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Shift Pointers: A 10R140 with a classic drivability complaint

A 2021 F-350 6.7L Super Duty using the 10R140 beast of a transmission recently came into Precision Auto Repair not upshifting when pulling a load only. On light throttle it would upshift, but not as high as tenth gear. Once the throttle was depressed it would downshift and no longer upshift. It displayed similar symptoms

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The powertrain aftermarket: Growing and global

For the past few decades, the powertrain aftermarket, much like OEMs, has come to acknowledge that the marketplace for both supply sources and product sales has expanded past borders to become truly global. Various segments of our industry will have different mixes of global component supply and global sales networks. Nothing exemplified the global dependency

6R80 whirring noise: TCC slip or engine surge?

About a month ago, we at Certified Transmission received a 2015 Ford Expedition 4WD at the shop. It was equipped with a 3.5L Turbo V6 engine and a 6R80 transmission. The complaint read, “RPMs fluctuate up and down and there is a whirring noise.” The vehicle was brought to us by one of our wholesale

The torque converter can of worms: Lockup and aftermarket programming

Lockup torque converters have been around now for some time. They came into production around the time when fuel mileage demands were put into effect by the government, and the auto manufacturers needed to do something to better connect the fluid coupling (torque converter) of the automatic transmission to the motor. By doing this, OEMs

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The Subaru mystery burn

The Subaru TR580 transmission is known for having torque converter clutch solenoid failures. An example of this can be seen in Figures 1 (above) and 2 (below). The solenoid resistance should be between 10 to 13.5 ohms. The resistance right at the solenoid itself on the valve body is close to 38 ohms. And as

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Shift Pointers: Where’s that fluid leak coming from?

A 2016 Honda CRV 2.4L (Figure 1), using a BLJA CVT 4WD transmission (Figure 2) comes in to a shop with a customer complaint of a leak. Before anyone checked fluid levels, the vehicle was hoisted up for a look. A visual inspection revealed a leak coming from between the transmission and the engine. The

Multitasking: Sorting out multiple issues with the same vehicle

While it’s common for a customer to bring us a vehicle with a single, specific complaint, we often find more than one problem when getting into the diagnosis of their original concern. The owner only knows one thing; they want the vehicle to run and operate properly. It’s our responsibility to identify and execute a

Chrysler RH/RE late shifts and high pressure

You may find that these transmissions have a late 1-2 and 2-3 shifts along with high TV/line pressure.

Ford 6R80 shift solenoid ‘E’ resistance change: How to tell the difference

The lower resistance and higher resistance solenoids are not interchangeable.

Allison 1000 geartrain bind-up

When the torque converter housing is bolted to the transmission case in an Allison 1000, the geartrain is locked and will not rotate.

How to get around non-serviceable GM 6T70/75 self-tapping pump screws

General Motors designed the 6T70/75 transmission fluid pump to be a non-serviceable component.

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Shop Profile: AAction Transmissions begins a new era by trying to reach a new generation of customers

AAction Transmissions of Pembroke Pines, Florida (in the Miami area) was founded 43 years ago by Al Petrassi. The shop became one of the largest in the area and acquired a strong reputation over the years. Last year, Al Petrassi decided to retire at the age of 68, and sold the business to Luis Merchan,