Auto trannie banging in all gears - Ford Powerstroke Diesel Forum
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Old 10-16-2011, 10:18 AM
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Auto trannie banging in all gears

Hi everyone need some help diagnosing again.
2004 F350 6.0 with auto transmission. Stock configuration
NO codes, no flashing OD light
external filter and fluid change via plug 10,000miles ago
Have had some issues with transmission not shifting 1-2/2-3 until revs get very high 2800+-. This stopped after everything came up to operating temp. I lived with it and never looked further other than its an annoyance.
Suddenly today when under hard accelleration it revs abnormally high 2800+ and bangs upshifting in all gears. Considerably less noticable under mild accelleration but it appears to be shifting "Late?"
Where do I start?

Last edited by Piratejonh; 10-16-2011 at 10:19 AM. Reason: can't spell
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Old 10-17-2011, 04:54 AM
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I'll throw some gasser knowledge in here, I don't know if it pertains. But I know when my ol 87 with a c6 was having problems shifting like you described. I figured out there wasn't enough fluid causing the pump to have to work super hard to shift, thus requiring the high rpm's.

Like I said idk if it pertains but maybe your fluid is low?
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Old 10-17-2011, 04:03 PM
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Good thought. It is full when up to operating temp.
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Old 10-17-2011, 04:06 PM
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what fluid was used?
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Old 10-19-2011, 08:51 AM
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Mercon(sp.) from dealer. Red bottles
would there be any benifit in changing filter again or even dropping pan.? Isn't there a filter in there as well. I don't know how to tell if its a transmission mechanical problem or a computer/electrical signal type problem.
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Old 10-20-2011, 08:49 AM
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I dropped the pan. Filter had minute amount of metal particles. magnet was fuzzy but nothing gritty. Fluid was darker than the new stuff but still clear.
Cleaned all and replaced.
So I have a new theory-
While filling the trans fluid I noticed my EGR valve was disconnected from the last time I cleaned it. (A few weeks ago).
I reconnected it and drove it for 20 miles. No change really.
I've noticed that I have no problem at 1/4 to 1/2 throttle. At 3/4 to WOT I chug black smoke and thats when it wont shift. If i let off the throttle it it upshifts. I do not apper to be losing any motor oil. Seems I read something on here about it may not shift if its not making enouggh power.
So how could the EGR affect this? Can I check it for functionality? AM I looking at the ight things?

Last edited by Piratejonh; 10-21-2011 at 06:08 AM.
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