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I have had my truck for about 8 months now and every now and then the od with slip and the tranny with jurk the s@it out of the truck it will go from 3 to4 and if your going under 50 it will drop to 2 then shift to 3 when u hit 55 then it will if its nice work right. i need some help its 90 F-250 7.3 reg cab 4x4 8 footbed e4od 3.55
Is your OD light blinking? The first thing I'd do is draw the codes from the computer whether it is blinking, or isn't, to see if the computer can help you pinpoint the problem.
There are two sensors which can cause problems similar to what you're describing.
RPM Sensor
Vehicle Speed Sensor
I've written you an email which if you reply to it, I will send you a zipped file of E4OD information which has tests in it for these sensors and for the others along with other E4OD goodies. R.A.