Neutral>Drive Jump
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Senior User
Joined: Nov 2007
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From: New York City
Neutral>Drive Jump
Whenever I pull up to a red light, I always put the my 2wd 390 AT into neutral. Pressing the brakes down firmly and shifting into Drive, the truck always knocks, lunges up. Sometimes more noticeable than other times. Less when its warmed up. Is this normal? Could it be my engine mounts?
Posting Guru
Joined: Jun 1999
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Could be
the motor mounts. Stand off to the side of the truck while it's running, hood open and have a bud work through the gears...just like you're at a light. If it jumps up or down, check the mounts. Why do you slide it into N there...does it want to die at idle?
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Senior User
Joined: Nov 2007
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From: New York City
It idles fine. Just put it in neutral as a habit. Used to have overheating issues in the summer and by putting into neutral increase fan speed. Thanks, will look into the mounts.
Cargo Master
Joined: Oct 2010
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From: Ideeho
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Senior User
Joined: Jul 2003
Posts: 290
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From: Las Vegas
Hey Phil,
Glad to see you found this place/site. A lot of good folks, good info and a lot of "green-horn" types of questions that a fellow with your experience and wisdom will certainly be a welcome addition. Good to see another M&Mer. They wouldn't let me keep my horseb---z user name here.
Gene
Glad to see you found this place/site. A lot of good folks, good info and a lot of "green-horn" types of questions that a fellow with your experience and wisdom will certainly be a welcome addition. Good to see another M&Mer. They wouldn't let me keep my horseb---z user name here.
Gene
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Thread Starter
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Senior User
Joined: Nov 2007
Posts: 120
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From: New York City
Alright, checked the motor/transmission mounts and did not see anything out of the norm. Upon further inspection, the "lunging" starts right when the drive shaft engages the diff. Substantially more in N>D than N>R. Maybe just the nature of the beast.
New User
Joined: Jul 2008
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From: CBURG,PA.
Hey Phil,
Glad to see you found this place/site. A lot of good folks, good info and a lot of "green-horn" types of questions that a fellow with your experience and wisdom will certainly be a welcome addition. Good to see another M&Mer. They wouldn't let me keep my horseb---z user name here.
Gene
Glad to see you found this place/site. A lot of good folks, good info and a lot of "green-horn" types of questions that a fellow with your experience and wisdom will certainly be a welcome addition. Good to see another M&Mer. They wouldn't let me keep my horseb---z user name here.
Gene
I was just lurking around and noticed that i joined here in 08,so i just logged in and joined the discusion.M&M seems to be alittle slow lately.Trucks are a change of pace as it is a big part of Fords history and mine.Most of my years were spent under the hood of these beauty's.
Phil
Cargo Master
Joined: Oct 2010
Posts: 2,674
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From: Ideeho
Might want to look at the backlash in the ring and pinion. Chock the wheels, Put the truck in neutral, crawl under and see how far you can turn the driveshaft either direction before it stops. Let us know what you find............
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