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Slight Shudder

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Old Feb 11, 2010 | 07:49 AM
  #1  
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Slight Shudder

I have a 2007 F-150 Regular Cab 4WD 4.6V8 Auto w/ 52,000 miles. I can feel a slight shudder when accelerating or slowing down at 25-30 mph. I have all new brakes and tires, but this problem started before that work was done.
Any ideas?
 
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Old Feb 11, 2010 | 01:18 PM
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Best guess, tranny shutter- replace the fluid & filter it will probably be fine.
 
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Old Feb 11, 2010 | 01:26 PM
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OK, thanks. I'll try it. Never heard of this problem or fix before.
 
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Old Feb 11, 2010 | 02:12 PM
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Not sure....do the 4.6L trucks have an external transmission cooler? If not, add one while you're changing the fluid/filter. It'll save you money in the long run.
 
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Old Feb 11, 2010 | 02:34 PM
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Yes they have an external cooler- more than adequate.
 
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Old Feb 11, 2010 | 03:07 PM
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If it shudders when you slowly take off it mite be the slip yoke on the trans output. It was on mine, a little lithium grease on the splines and no more problem.
 
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Old Mar 2, 2010 | 07:35 AM
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So, I had the tranny flushed and still have the problem. It's NOT the "clunk" from the slip yoke. I have a vibration / shudder at around 25-27 mph (going straight, not turning) both accelerating and decelerating.
Hate to take it to the dealer, but ....
 
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Old Mar 22, 2010 | 01:06 PM
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So, last week the dealer performed a TSB (09-20-14) that he thought would help. It didn't.
Took it back today for the same symptoms. Dealer just called and they are putting a new tranny in it under warranty (58,525 miles).
Great service. Very commited to customer satisfaction.
 
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Old Mar 23, 2010 | 09:16 PM
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Does the shudder feel like your hitting the rumble strips on the side of highway?
 
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Old Apr 26, 2010 | 02:56 PM
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Have had the new (Ford rebuilt) tranny in the truck for about 1200 miles. STILL have a harsh downshift at 25mph. The Ford engineer drove the truck and attributed it to "normal tolerance stack".
Yeak, OK. How come it didn't do it when the truck was new? He couldn't answer that. Both the engineer and the lead mechanic at the dealer feel it and agree that it is there, but cannot give me a decent explanation for the shudder I feel at 25 mph when coming to a stop.
Frustrating .... to say the least.
 
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