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  • TASC Force Tips: Valve Body - Vacuum test locations
    Thursday, January 4, 2018 2:40 PM
  • TASC Force Tips: ‘Yaw’ Making Us Chase Our Tails
    Friday, December 1, 2017 12:01 AM
    A few years ago, I wrote an article about thinking outside the box. Of course, in this case, the “box” is the transmission, and “outside” is ANYTHING else on the vehicle that could affect how the transmission operates (or is perceived to operate). With so many computers sharing data and the OEMs giving us little information as to how the software responds to certain problems, it can easily back us into a corner of confusion. It seems about once a year our shop gets burned chasing our tail over something that should be fairly easy to correct. Here is our latest “tail-chaser.”
  • Solving the 6R80 Leak Mystery
    Wednesday, November 1, 2017 12:00 AM
    Ed Lee shows how he proceeded to find a leak in a 6R80.
  • Solenoid Differences: Ford 6F35 Gen 1 vs. 2
    Sunday, October 1, 2017 12:00 AM
    Looking back on the history of the Ford 6T40, the cousin to the 6F35, we recall a second generation of this transmission coming out in 2012.
  • TASC Force Tips
    Wednesday, September 6, 2017 10:07 AM
    Sonnax submits a vacuum-test layout for the 6R140 valve body.
  • Seal the Deal: Preventing Comebacks with Non-Valve-Body Vacuum Testing
    Monday, August 7, 2017 10:18 AM
    It is widely known that vacuum testing verifies wear levels in valve bores quickly and easily, helping to eliminate guesswork during diagnosis. Because of its effectiveness, vacuum testing has displaced less-reliable test methods to become the industry standard for identifying sources of valve-body leakage. But are there other areas of the transmission — aside from the valve body — that could be tested for leaks using vacuum? Can this kind of testing make life on the bench easier by helping to identify “phantom” leaks that would otherwise result in costly comebacks?
  • Identifying Converter Components
    Monday, July 10, 2017 10:50 AM
    Whether you are searching through a core pile or looking for a specific part to complete a rebuild, sorting out the various identifying features of Ford E4OD, 4R100 and 5R110W converters can drive you crazy. A six-stud version of each converter that happens to have the same K factor (impeller blade angle) will look almost identical. If you have not educated yourself on the subtle contour differences where the impellers mate to the impeller hubs, or cannot recognize the 0.200" difference in the relationship of the pilot to mounting pad difference in the 5R110W compared to the E4OD and 4R100, you can become easily frustrated. The following are part-by-part differences, as well as some hints for identifying each one.
  • CVT Success: In-Vehicle Isolation of Common Problems
    Thursday, March 9, 2017 3:35 PM
    All transmission models have unique problems that are common to that model; Jatco CVT units are no exception. Technicians are facing an uphill battle when it comes to diagnosing and repairing CVTs if they don't have the right information on hand. Knowing what the common issues are and understanding the options available to isolate and fix problems are the keys to CVT success.
  • Understanding 4L80-E Overdrive Clutch Failure
    Monday, February 13, 2017 1:38 PM

    It’s Snow Plowing Season Again!

    Wintertime typically equals a parking lot full of snowplow trucks. Sometimes they represent repeat business — of the bad kind — but most of the time, new work.

  • Identifying Allison 1000/2000/2400 Valve Bodies
    Friday, January 13, 2017 3:20 PM
    Over the years, the Allison® 1000/2000/2400 valve body has had four versions. This article is written to help identify each version. The first two versions are five-speed and the last two are six-speed valve bodies. The information will explain casting number and separator-plate combinations that work correctly together.
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Beyond the missions of providing education and reference materials, Transmission Digest serves as a prime resource used as shops find the parts, supplies and services necessary for successful and profitable operation. Nine of the 12 issues published each year are focused on the products, services and suppliers relating to a specific profit center within the retail shop.

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