Tranny shudder? - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 07-06-2009, 04:42 PM Thread Starter
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Tranny shudder?

I dont know how to explain correctly but the issue is:
When the tranny make changes between gears (more noticeable between 2nd to 3th and to 4th, has a short shake (less than one second) and it is more intense or severe (but not longer) at WOT. I dont know if that is a shudder or not, and what could be the culprit of it: the tranny converter? or the clutches in the tranny?
The tranny changes good and the TC locks fine and when it has to do it. No OD light flashing.

Any ideas?

Thanks in advance.
F250 1996 4x2, EO4D, 143000 in the odo.

Last edited by CELAYORK; 07-08-2009 at 05:43 PM.
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post #2 of 21 Old 07-08-2009, 05:27 PM Thread Starter
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BUMP, BUMP. Any one?
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post #3 of 21 Old 08-05-2009, 10:08 AM Thread Starter
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BUMP, BUMP. Any one?
Any takers?
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post #4 of 21 Old 08-05-2009, 10:14 AM
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Couldn't buy a clue...

The above opinions are my own and should not be substituted for common sense.

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post #5 of 21 Old 08-05-2009, 10:21 AM
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Check your tranny fluid level. Mine did it when it was low.

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post #6 of 21 Old 08-05-2009, 10:23 AM
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Could be many things actually. Might not even be the trans at all. Have you scanned for any trans slippage codes? Do you have a way to measure the line pressure? Have you checked the integrity of your mount and driveshaft center bearing? How would you rate the "quality" of the shifts. Long and soft? Short and crisp? These things are notorious for converter failure. In my case when I rebuilt mine the pump failed. A less common problem than the TC but still common. There are updated pumps out there to correct the problem I had. FWIW I never had the OD light flash either.

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post #7 of 21 Old 08-05-2009, 05:59 PM Thread Starter
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Couldn't buy a clue...
Thank you.

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Check your tranny fluid level. Mine did it when it was low.
The tranny fluis level is ok and the fluid is fresh, about 3k miles.

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Could be many things actually. Might not even be the trans at all. Have you scanned for any trans slippage codes? Do you have a way to measure the line pressure? Have you checked the integrity of your mount and driveshaft center bearing? How would you rate the "quality" of the shifts. Long and soft? Short and crisp? These things are notorious for converter failure. In my case when I rebuilt mine the pump failed. A less common problem than the TC but still common. There are updated pumps out there to correct the problem I had. FWIW I never had the OD light flash either.

My $.02 worth, for what it's worth.
I cant get a scan for codes and dont have a way to measure the pressure. But Im going to check the mount of the driveshaft and the bearing. The "quality" of the shifts IMHO are ok, not to long or short, at low throttle they are soft, only at hard acceleration or WOT the shake (shudder?) is present.


Thanks to all of you for your time.
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post #8 of 21 Old 08-05-2009, 06:06 PM
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Have you cleaned your tranny filter or changed it? How was the fluid? Did it smell burnt?


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post #9 of 21 Old 08-05-2009, 06:16 PM Thread Starter
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Have you cleaned your tranny filter or changed it? How was the fluid? Did it smell burnt?
I changed the tranny filter with the fluid. The fluid was OK and without burnt smell. and IMHO I found a normal debris in the magnet.
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post #10 of 21 Old 08-05-2009, 06:19 PM
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Also check your universal joints, Might need some greese.


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