If you're asking about shifting gears yourself, it's not good for the auto tranny to be doing that like it's a manual transmission.
Now, the gears are listed individually, and are there to be used if needed. But you shouldn't really pretend it's a manual transmission and drive that way all the time.
Mucho Big Bucks have been spent by Toyota, and all of the car makers, to give the very best performance out of an auto transmission, so that you get the best ratio of performance and economy. The individual gears are there if they are needed under SPECIAL circumstances.
Such as driving thru mountains, when going downhill for a long ways, you want to shift into lower gears, so that you don't have to use the brakes much, otherwise, you could actually overuse and overheat and over-destroy the brakes. That's why the 3 and 2 settings of the gears are avalable, especially the 2 setting. 1st gear is used only if you're going to be towing something for a short distance, or even if you need to try and get car out of snow or sand.
I'm not sure about what rpms you should use to shift, because that pretty much depends upon what the redline is for each individual car. A higher redline means that each gear can go higher rpms.
It's easier to find out by speed.
1st gear usually should be shifted around 10-15 mph, and usually tops out at 25.
2nd gear usually can be shifted at 25, and sometimes can go as high as freeway speeds, which is why it is the favorite gear to use when coming down from mtns, because the gear can go faster, yet has the torque available to keep car at lower speeds. But if your car is a 5 spd, the range of 2nd gear in your car may be lessened.
3rd gear will be good from 35 up to freeway speeds of 60-70 mph. But it's obviously best to run freeways at at least 4th gear, which can be shifted into even as low as 40 mph, or 45 mph. 5th gear is best only for constant freeway speeds.
Have you ridden a 10 speed bike? YOu know it's easiest to start peddling when the gears are low, because the pedals move faster, and in shifting as you pick up speed, so that the pedals are still able to be used safely and correctly. It's exactly the same with a car transmission, whether auto or manual.
So if you're thinking of using the single gears as if they were a manual tranny, I"d greatly suggest you NOT to do it. There's lots of extra gears and works inside an auto tranny that's not in a manual, and constantly moving the gears manually will wear the tranny out other than being done automatically. The tranny was built with it to be used automatically. So too bad you couldn't have gotten a standard tranny, but messing around wth the auto tranny like that will also mess up your warranty on your brand new car!!How to use lower gears on the 2009 Toyota Camry LE?It has overdrive and drive is low and then 2 lower and are not meant to be shifted. You can easily tell an abused tranny and may end up with a 3500.00 repair.
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