Car moves forward when you put transmission into park - MustangForums.com



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Old 05-02-2011, 12:29 PM   #1
Toms_2003_Stang
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Default Car moves forward when you put transmission into park

Whenever you put my g/f's GT into park it moves a little forwards then stops.....is this normal with the 5spd auto?
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Old 05-02-2011, 03:36 PM   #2
hawkeye18
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It is normal with EVERY auto.

When you put it in park, there is a little latch (it's actually technically a pawl) that extends into a gear, which has a certain number of teeth. That pawl engaging one of the teeth in the transmission is what sets the park - the pawl is mated to the case, the gear on the output shaft.

If, when you shift into park, the pawl is not exactly lined up with one of the teeth, the car will roll forward (or backward) until the pawl engages a tooth on the gear. This is why sometimes it will roll forward an inch, sometimes 5-6 inches.

It's certainly nothing to be worried about - that transmission simply happens to have fewer teeth on its parking pawl gear than others, which means the car will roll more than others until it finds a valley between teeth.

Keep in mind also that when parked on a hill, this pawl is the only thing keeping the car from moving; the entire weight of the car is on that pawl. The greater the incline, the more weight on the pawl. This is why sometimes it can be difficult to shift out of park on a hill. This is also why you are supposed to set the parking brake when parking on a hill, to keep the weight off that pawl (which will snap, and that's an expensive fix!).

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Old 05-02-2011, 04:44 PM   #3
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Thank you for responding Hawkeye....
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Old 05-02-2011, 04:50 PM   #4
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Yes, it's normal and I would recommend using the parking brake as well. Less wear on the gear teeth and less likely to "let go"

Last edited by Derf00; 05-02-2011 at 04:55 PM.
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Old 05-02-2011, 08:21 PM   #5
Toms_2003_Stang
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Only time we use the parking brake is when we park her on a hill......
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Old 05-03-2011, 12:21 PM   #6
Mishri
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yep, that is what is recommended, only on inclines/declines, not on flat surfaces... i'm not sure why they say that, but i follow that as well.
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Old 05-03-2011, 12:46 PM   #7
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Normal and most pronounced when on a hill. Anything more than about 6"-12" of movement would be a problem, IMO.
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Old 05-05-2011, 09:14 AM   #8
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Also a good reason why not to park too close to the curb. The lurch is minimal but you never know..
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