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looking for help with tranny issue. 02 ranger 4.0 v6 auto has 110000 miles on it. at highway speeds 65-70mph feels like it strugles to shift, truck will shake and bounce some. when this happens rpm's jump from about 2200 to 3000-3200 after a little bouncing rpms drop to normal. issue seems to be the worst going up hill but will happen every time i hit 65-70. Also the truck will not bounce or shake with the OD turned off and seems to run fine this way.
tranny fluid/ filter just replaced with no change. new plugs and wires
You can use overdrive whenever, the only time you need to disable it is when towing. In my '97 I could stay in overdrive at speeds as low as 35 mph. It is false that OD only engages and helps you at higher speeds. The computer will automatically engage it whenever it deems it to be helpful.
What does your maintenance history actually look like. You say you just replaced the fluid and filter. What kind of fluid, and when was the last time it was changed before that?
I bought the truck 2 yrs ago with 84000 miles on it. This was the first time I have changed the tranny fluid, has always looked ok. Used Castro Mercon V fluid this time
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