Rpm surge at cruising speed, is it tranny issue or something else?
What is your question?
Works fine accelerating through gears until it hits 4th gear then seems to shift back and forth from 4th to 3rd. Doesn't seem to stay in 4th gear steady. this happens at a steady 40-50 mph the rpm drops to 1700 rpm then up to 2100 rpm repeatedly unless I accelerate or decelerate. Noticed to have to add coolant once a week, no obvious leaks.
What seems to make the problem better or worse? warmer temp.
How long have you had this problem? 1 year
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