Do all automatic transmissions...
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Senior User
Joined: Mar 2006
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Do all automatic transmissions...
Do all automatic transmissions allow the vehicle to roll backwards on a steep incline? I was stopped in a parking lot on a steep incline waiting to pull out onto the road and took my foot off of thr brake to hit the gas and I rolled backwards. I thought this was only a manual transmission occurence.
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Joined: Dec 2003
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From: Lancaster, CA
Yes, it is normal. The auto trans can only hold on level or on small inclines. If the incline is steep enough it will roll. Don't forget, that the torque is a fluid coupling, and will allow slip.
Ed G
Ed G
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Thanks for the replys. I will not let it roll back if I can avoid it. I have pulled out of this same place in my old Expedition and I do not recall it doing this. I thought maybe something was wrong.
Posting Guru
Joined: Jul 2004
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I don't know if I believe it to be any worse than holding the brake. While braked the converter still has the same torque applied. It should generate no more heat than if it were braked! The trans is still in drive and holding the brake merley locks the wheels allowing the torque converter to still do exactly what it was doing as if on an incline.
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Originally Posted by KevinM
I don't know if I believe it to be any worse than holding the brake. While braked the converter still has the same torque applied. It should generate no more heat than if it were braked! The trans is still in drive and holding the brake merley locks the wheels allowing the torque converter to still do exactly what it was doing as if on an incline.
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Posting Guru
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He did not mention increasing the rpms, just not braking on inclines! My truck holds on pretty good incline with the foot off the brake!
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Posting Guru
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No air thru the radiator, the last I looked I have a fan. Creates quit a bit of airflow, enough to keep the engine temp constant, and the AC condensor cool along with moving air thru the trans cooler!
Me thinks someone is grasping at straws!
Me thinks someone is grasping at straws!
Posting Guru
Joined: Sep 2002
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From: North Carolina
Hey Kevin.... If you pop the hood on your truck you will notice that the trans cooler is mounted much lower than the radiator. The stock clutch fan on these trucks will not pull enough air through the cooler to make any difference at all. That trans cooler actually relies on air coming into the front bumper opening while driving down the road.
Posting Guru
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Maybe yours but mine is right in the middle of the airflow at the bottom of the radiator, and I hate to differ with you, if that fan was so inadequate the AC would not cool under idle the condensor coil would over heat, and the AC unit would not have much life and the engine temp would go up. On the contrary the multiple blade high pitched fan pulls quit a bit of air. Besides that, the mere fact that there is more cooling surface on the trans cooler to dissapate heat, that alone pulls oil temp down. The clutch is there so at higher speeds the fan basically free wheels.
It does not take much airflow to cool trans oil under light load!
It does not take much airflow to cool trans oil under light load!
Posting Guru
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From: North Carolina
I never said that the fan was inadequate. I said that with the position of the tranny cooler there wouldn't be enough air flow at idle to make a difference. The radiator and the AC condensor are a totally different story. They are positioned directly inline with the fan and it has a shroud over it to direct air flow through the radiator. If you do any towing of any kind of camper or boat I would strongly suggest changing out the factory Trans cooler anyway. The tranny cooler on these trucks is way too small to sufficently cool the fluid under load (climbing hills with 8000# on the back of the truck) I think you misunderstood what I said earlier. The trans will not get hot enough to cook anything while sitting with the brakes on nor will it got hot enough while sitting on a hill with the brakes off. The trans generates the most heat while trying to get the vehicle moving and during towing conditions. Then the bumper holes come into play for cooling.
Elder User
Joined: May 2004
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From: Mirror, Alberta
That good old 2 positon on the shift indicator
Originally Posted by XL1200LTD-Keith
If you drop it in 2nd it will hold it on the street, I am not sure about off road extremes.
I also learned that the 2 position remaps the throttle setting to give about a half throttle effect.
Information like that is what I love about this forum!