonnax 05-2006
Different Strokes for Different Volks Sonnax 04-2006
A Fix for 5R55W Front Planet Bearing Failure Ed Lee 04-2006
The FIX is In Sonnax 02-2006
RL4F02A/RE4F02A Mysterious Axle Seal Leak Ed Lee 01-2006
46-47RH/RE Cooler and Converter Flow Bob Warnke 12-2005
ZF tips with a European flavor Rene Van Vlerken 12-2005
4T65-E All Wheel Drive Problems Noise and Gear Failures Ed Lee 11-2005
Reprogramming our Procedures Gregg Nader 10-2005
Troubleshooting Tips for the 4R44E & 5R55E Bob Warnke 09-2005
Look Before You Leap (into a CD4E) Frank Biolsi 09-2005
GM TCC Circuits Maura Stafford 09-2005
Troubleshooting the 4T65-E: A Matter of Interpretation Bob Warnke 09-2005
Making Sense of Your Saturn TAAT Body Frank Biolsi 09-2005
Let the pressure get to you Sonnax 09-2005
Troubleshooting Converters has Twists and Turns Ed Lee 09-2005
Tranny Terms from A to Z Frank Biolsi 09-2005
A Universal Solution for Reaming Valve Bodies Scott Jackson 09-2005
Reaming Instructions: VB-FIX not required Sonnax 09-2005
Reaming Instructions: if VB-FIX required Sonnax 09-2005
Reaming Instructions: if VB-FIX required (visual) Sonnax 09-2005
Reaming Instructions: VB-FIX not required (drill jig) Sonnax 09-2005
Anatomy of a Transmission:
Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits 		Gregg Nader 09-2005
Mercedes 722.3 Quickie Stator Repair Ed Lee 08-2005
12-Valve Cummins Diesel/618 Transmission: No O.D. Ed Lee 07-2005
GM's Steady State Adapts Dan Tucker 06-2005
So many choices, so many valves Sonnax 06-2005
Playing TAPS on Pressure Systems Dan Tucker 05-2005
Mother knows best (about your CD4E) Sonnax 03-2005
Water, water everywhere: Fix and Prevent Water Damage Wayne Russell 03-2005
Valve Body Training DVD Bob Warnke 03-2005
Chrysler 41TE & 42LE Range Sensors Mike Steen 02-2005
AFL and AFL Frank Biolsi 01-2005
Tools that money can't buy and they pay you to use. Bob Warnke 12-2004
The Cure for the Common (Chrysler RWD) Cold Sonnax 11-2004
4L30-E Slips in 2nd or Slips in 3rd Ed Lee 11-2004
A4LD /4R44E Ford 4.0L Crank Spacer Puzzle Gregg Nader 10-2004
Subarus Have Their Own Set of Problems Ed Lee 09-2004
Good Vibrations, 4T60-E Differential Problems Gary Carne 08-2004
No Lockup for No Reason? Dan Tucker 07-2004
E4OD and 4R100 Work Hard Play Harder Sonnax 06-2004
4T65-Es and the Mysterious Code P0730 Ed Lee 06-2004
Mistaken Identity: Jatco 5-Speed FWD Band Anchor Issues Ed Lee 05-2004
The Hows and Whys of W.A.T. Sonnax 05-2004
Diagnostic Dilemnas Brian Workman 04-2004
AX4S and AX4N Turbine Speed Sensors Mike Steen 03-2004
GM Boost Valves: problems and solutions Sonnax 03-2004
Repeat Catastrophic Lube-Related Failures Ed Lee 02-2004
Don't Bypass other TCC concerns Sonnax 02-2004
Checking Valve Bodies with a Homemade Hydraulic Test Stand Rick Hoffman 01-2004
Take Complete Control with TCC Fixes Sonnax 01-2004
Speed Bumps in TCC Diagnosis: 4T65-E, 46/47RH/RE Bob Warnke 09-2003
Ford Bypass Converter Clutch Circuits Gregg Nader 09-2003
CD4E Proceed with Caution Bob Warnke 09-2003
Beyond 1870: GM Converter Codes P0741, P0742 and 1887 Gregg Nader 09-2003
Valve Body Inspection and Rebuilding Bob Warnke 09-2003
Hardcoat Anodizing: Facts and Misconceptions Maura Stafford 09-2003
Restoring the Valve Bore: Reamer Techniques Maura Stafford 09-2003

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