Shudder in shift between 3rd and OD

[kbrennan]

I posted this in the transmissions section earlier, but I don't think it gets a lot of traffic, so I'll post it here.

My 01 f250 developed a shudder when shifting between 3rd and OD. The best way to describe it is that it sounds like the rear of the truck is running over lane dividers for a second. I swapped out a little over 1/2 the tranny fluid and the problem still remains. Is this usually a converter slipping issue, or a problem deeper in the tranny?

[gutterman]

my 99 350 did (does) the same thing, my local tran. shop advised me to change over to mercon 5 fluid. mine was very bad probably caused be overheating pulling rv, he said i could expect to get another year or two out of it if i changed to mercon 5,that was over 5 years ago and it's still pullin campers,it hesitates goin' into o.d. and i usually have to let off the peddel to get it to shift ,but it 's still pullin' ok.