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- Location: Whitby. Not THAT Whitby, the other Whitby, the one in Durham. Not THAT Durham, the other Durham.
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1) Leave it in "fully automatic" D4 and put your foot into it. It will kick down and pass.
2) Put it in tiptronic mode and "tip" it into third or second depending on your speed, to pass, then back into 4th... which is what the first option will do.
3) Manually shift it into D3 from "drive" and go back later in a rental car to pick up fragments of your transmission.
In my experience if an automatic transmission does not have a tiptronic/shifttronic gate, they generally do not like to be downshifted on the fly, especially at high speeds like overtaking another car. "Fully automatic" downshifting tends to be really harsh and jarring, regardless of the speed. I'm not saying you can't do it, but it's generally not great for them.
 I meant to finish that statement but I became distracted.. if a tranny doesn't have a shiftable gate, it's not good practice to manually downshift. You can, but it is harsh and I've seen many transmissions ruined because of it. Hills and bad weather are a little different, because chances are you are going slow enough to not damage anything, however trucking along at 100km/h and dropping a gear, even in a manual is jarring, but on an auto which has less gears the ramp up in rpms is that much greater. IF a transmission has a shiftable gate it has been designed to shift on the fly...but more than likely only when the tiptronic function has been triggered... otherwise.. why would they have it? I'm not saying you will 100% ruin the transmission by going from D4 to D3, but when they designed the transmission, they gave it a tiptronic feature for a reason. I'd use it instead. Why not? It's there.
Another thing to consider; Tiptronic has lockouts on lower gears if you are going too fast to safely downshift. Will "fully auto" mode lock you out if you manually select a lower gear outside of the tiptronic gate? I've seen some cars that don't (or don't do an effective job of it) and serious damage occurs.
Last edited by BlackShadow
on Sun Jun 23, 2013 11:53 pm, edited 1 time in total.