2003 FORD RANGER 4.0 AUTOMATIC CYCLES IN AND OUT OF OVERDRIVE WHEN IT IS ENGAGED.
At any speed, and while the cruise control is engaged, the transmission cycles in and out
of overdrive about every 5 seconds resulting in an approximate increase of 600 r.p.m. each
Your overdrive band might be burned requiring a transmission rebuild.
First thing, check your fluid. Hopefully it will be low or very dirty, in which case a fluid and filter change might do. Otherwise, see Tom;s answer.
You may be feeling the torque converter locking and unlocking errantly. When this transmission first hit the market, I thought it was a 6 speed the way it shifts, engages the torque converter, disengages it, shifts and re-engages it. Still, You may have an internal transmission concern.
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