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Not necessarily a problem Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Mon, 8 Jan 2007 08:15:43 In Reply to: auto transmission question, tsw, Mon, 8 Jan 2007 06:31:18 Members do not see ads below this line. - Help Keep This Site Online - Signup |
There's nothing in a normal automatic transmission to keep you from rolling backwards. Subaru has some hill-holding gadgets, but I think that's for manual trannies.
At idle, the auto tranny is out of gear, but there is some slippage through the torque converter. That's the 'creep' you'll get if you are on a flat surface. On a flat, you take your foot off the gas, and the car may creep forward at a slow speed. Depending on the stall speed designed into the autotranny, the idle speed, and a bunch of other factors, you'll creep faster or slower.
If you are on a hill (nose up, I assume), you may creep forward if you take your foot off the brake. Or you might stay still, or may roll back. If the idle slip of the transmission isn't greater than the gravity pulling the car backwards, you'll roll backwards. That's not a problem with the automatic. That's a function of settings.
Let's put it this way - in general, automatics aren't designed to keep you from rolling backwards on a hill.
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