TEHCM Archives - Transmission Digest
Integration becomes synergy for Sonnax and Rostra

Klynt Baker, the recently appointed president of Sonnax and Rostra, says that his responsibilities aren’t two aftermarket companies owned by Marmon Holdings. Baker says that Sonnax and Rostra have integrated their operations to the point that there are indeed two brands encompassed in a single business. The Marmon Automotive Aftermarket Group is a subsidiary of

Sonnax introduces remanufactured TEHCMs for 6L80/90

Sonnax has introduced a new line of remanufactured TEHCMs for GM 6L80 and 6L90 transmissions. Each unit is fully electro-hydraulically tested to comply with OE performance and VIN-blanked for easy programming to any applicable vehicle, the company says. Coverage includes the following:

Seeing the Forest AND the Trees

They say that the proverbial phrase “I couldn’t see the forest for the trees” means that a person or organization cannot see the big picture because it focuses too much on the details. I have seen this phrase used after days of diagnosing a transmission problem without resolve, yet the cause is staring you in

Transmission Tech: TEHCM

In this Transmission Tech, learn what separates the 6T40 computer unit from most other transmissions.

Transmissions with Mechatronics – TEHCM: Part II

In addition to dealing with the transmission evolutionary variables mentioned in Part I of the series, the transmission repair industry must contend with much more currently, as well as future changes that will occur.

Despite the efforts of organizations like SAE (Society of Automotive Engineers), the OEM’s have failed to standardize certain aspects of vehicle operations. Several different protocols exist that the OEMs use for OBD-II compliance. For a period of time, there were five basic protocols used by most OEMs to control their vehicles. Today there are a lot of different protocols to control an array of components from powertrain to airbags to audio/visual.

Diagnostics, testing equipment and repair will vary based upon the system, which is why it’s important to know what a particular scanner can accommodate.