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  • Ford 6R140 - Valve Body Identification Guide
    Thursday, August 1, 2019 12:00 AM

    The Ford 6R140 valve bodies can be difficult to distinguish between the early- middle- and late-styles if you don’t know what to look for. Spotting the differences in the cast-ing numbers, separator plates and the cooler bypass valve is critical to proper identification.

  • TASC Force Tips: Converter Clutch Control Part 2
    Friday, May 31, 2019 12:00 AM
    Bob Warnke follows up his discussion of converter clutch control from the April issue.
  • TASC Force Tips: GM Gen. 2 6T70, 6T75 and 6T80
    Wednesday, May 1, 2019 12:00 AM

    GM Gen. 2 6T70, 6T75, 6T80

    Critical Wear Areas & Vacuum Test Locations

  • Hydraulics Fundamentals: Converter Clutch Control Part 1
    Monday, April 1, 2019 12:00 AM
    An understanding of hydraulics is essential for properly diagnosing and repairing transmission problems. This is part one of a two-part article on how an understanding of converter clutch control aids in transmission diagnostics. Part one describes fluid path and torque converter terminology. Part two addresses the valves that control those circuits and the clutch control.
  • Hydraulics Fundamentals: Secondary Regulators
    Friday, March 1, 2019 12:00 AM
    Jim Dial discusses the importance of understanding hydraulics when working with transmissions.
  • Hydraulics Fundamentals: Accumulators & Shift Feel
    Friday, February 1, 2019 12:00 AM
    “Thuds,” “clunks,” “bangs,” “slipping” and “harsh” are all common words used by customers to describe unpleasant shift feel. These complaints can be on upshifts, downshifts, specific gear ranges or on all shifts. Accumulators and their circuits have been used for years as the primary method for controlling shift feel. These components are designed to modify a shift by essentially acting as a shock absorber for the fluid pressure that is applying a clutch, brake or band. Cushioning of this high pressure allows the apply component to engage gradually, instead of slamming on and rattling parts and bones alike.
  • Hydraulics Fundamentals: Main pressure regulator valve lineups
    Wednesday, January 2, 2019 4:14 PM
    As today’s transmissions continue to increase in complexity, from growing involvement in electronic controls to a seemingly exponential increase of available gear ratios, one concept remains the backbone of automatic transmissions: hydraulics. Forces, pressures and flow rates are critical considerations in all stages of a transmission’s lifecycle. Engineers use these as tools to achieve desired shift timing, shift quality and overall efficiency.
  • TASC Force Tips: Friendly Rivalry Builds Success
    Saturday, December 1, 2018 12:00 AM
    Competition and rivalry have been instrumental to technological development throughout the history of motor vehicles. Car manufacturers are always trying to one-up their competitors, whether it be with greater fuel efficiency, speed, interior features, etc. These advances are then made available to the consumer – at a cost. Keeping this cost to a minimum is the most challenging aspect of development; after all, engineering, building prototypes, testing and re-tooling are all very costly. But what if two companies could pool resources and split the savings?
  • TASC Force Tips: ZF8HP55 transmission
    Thursday, November 1, 2018 12:00 AM
    Sonnax has a set of vacuum diagrams for the ZF8HP55 transmission.
  • TASC Force Tips: Another Day at the Orifice
    Monday, October 1, 2018 12:00 AM
    Modifying orifice size in valve body separator plates has been practiced as long as automatic transmissions have been in existence. From performance upgrades to attempting to fix problems caused by valve-body wear, opening up orifices can provide positive effects – but can just as easily cause unforeseen problems. To avoid unwanted results, it is necessary to know when to drill, what size to drill to and when not to drill.
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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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