Posted by NCWayne on November 28, 2011 at 18:06:05 from (69.40.232.132):
In Reply to: Automatic transmission posted by ridgelane on November 28, 2011 at 15:28:54:
The only thing no one has mentioned yet is the torque converter. While it might not really hurt the transmission, per se, to do so, you can downshift all you want, but if the torque converter isn't in lock up then the slowdown capabilities are going to be nothing or next to nothing. This because the tires aren't going to be directly connected to the engine due to the two turbines in the converter spinning seperately, not connected/locked up together. When the converter locks up, or if it lockes up, is dependent on the mfg so there's no hard and fast rule as to what vehicle, speed, etc, etc it's going to happen in. In other words try the whole downshift thing unloaded, in an area where you really don't need it, to make sure it's going to work when you do.
Like others have said though the clutch packs in an automatic transmission are going to have a 'life expectancy' of x number of shifts, be they up or down, unlike a manual transmission. In other words it's just like another post suggested by downshifting manually your putting an extra load on the clutches and as a result are going to shorten their life expectancy at least some. Ultimately your putting extra wear and tear on an expensive transmission to save a 'cheap' set of brakes.
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