99 f250 heavy heavy trans shudder

[INT_MAN]

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?

[SixStringMadness]

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?

[INT_MAN]

dont know if they replaced the pump or not to be honest, calling previous owner to find out more details

[Turbophein]

i would say converter, my s10 did the same thing, it was going back and forth into lock-up mode.

[FordNutz]

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.