On Thu, Oct 2, 2008 at 5:11 PM, Ralph Shumaker <[EMAIL PROTECTED]> wrote:
> Doug wrote:
>> ** Reply to message from "Carl Lowenstein" <[EMAIL PROTECTED]> on Wed, 1 Oct
>> 2008 11:59:08 -0700
>>
>>
>>> Then there was my 1954 Plymouth,
>>> which had the parking brake on the driveshaft.
>>>
>>
>> that is so cool but I've never seen that. But can't one wheel still
>> turn even though the drive shaft is held on some differentials?
>> For some reason I seem to recall having a xmission in park with
>> both rear wheels off the ground when one wheel was rotated the
>> other went in the opposite direction. hmmm, I could be wrong on
>> that though.
>>
>
> That only works with both wheels off the ground.
>
The autmatic transmission in Park has locked the driveshaft. So a
differential being what it is, it keeps the sum of the angular
velocities of the two wheels equal to the angular velocity of its
input. Which is zero. Disregarding differential gear ratio, which
does not matter in the zero case.
carl
--
carl lowenstein marine physical lab u.c. san diego
[EMAIL PROTECTED]
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