It feels as if modern cars are being endowed with ever more gear ratios. It's usually done in a bid to lower emissions – just look at Ford's 10-speed auto 'box, fitted to the Mustang, Ranger and Transit (among others) as an example of this. By offering lots of gear ratios, you eventually get to a stage where you can have exceptionally long ratios to drop engine revs right down when you're cruising, thus reducing emissions.

However, these extra gears take up space in a similar size gearbox casing, which means gearbox temperatures tend to be higher in modern gearboxes than they used to be. This extra thermal strain can lead to extra mechanical wear on gears, which in turn can mean your transmission fluid can be well past its best after 37,000 miles.

I believe that the problem with the gearbox mainly happens because people do not take it seriously and do not immediately pay attention, therefore they exacerbate the problem that can be solved right away. As for me, the most important thing that can be knowledge of your car and how you can change or repair the gearbox, this site https://at-manuals.com/manuals/5r55w-s-n/ helped me a lot, you can familiarize yourself with the information that is here and maybe you will find something that will be of interest to you.

I really want such breakdowns in modern cars to be as few as possible, so that this information is useful only for auto mechanics who earn their money, but unfortunately, not everyone is able to do their job as efficiently as possible.