automatic transmision, shifting while car in motion ?

a friend (who happens to drive a stick) was driving my Highlander ( w/AT={P
R N D 3 2 L}) , shifted the shifter forward from (D)rive maybe up through
into (R)everse and then back down into Drive while car was moving/coasting
at about 10-15 Mph

the car was coasting (not accelerating) as it was about to come to a stop

I did not feel any jerking or bucking or notice any abrupt movement or
clunkinging or any wierd sound from the Highlander when this shift was
performed ?


Ques :
Is there any chance that the tranny was harmed/affected by this type of
shift ?
What kind of problem might i look/listen/feel/test for ?


Related Ques:
When shifting from Reverse into Drive is it considered good practice to make
car come to complete STOP
before shifting nto Drive ?

-or- can one shift from Reverse to Drive while car is rolling backwards
(without harming tranny)?

Tia or any useful help
robb

"Rob B" <RobB@where.on.net> wrote in message
news:%axjf.7598$N45.2269@newsread1.news.atl.earthlink.net...
[color=blue]
> Ques :
> Is there any chance that the tranny was harmed/affected by this type of
> shift ?
> What kind of problem might i look/listen/feel/test for ?[/color]

****While not recommended, an accidental shift into Reverse like this
normally
does not cause a problem.

[color=blue]
> Related Ques:
> When shifting from Reverse into Drive is it considered good practice to[/color]
make[color=blue]
> car come to complete STOP
> before shifting nto Drive ?[/color]

****You are putting an abrupt load change on the axles, CV joints, etc when
you
bounce from Reverse to Drive without coming to a complete halt. It is like
anything
else you abuse mechanically...you may get away with it for a long time, but
you are
likely to experience failure moreso than a person who drives gently.

Rob B wrote:[color=blue]
> a friend (who happens to drive a stick) was driving my Highlander ( w/AT={P
> R N D 3 2 L}) , shifted the shifter forward from (D)rive maybe up through
> into (R)everse and then back down into Drive while car was moving/coasting
> at about 10-15 Mph
>
> the car was coasting (not accelerating) as it was about to come to a stop
>
> I did not feel any jerking or bucking or notice any abrupt movement or
> clunkinging or any wierd sound from the Highlander when this shift was
> performed ?
>
>
> Ques :
> Is there any chance that the tranny was harmed/affected by this type of
> shift ?
> What kind of problem might i look/listen/feel/test for ?
>
>
> Related Ques:
> When shifting from Reverse into Drive is it considered good practice to make
> car come to complete STOP
> before shifting nto Drive ?
>
> -or- can one shift from Reverse to Drive while car is rolling backwards
> (without harming tranny)?
>
> Tia or any useful help
> robb[/color]

If you didn't feel anything there is probably no consequence to it. He
may have moved the lever so fast that it never even tried to go to
reverse. And if it did, apparently you were rolling fast enough that
the transmission locked it out of reverse. Next time you use your
friend's car, feather the clutch a bit.

"Rob B" <RobB@where.on.net> wrote in message
news:%axjf.7598$N45.2269@newsread1.news.atl.earthlink.net...[color=blue]
>
> a friend (who happens to drive a stick) was driving my Highlander (
> w/AT={P
> R N D 3 2 L}) , shifted the shifter forward from (D)rive maybe up through
> into (R)everse and then back down into Drive while car was moving/coasting
> at about 10-15 Mph
>
> the car was coasting (not accelerating) as it was about to come to a stop
>
> I did not feel any jerking or bucking or notice any abrupt movement or
> clunkinging or any wierd sound from the Highlander when this shift was
> performed ?
>
>
> Ques :
> Is there any chance that the tranny was harmed/affected by this type of
> shift ?[/color]

Since you have an electronically controlled transmission, probably not.
That said, doing stuff like that is not very kind to the transmission and
drivetrain.
[color=blue]
> What kind of problem might i look/listen/feel/test for ?
>[/color]

If you have a problem, it will show up 60,000 or 70,000 miles from now due
to premature wear.
[color=blue]
>
> Related Ques:
> When shifting from Reverse into Drive is it considered good practice to
> make
> car come to complete STOP
> before shifting nto Drive ?[/color]

