Help to find repair alternatives. Case: My truck works perfectly in city but barely sack it on the road and walking on the 110 km/hr and stop accelerating the tacometer is not supported and begins to oscillate (up and down) between 1000 and 2000 rpms and at that time the computer witness is turned on and the box is put in a state of emergency (only second and third speed), they already checked the fault and it is always the same ( I change it but still with the fault, I only stop the car and turn it on again and re-establish it, it already takes it with three different mechanics of transmissions and nothing, one of them said that the temperature seemed high and even installed a radiator for the box of the box, but ...... Nothing the fault is still when I go to the road.
Someone has some idea where the problem comes from
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