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the problem was changing that fluid! rarely happen, but it will happen when people change transmission fluid on older car then the car messed up. when you change the fluid you washed all the friction material on the clutch surface by putting in new fluid.
There should not need to be any "adjustments" for a normal fluid and filter service for your vehicle, unless you have replaced some parts of your transmission that requires adjustment such as the gearshift lever, intermediate and overdrive band, throttle cable, or transmission range sensor/switch.
With that said, the band adjustment specs are "Tighten the band adjusting screw to 10 Ft.Lbs. (14 N.m.) then back off 2 full turns. While holding band adjusting scew stationary, tighten the locking nut to 35-45 Ft.Lbs. (48-61 N.m.)
There are shift solenoids in the transmission and apparently there's a problem them. I would get it to a trany shop and have it checked right away. If you continue to drive it you will ruin the transmission. Are sure you put the right computer in the vehicle? If you put a computer from a Bronco II with a manual trans in a vehicle with an automatic trans, the trans won't work right.
Your vehicle should have the A4LD trans.Some of those small Bronco's had C-5....3 speed,lockup trans in them.If yours is indeed the O.Drive trans,4th gear in that trans is totally mechanical and hydraulic control.The only electricals in that year trans is lockup apply inside the torque convertor,and that happens after the 3-4 upshift.Later version DID have a solenoid for 4th gear.4th gear consists of the Forward clutch pack applied,and the front band,or O.D. band.This band is applied with a servo piston.It is a steel core piston with a pin and a rubber bonded covering with molded in lip seals.These servos are known for the rubber hardening,and no longer applying the band.Sometimes the band gets burnt to the point of no good,but installing a new piston is possible without removing the trans.Other than the servo piston,or without checking the valves in the valvebody,pretty much the trans would have to come out and be inspected.Good luck.j