Absoultely!
[color=blue]
>
> -or- can one shift from Reverse to Drive while car is rolling backwards
> (without harming tranny)?
>
> Tia or any useful help
> robb
>[/color]
Shifting from reverse to drive and vice versa while the vehicle is rolling
puts premature wear on the friction surfaces in the transmission. Instead
of lasting 200,000 + miles, it may only last 100,000 miles.
--
Ray O
correct the return address punctuation to reply

[email]HLS@nospam.nix[/email] wrote:[color=blue]
> "Rob B" <RobB@where.on.net> wrote in message
> news:%axjf.7598$N45.2269@newsread1.news.atl.earthlink.net...
>[color=green]
>> Ques :
>> Is there any chance that the tranny was harmed/affected by this type of
>> shift ?
>> What kind of problem might i look/listen/feel/test for ?[/color]
>
> ****While not recommended, an accidental shift into Reverse like this
> normally
> does not cause a problem.[/color]

Unless you are 17 years old driving the family Motorhome on a cross
country trip and it locks up the transmission. Thereby spending a
wonderfull two days in some small town in the middle of no where. Dad
was a good guy, only told me not to do that again :)

Rob B wrote:
[color=blue]
> Ques :
> Is there any chance that the tranny was harmed/affected by this type of
> shift ?
> What kind of problem might i look/listen/feel/test for ?[/color]

10 mph is pretty fast- you'd have FELT it (but good!) if the trans had
actually engaged. My guess is that the electronics didn't allow it.[color=blue]
>
> Related Ques:
> When shifting from Reverse into Drive is it considered good practice to make
> car come to complete STOP
> before shifting nto Drive ?[/color]

That depends on the transmission design, so *in general* I'd have to say
its a good practice. That said, I rarely do. I just shift while gently
rolling, because none of my transmissions are bothered by doing so (some
transmissions utilize an overrunning clutch in low gear that would be
damaged by being forced the "wrong way." )

"Al Bundy" <MSfortune@mcpmail.com> wrote in message
news:1133446972.011490.285020@o13g2000cwo.googlegroups.com...[color=blue]
>[color=green]
>>
>> Related Ques:
>> When shifting from Reverse into Drive is it considered good practice to
>> make
>> car come to complete STOP
>> before shifting nto Drive ?
>>
>> -or- can one shift from Reverse to Drive while car is rolling backwards
>> (without harming tranny)?
>>
>> Tia or any useful help
>> robb[/color]
>
> If you didn't feel anything there is probably no consequence to it. He
> may have moved the lever so fast that it never even tried to go to
> reverse. And if it did, apparently you were rolling fast enough that
> the transmission locked it out of reverse. Next time you use your
> friend's car, feather the clutch a bit.
>[/color]

Um, what're ya sayin' Ray? payback is a bitch?

"Hachiroku" <Trueno@ae86.GTS> wrote in message
news:0qHjf.415$N%1.271@trndny07...[color=blue]
>
> "Al Bundy" <MSfortune@mcpmail.com> wrote in message
> news:1133446972.011490.285020@o13g2000cwo.googlegroups.com...[color=green]
>>[/color][/color]
<snipped>[color=blue]
>[color=green]
>> If you didn't feel anything there is probably no consequence to it. He
>> may have moved the lever so fast that it never even tried to go to
>> reverse. And if it did, apparently you were rolling fast enough that
>> the transmission locked it out of reverse. Next time you use your
>> friend's car, feather the clutch a bit.
>>[/color]
>
> Um, what're ya sayin' Ray? payback is a bitch?[/color]

I'm not the one who posted that, but I like the idea! Another possibility
is to demonstrate how to shift a manual transmission without the clutch.
--
Ray O
correct the return address punctuation to reply

