The more gears a car transmission has, the better it will operate over a wide range of speeds. CVT Transmissions (Continuous Variable Transmission) And automatic car transmission repair or replacement can get very expensive.ģ. While easier to use, automatic transmissions have more complex parts, and therefore, are more prone to failures. A transmission with more gears means a vehicle has a wider range of speeds where it will perform optimally and lead to better overall fuel economy. Most automatic transmissions have between five and ten gears- and the more gears your transmission has, the better it will perform at different speeds. You've probably heard the sound of your engine getting higher, but then the sound drops as you continue to accelerate - that's your car moving from a lower to a higher gear. Once a car is in drive, its computer takes over the transmission, shifting between gears as necessary while the car accelerates and decelerates. This type of transmission automatically changes gears as the vehicle moves, leaving the driver to focus more on the road, rather than shifting the clutch. If a driver doesn't have the time to take on the extra work that comes with driving a stick shift, then they're best suited for choosing to drive an automatic transmission vehicle. ![]() Given the reputation of these gearboxes, maybe the realistic lifetime of the best of them is in the region of half a million miles by which time the wheel bearings, engine, suspension and everything else will also be shot.Yes, manual transmissions are mechanically simpler, but with the caveat of being harder to operate. However, most people would point towards the fact that very very few of these gearboxes fail in the low ambient conditions of this country and so the effort of changing the fluid would be somewhat wasted. My guess is that once the fluid smells burnt, this is indicative of damage to the fluid itself and therefore changing it would be beneficial to enhance the longevity of the system. Of course, if owners of the CT or prius would like to lessen the chances of gearbox failure in the interests of enhanced longevity, then they should change the fluid. ![]() These tiny metal particles will not be doing the electrics or the bearings any good.Īll this does happen within the Lexus gearbox, however, Lexus (and Toyota) take the view that since, in the most part this doesn't lead to gearbox component failure within the first 100,000 miles, it is of no great importance to the reputation of the company or the product. Wearing gears mean that tiny particles of metal are being washed around the gearbox which contains an electrical motor / generator as well as some bearings. ![]() ![]() Gears give oil a hard time in that they physically squash and break up the polymer chains contained within oil (ie the gears wear the oil out) with reduced lubrication properties caused by worn out oil, the gears will wear each other out. The Lexus gearbox has gears and a chain and an electric motor/generator in it. Replacing the fluid will most likely prolong the life of the gearbox simply because new fluid does its job better than old fluid. One could say that about any gearbox or engine but manufacturers prefer not to because the chances of the components consistently outlasting any warranty periods are reduced. So the fluid will stay in the gearbox until the gearbox goes wrong. I am guessing that the term "for life" means for the life of the gearbox.
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