Sounds like a transmission fault. Sounds like a nightmare but it is not and could be very cheap to repair if you are handy. Ford transmissions retain hydraulic accumulator servos with large snap rings. Occasionally a snap ring breaks disabling the accumulator and possibly the snap ring fragments interfere with valve body function. I recommend that you check out YouTube contributor 'Mustie1' and his "Ford f150 transmission repair".
SOURCE: Auto transmission. When in
go to a transmission guy.
they should able to let you what the problem is.
check the transmission fluid first.
SOURCE: 1998 ford ranger 3.0 motor auto.transmission slips driven cold
what is the (revolutions per minute) rpm of your engine when the torque converter engages, was the torque converter rebuilt too? what type torque converter is in the ford ie low stall where it engages the gear box at around 900 to 1000 rpm. has there been any power band adjustment by the company that rebuilt your automatic transmission after the insallation.
SOURCE: 5th. Gear
Sounds like you may have bent a shift fork or your cluster gear has some missing teeth on it now. I would venture to say that is it a bent shift fork. This will require the transmission be removed to gain access to inspect and repair.
SOURCE: 1992 Mitsubishi Eclipse transmission slips in overdrive
well the low cost way to go first would be to try and change the trans fluids. If the problems still remains the it may be an internal problem
SOURCE: Overdrive light is flashing and tranny is slipping in drive and 2nd
my overdrive light is flashing due to a shattered speedo cable tip. check your fluid level. you may have to change the tranny filer and redo all the fluid.
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