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Unread 02-15-2009, 06:29 PM   #1
MichelleStarr
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Does coasting hurt an automatic transmission?

I have a 2008 JK with an automatic transmission. Would it be a bad thing to put it into neutral to coast to a stop sign?

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Unread 02-15-2009, 06:35 PM   #2
That1guy
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I wouldnt do it.
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Unread 02-15-2009, 06:37 PM   #3
faticone
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no need to do it, the gas you will save is so minimal its not worth the wear on the auto.
just take your foot off the gas and coast in drive.
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Unread 02-15-2009, 06:50 PM   #4
Warlord2
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I had a judge tell me its illegal to coast in neutral (with a standard you cannot even press the clutch in) while going down a hilll.
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Unread 02-16-2009, 11:52 AM   #5
Grims
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Quote:
Originally Posted by Warlord2 View Post
I had a judge tell me its illegal to coast in neutral (with a standard you cannot even press the clutch in) while going down a hilll.
Yeah, in some states that's the law....crazy.
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Unread 02-16-2009, 11:54 AM   #6
MichelleStarr
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So . . . . . nobody actually knows?
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Unread 02-16-2009, 11:57 AM   #7
kramer8
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No, it doesnt hurt it. Where i live, the streets are so icy that I have no choice at times. I have been doing it for years as others do too, that i have yet to ever have a problem. Just make sure you dont throw it back into gear when your revs arent matched up.
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Unread 02-16-2009, 11:58 AM   #8
Budro
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Quote:
Originally Posted by Grims View Post
Yeah, in some states that's the law....crazy.

*just wondering how the law could ever be enforced..

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Unread 02-16-2009, 11:59 AM   #9
gpb
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Originally Posted by Grims View Post
Yeah, in some states that's the law....crazy.
Not really that crazy once you've seen the results of a runaway 18-wheeler come down a long hill into town and have no way of stopping.

Used to happen every few years where I used to live; some newbie trucker didn't believe the signs at the top of the hill that said put it in low gear. By the time their brakes heat-faded into uselessness it was too late.
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Unread 02-16-2009, 08:10 PM   #10
tricked919
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I used to make the drive from Asheville to Johnson City, TN at least once a week. Coming over the pass on each side, I would drop into neutral and coast for about 5-7 miles. I'd watch my mpg spike to 99 ..I have 40K miles on my JK now and the tranny is fine. It gets wheeled a lot too.
It might not be a good thing (who knows), but I've probably got over 100 miles on my JK in neutral and no problems.
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Unread 02-16-2009, 08:16 PM   #11
ronjenx
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Originally Posted by Budro View Post
*just wondering how the law could ever be enforced..

If you have a wreck, there is a data recorder onboard that would rat you out.
Most vehicles today have the same.
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Unread 02-16-2009, 08:32 PM   #12
turpehar
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Quote:
Originally Posted by MichelleStarr View Post
So . . . . . nobody actually knows?
First of all, what are you askin? "Would it be a bad thing......"? Meaning, is is bad for the environment, bad for your Ujoints, your conooter valve? What.

Second, did you read your owners manual?
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Unread 02-16-2009, 08:33 PM   #13
ChicagoGuy
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Quote:
Originally Posted by kramer8 View Post
No, it doesnt hurt it. Where i live, the streets are so icy that I have no choice at times. I have been doing it for years as others do too, that i have yet to ever have a problem. Just make sure you dont throw it back into gear when your revs arent matched up.
Don't you downshift and let the engine braking slow you down? Coming out of the mountains on icy roads, if I let it roll in neutral, I'd a) pick up speed like a mo-fo and b) lose control when I tried to brake. You downshift, let the engine slow you down and just use the brakes at the end.
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Unread 02-17-2009, 09:05 AM   #14
JPCHICK
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I just don't think it's a good idea... lol what's the point?
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Unread 02-17-2009, 09:48 AM   #15
juiceparn
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I have actually been proven wrong about this very argument in the past on this forum. Coasting in gear saves more fuel than putting it in neutral to coast. Sure you freewheel with less resistance but you actually don't burn fuel if you are going down a hill in gear without pushing the gas. The engine idle in neutral does burn gas however to keep the engine running.
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