Jeff had the oil changed at one of these fast in and out oil change places, and he was very suspicious of the shop and the technician who changed his oil. So I gave him a few things to check on his Jeep, and asked him to let me know what he found. In the mean time I checked my manuals and technical service bulletins looking for something I may have missed. Another problem related to this is the fact that most people do not understand the basic operations of a car, or TV for that matter. So let's look at the automatic transmission basics.
Automatic transmissions work off hydraulic pressure.
You need fluid and pressure, along with a signal of some kind, for the transmission to know when to shift. The transmission fluid is put in through a dipstick tube. There will be a cold fill level and a hot fill level on the dipstick. If the fluid is anywhere between these two marks the fluid is fine. The fluid must also be clean.