Articles by Wayne Colonna

There are plenty of times when those seemingly “easier” calls come in and end up being a “lunch eater.” These problems may arise due to maintenance not being in the owner’s vocabulary. Or, when previous work was performed with incorrect parts, or a non-sophisticated operational system is not completely understood.
Let's take a look at how the solenoids interact with the hydraulics to achieve a specific gear. We'll also provide an example of diagnostics should a problem develop.
In this Powertrain Pro section, we have written several articles about the NAG 1 five-speed automatic transmission used in Dodge, Chrysler and Jeep vehicles. This article will continue with some additional issues that may show up in your shop.
The quality of the filter, pump and related seals are critical to the proper operation of the transmission and its length of life.
Ford and GM must have enjoyed the experience as they have joined together again to develop an all-new generation of advanced 9- and 10-speed transmissions for cars, crossovers, SUVs and trucks. They expect to go to production in 2016 for some of their 2017 model year vehicles.
Hyundai and Kia manufacturers use a front-wheel drive 6-speed transmission in many of their vehicles.
In diagnosing problems with vehicles, evey now and then what one thinks they know blinds them from seeing what is really causing the problem. When this occurs, it typically takes place with a vehicle known for a common failure.  
From 1989 to 2015, from a four-speed to a nine-speed transmission, it is interesting to see how through the years Chrysler adapted their shift adaptations.