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  • Thursday, January 4, 2018 2:48 PM
    There are times on ATSG’s technical help line, when we discover a solution to a problem, we would like to produce a bulletin or a seminar piece to share this information but do not. The reason for this is, although we determined a solution, we can only guess as to why the solution corrects the problem. Here is an example of the type of situation we find ourselves in.
  • Technically Speaking: It Doesn’t Move and I Cannot See Why
    Friday, December 1, 2017 12:01 AM
    A Nissan or Infiniti vehicle using the RE5R05A transmission may come into the shop with a no-move complaint. Or, a unit still under your warranty comes back with a no-move condition. And worse yet, you take it apart and see nothing wrong.
  • Technically Speaking: Connector Blues
    Wednesday, November 1, 2017 12:00 AM
    Wayne Colonna focuses on water contamination of the C134 connector in an FNR5.
  • CVT’s 3-Second-Rule Delay
    Sunday, October 1, 2017 12:00 AM
    Jatco’s CVT2, CVT7 and CVT8 have their own unique way of controlling garage shifts into gear. Although each of these transmissions utilize a torque converter, great lengths went into designing a strategy that would prevent harsh drive or reverse engagements to prevent damage to the variator (primary and secondary pulley assembly).
  • Technically Speaking: Torque Reduction
    Wednesday, September 6, 2017 10:11 AM
    Engine torque reduction is a computer strategy that has been used in vehicles for many years now. When the selector lever is used to place the transmission into reverse or drive from either park or neutral, a command is given to reduce engine torque. This assists in providing a smooth engagement into gear. Likewise, torque reduction is commanded to take place during each upshift for smooth shifting. This strategy can also be used in vehicles equipped with adaptive cruise control or when traction control becomes activated.
  • Technically Speaking: It’s the Little Things
    Monday, August 7, 2017 10:44 AM
    The phrase, “It’s the little things,” is often times pared with “that count” or “will get you.” Both are true when it comes to a loss of reverse after rebuilding a 4F27E. It is easy to overlook the little things that count and it will be the little thing that gets you.
  • Updated 6L80/90 Output Shaft Assembly
    Tuesday, July 11, 2017 3:38 PM
    During model year 2012, Chevrolet and GMC trucks equipped with the 6L80/90 transmission received an updated output-shaft assembly. The previous output-shaft assembly was comprised of a separate output shaft, output carrier ring gear, ring-gear spacer, output carrier internal front gear and snap rings as seen on the left in figures 1 through 3. This required the use of a specific style output transmission speed sensor also shown on the left in figures 4 and 5.
  • Mercedes 722.6: No Upshift Condition
    Wednesday, May 3, 2017 1:53 PM

    Technically Speaking:

    The frustrated owner of a 1996 Mercedes S500 called to complain that his vehicle had been acting up for some time and he was at his wits end. Apparently, he and others had taken a swipe at repairing the problem with little success so the vehicle was towed into the shop to get a look with a fresh pair of eyes, so to speak.

  • Ford TorqShift 6 Component Upgrades
    Wednesday, March 8, 2017 3:50 PM
    The transmission workhorse of the Ford family was developed internally to rival other manufacturer’s heavy-duty gearboxes such as the Allison 1000.
    Unlike the 6R60 / 6R80 models that were a carryover from the ZF6HP26, Ford started with a clean sheet of paper in the development of the 6R140. To say that this unit is a beast would be an understatement due to the fact that it weighs more than 300 pounds.
  • GM 6T30 Six-Speed Automatic – Junior Addition - Part 2
    Monday, February 13, 2017 1:53 PM
    After General Motors and Ford collaborated on the GM 6T70 and Ford 6F50 transmissions, they recognized the need for another transmission to accommodate lighter-duty vehicles.
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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