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  • Technically Speaking: A Clever Variable Cylinder Management Fix
    Wednesday, August 1, 2018 12:00 AM
    The number of vehicles containing VCM exceeds 4 million to date, as far back as 2005 – Odyssey, Pilot, Ridgeline and Accord – and Acura MDX/RDX/TLX that have an I-VTEC engine. This problem affects many more vehicle owners than you could imagine.
  • Technically Speaking: The Variable Line Pressure Solenoid
    Sunday, July 1, 2018 12:00 AM
    The 41TES and the 42RLE-VLPS are known to produce a “Line Pressure to High” code P0869 due to defective TCM/PCM’s immediately after a 2-3 shift. When this call comes in on our help line, we ask the tech involved to run some tests so we can be certain that a defective computer is the cause. Being a pattern failure, a repair tech can be as costly as buying a computer that doesn’t fix the problem and makes for a bad day.
  • Technically Speaking: Something Amiss with Planetary System
    Friday, June 1, 2018 12:00 AM
    You may remember back in the early days of the 41TE transmission (A604), the sun gear was known to shear off the shell. The result would be no reverse; it would take off in 1st gear but when it shifted into 2nd it would neutralize. With 2nd gear being failsafe, it would default to a neutral gear. The vehicle would then have no movement both forward and reverse. Once the ignition was cycled off to on, you could once again take off in 1st and shift into a no-move condition.
  • 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.
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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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