bad to shift from neutral to drive while on a roll?

[OS]

once while driving at freeway speeds, my friend knocked his auto tranny from drive to neutral. While still rolling along at freeway speeds, he tried shifting it back into drive. The gearbox made like a clunk noise and basically broke. Is this a fluke or does that kind of shifting cause damage to trannys?

 

[PsychoAndy]

If its an auto, I cant see a problem. I mean, unless he went from N to d2 at 70 MPH.

-PAB

 

[JC]

Shouldn't have caused a problem. Shifting from neutral to reverse or park, however.....

JC

 

[Evadman]

Then the trans was going out anyway.

Shutting the engine off is bad, as you can flood the exaust with fuel, then when you start it back up, blow the headers off the engine.

As for shifting from neutral to drive and back? no problems. Unless he tried reverse. Even 2d should be fine, as unless the trans is broken, or the computer / valve body is screwed up, it should not let you shift into 2d. Or at least not downshift.

<edit>
it is flat out impossable to shift into park at speed. You will get a grinding noise, or a clacking. but it will not lock the wheels or the trans.

 

[UNCjigga]

Knight Rider never had a problem. See the previous Knight Rider thread here

 

[OS]

Originally posted by: Evadman
Then the trans was going out anyway.

Shutting the engine off is bad, as you can flood the exaust with fuel, then when you start it back up, blow the headers off the engine.

As for shifting from neutral to drive and back? no problems. Unless he tried reverse. Even 2d should be fine, as unless the trans is broken, or the computer / valve body is screwed up, it should not let you shift into 2d. Or at least not downshift.

<edit>
it is flat out impossable to shift into park at speed. You will get a grinding noise, or a clacking. but it will not lock the wheels or the trans.

it was a high mileage car, sentra with 150k miles and it had suffered bad abuse during it's life.

 

[Evadman]

Originally posted by: OuterSquare

Originally posted by: Evadman
Then the trans was going out anyway.

Shutting the engine off is bad, as you can flood the exaust with fuel, then when you start it back up, blow the headers off the engine.

As for shifting from neutral to drive and back? no problems. Unless he tried reverse. Even 2d should be fine, as unless the trans is broken, or the computer / valve body is screwed up, it should not let you shift into 2d. Or at least not downshift.

<edit>
it is flat out impossable to shift into park at speed. You will get a grinding noise, or a clacking. but it will not lock the wheels or the trans.

it was a high mileage car, sentra with 150k miles and it had suffered bad abuse during it's life.

then it was just it's time to go. When you shift like that, the 1st clutch pack probably hit 10k+ RPM. Over it's entended limit, but more than manageable. It just decided to let go. Could have been the carrier too.

 

[OS]

Originally posted by: Evadman


then it was just it's time to go. When you shift like that, the 1st clutch pack probably hit 10k+ RPM. Over it's entended limit, but more than manageable. It just decided to let go. Could have been the carrier too.

yeah he mentioned like how the car once didn't have the oil changed for like 20k miles or something like that. :Q

 

[JC]

It is flat out impossable to shift into park at speed. You will get a grinding noise, or a clacking. but it will not lock the wheels or the trans.

You can shove the lever into the park position. I didn't say it would go into park, just that it's not good

 

[BrunoPuntzJones]

Did it in my Camaro frequently just for the hell of it. Drive to neutral and back into drive. Didn't give me a problem through 100,000 miles or so (although the trans started making funny noises in the later part of it's life).

In a Tahoe was in drive and was dicking around and hit the gear into reverse while going about 35. Car just shut off, no harm done.