On Thu, 1 Dec 2005 13:19:04 -0600, "Ray O"
<rokigawa@tristarassociatesDOT.com> wrote:
[color=blue]
>
>"Hachiroku" <Trueno@ae86.GTS> wrote in message
>news:0qHjf.415$N%1.271@trndny07...[color=green]
>>
>> "Al Bundy" <MSfortune@mcpmail.com> wrote in message
>> news:1133446972.011490.285020@o13g2000cwo.googlegroups.com...[color=darkred]
>>>[/color][/color]
><snipped>[color=green]
>>[color=darkred]
>>> If you didn't feel anything there is probably no consequence to it. He
>>> may have moved the lever so fast that it never even tried to go to
>>> reverse. And if it did, apparently you were rolling fast enough that
>>> the transmission locked it out of reverse. Next time you use your
>>> friend's car, feather the clutch a bit.
>>>[/color]
>>
>> Um, what're ya sayin' Ray? payback is a bitch?[/color]
>
>I'm not the one who posted that, but I like the idea! Another possibility
>is to demonstrate how to shift a manual transmission without the clutch.[/color]

It can be done, if you match the revs....... but why do that? The
more RPMS when you attempt a clutchless shift, the better, right?

<e,EG>

-LMB

"Louis M. Brown" <phyphor@rocketmail.com> wrote in message
news:e53vo15c91t88npguvfjsedsb4pukarel9@4ax.com...[color=blue]
> On Thu, 1 Dec 2005 13:19:04 -0600, "Ray O"
> <rokigawa@tristarassociatesDOT.com> wrote:
>[color=green]
>>
>>"Hachiroku" <Trueno@ae86.GTS> wrote in message
>>news:0qHjf.415$N%1.271@trndny07...[color=darkred]
>>>
>>> "Al Bundy" <MSfortune@mcpmail.com> wrote in message
>>> news:1133446972.011490.285020@o13g2000cwo.googlegroups.com...
>>>>[/color]
>><snipped>[color=darkred]
>>>
>>>> If you didn't feel anything there is probably no consequence to it. He
>>>> may have moved the lever so fast that it never even tried to go to
>>>> reverse. And if it did, apparently you were rolling fast enough that
>>>> the transmission locked it out of reverse. Next time you use your
>>>> friend's car, feather the clutch a bit.
>>>>
>>>
>>> Um, what're ya sayin' Ray? payback is a bitch?[/color]
>>
>>I'm not the one who posted that, but I like the idea! Another possibility
>>is to demonstrate how to shift a manual transmission without the clutch.[/color]
>
> It can be done, if you match the revs....... but why do that? The
> more RPMS when you attempt a clutchless shift, the better, right?
>
> <e,EG>
>
> -LMB
>[/color]

I think payback should be roughly equal. You can shift a manual
transmission without using the clutch but many people do not know that so
you can scare the taillights out of them without actually doing any harm,
just like they did when they shifted your transmission to reverse.
Feathering the clutch would actually do more damage than a clutchless shift.
--
Ray O
correct the return address punctuation to reply

On Thu, 1 Dec 2005 18:18:30 -0600, "Ray O"
<rokigawa@tristarassociatesDOT.com> wrote:
[color=blue]
>
>"Louis M. Brown" <phyphor@rocketmail.com> wrote in message
>news:e53vo15c91t88npguvfjsedsb4pukarel9@4ax.com...[color=green]
>> On Thu, 1 Dec 2005 13:19:04 -0600, "Ray O"
>> <rokigawa@tristarassociatesDOT.com> wrote:
>>[color=darkred]
>>>
>>>"Hachiroku" <Trueno@ae86.GTS> wrote in message
>>>news:0qHjf.415$N%1.271@trndny07...
>>>>
>>>> "Al Bundy" <MSfortune@mcpmail.com> wrote in message
>>>> news:1133446972.011490.285020@o13g2000cwo.googlegroups.com...
>>>>>
>>><snipped>
>>>>
>>>>> If you didn't feel anything there is probably no consequence to it. He
>>>>> may have moved the lever so fast that it never even tried to go to
>>>>> reverse. And if it did, apparently you were rolling fast enough that
>>>>> the transmission locked it out of reverse. Next time you use your
>>>>> friend's car, feather the clutch a bit.
>>>>>
>>>>
>>>> Um, what're ya sayin' Ray? payback is a bitch?
>>>
>>>I'm not the one who posted that, but I like the idea! Another possibility
>>>is to demonstrate how to shift a manual transmission without the clutch.[/color]
>>
>> It can be done, if you match the revs....... but why do that? The
>> more RPMS when you attempt a clutchless shift, the better, right?
>>
>> <e,EG>
>>
>> -LMB
>>[/color]
>
>I think payback should be roughly equal. You can shift a manual
>transmission without using the clutch but many people do not know that so
>you can scare the taillights out of them without actually doing any harm,
>just like they did when they shifted your transmission to reverse.
>Feathering the clutch would actually do more damage than a clutchless shift.[/color]

