Transmission fluid expands when hot, quite a bit actually, so it will read high when the tranny is quite warm, as in climbing hills, etc.

Check it after driving enough to get it up to operating temp, and make sure it stays below the top mark in those conditions, and you will be fine.

Towing a heavy trailer in the mountains will require an additional cooler to keep it from "overfilling" due to heat and associated tranny failure. I've seen this several times, it's not fun.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!