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Here in the great white northwest(B.C. Canada) we see this all the time on many models. This is caused usually by front seal inversion. This is a phenomenon due to poor venting, cooling, excessive heat, big trailers, and driver error. It usually happens on a long uphill, on a hot day(85 F or better). This seal will normally revert to it's normal state as the trans cools, causing confusion of owners, and mechanics as there is no obvious leak. Tow truck drivers in the mountains are quite familiar with this problem. Fill the trans up, and go again, if you didn't burn it up.
This circumstance can be avioded by manually downshifting, if possible, out of OD before hills, and an occaisional look under the vehicle to check for accumulated dust etc. which might plug the vents. Checking often for clogged trans and gear box vents is recommended. Mud wasps love tubing. Regularly washing the external area of the radiator, AC condenser, and trans cooler if present, might avoid this. Often, the overdrive is ruined by this happening.
Just a Guess, Mike |
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