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  • 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.
  • TASC Force Tips: Valve body - GM Gen. 2 6T70, 6T75, 6T80 - Vacuum testing
    Friday, August 31, 2018 12:00 AM
    Author: Sonnax   
    Subject Matter: Valve body    GM Gen. 2 6T70, 6T75, 6T80   
    Vacuum testing

  • TASC Force Tips: Trading Places
    Wednesday, August 1, 2018 12:00 AM
    Most builders swapping hard parts have learned that mismatching drive components in a transverse unit will result in a host of negative consequences. The wrong ratio sprocket(s) or carrier can result in TCC and ratio codes, along with converter and unit clutch slippage. Unfortunately, optional ratios aren’t exclusive to the final drive; they can exist in the valve body as well.
  • TASC Force Tips: All Over the Map
    Friday, June 1, 2018 12:00 AM
    Burnt 3-4 clutch packs are notoriously common in the GM 4L60/E family of transmissions. Tech hotlines and internet bulletin boards are often jammed-up with people pleading for help with this 3-4 roasting. Some technicians get frustrated and throw multiple Hail Mary replacement parts at the transmission when facing this issue. But it doesn’t have to be an exercise in frustration; burnt 3-4 clutches can be transformed from a dreaded problem into a routine moneymaker.
  • 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?
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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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