99 f250 heavy heavy trans shudder - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 08-06-2010, 09:25 AM Thread Starter
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99 f250 heavy heavy trans shudder

99 f250 with 7.3 and 4r100. has 200k , trans was rebuilt like 30k ago, trans has a heavy shudder from 30-35mph , feels like im running over the rumble strip, anywho, the truck still moves , and fluid levels are correct, and it feels like the converter is the culprit. trans also has a funny habit of shifting from first , to second for a split second , then directly into third regardless of throttle position.

so im thinking I got a bum tranny rebuild.....any thoughts? tranny was done by a local shop just before i Purchased it.....what should be the next step?
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post #2 of 5 Old 08-06-2010, 10:34 AM
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Line pressure.

I've been told the actual cause of that quick shift.... I don't remember what it was, but I think it was line pressure, worn out pump..... Did they replace the pump?

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post #3 of 5 Old 08-06-2010, 04:39 PM Thread Starter
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dont know if they replaced the pump or not to be honest, calling previous owner to find out more details
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post #4 of 5 Old 08-06-2010, 06:35 PM
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i would say converter, my s10 did the same thing, it was going back and forth into lock-up mode.
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post #5 of 5 Old 08-07-2010, 05:58 AM
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Shudder at that speed is strange. I'm leaning towards converter stator. With the shifting issue also, might scan it and watch how the solenoids/sensors are acting/being commanded. A good ole fashioned stall/pressure test can give some insight as well.

Last edited by FordNutz; 08-07-2010 at 06:02 AM.
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