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My neighbor stopped me on the street and was asking me about this, he has 88 bronco II and said he'll be driving down the highway at 55mph and all of a sudden it'll just downshift and top speed is 35mph. Anybody have any ideas?
Not much to go, so if you can get him to go through his problem in a little more detail, it would help. A first guess is, is the transmission fluid full and in good condition?