I know, but if you don't match the RPMs properly, then you grind the
living shit out of the dogs teeth, and THAT would make a lot more
noise... (but not TOO much damage)

-LMB

On Thu, 01 Dec 2005 13:19:04 -0600, Ray O wrote:
[color=blue]
>
> "Hachiroku" <Trueno@ae86.GTS> wrote in message
> news:0qHjf.415$N%1.271@trndny07...[color=green]
>>
>> "Al Bundy" <MSfortune@mcpmail.com> wrote in message
>> news:1133446972.011490.285020@o13g2000cwo.googlegroups.com...[color=darkred]
>>>[/color][/color]
> <snipped>[color=green]
>>[color=darkred]
>>> If you didn't feel anything there is probably no consequence to it. He
>>> may have moved the lever so fast that it never even tried to go to
>>> reverse. And if it did, apparently you were rolling fast enough that
>>> the transmission locked it out of reverse. Next time you use your
>>> friend's car, feather the clutch a bit.
>>>[/color]
>>
>> Um, what're ya sayin' Ray? payback is a bitch?[/color]
>
> I'm not the one who posted that, but I like the idea! Another possibility
> is to demonstrate how to shift a manual transmission without the clutch.[/color]

I realized that right when I clicked Send. Yeah, there have been times on
3 Yotas where the Master has given out and I've had to hit the syncros
myself!

--
I've spent a great deal of money on Whiskey, Women and Fast Cars

The rest I've squandered.

"Rob B" <RobB@where.on.net> wrote in message
news:%axjf.7598$N45.2269@newsread1.news.atl.earthlink.net...

Thanks to all responses and i was a little relieved

*BUT*

I may have spoken to soon, it seems that the shifting is more clunky than
prior to shift incidence.

by clunky i mean when shifting from Park to Rev at rest, it seems that there
is more clunking surging as tranny engages, and the same for Rev to Drive,
the tach shows idle below 1000 (est 750 -800) so i don't think it is a high
idle issue.

Plus there is some odd shifting behavior at low speed start / stop

at Starting there seems to be a bit of LAG before picks up
when Stopping the car (sometimes) surges/lunges a bit just before car comes
to a stop

Lunge mostly occurs under condition of driving along 45 mph then
stop/decelerate rather quickly and then at about 5 mph a small hiccup/lunge.

Anyway if you have any advice on this

Help appreciated.

Thanks again to all that responded
robb

"Rob B" <RobB@where.on.net> wrote in message
news:Hl7kf.8959$wf.7395@newsread3.news.atl.earthlink.net...[color=blue]
>
> "Rob B" <RobB@where.on.net> wrote in message
> news:%axjf.7598$N45.2269@newsread1.news.atl.earthlink.net...
>
> Thanks to all responses and i was a little relieved
>
> *BUT*
>
> I may have spoken to soon, it seems that the shifting is more clunky than
> prior to shift incidence.
>
> by clunky i mean when shifting from Park to Rev at rest, it seems that
> there
> is more clunking surging as tranny engages, and the same for Rev to Drive,
> the tach shows idle below 1000 (est 750 -800) so i don't think it is a
> high
> idle issue.
>
> Plus there is some odd shifting behavior at low speed start / stop
>
> at Starting there seems to be a bit of LAG before picks up
> when Stopping the car (sometimes) surges/lunges a bit just before car
> comes
> to a stop
>
> Lunge mostly occurs under condition of driving along 45 mph then
> stop/decelerate rather quickly and then at about 5 mph a small
> hiccup/lunge.
>
> Anyway if you have any advice on this
>
> Help appreciated.
>
> Thanks again to all that responded
> robb
>[/color]
Sounds like something is slipping. I would get the transmission fluid
changed, keeping an eye out for metal particles or friction material in the
drained fluid.
--
Ray O
correct the return address punctuation to reply