Does Altitude cause Trans Leak?

[TwoBearBill]

I towed our RV with our 2001 F450 today, from 4000 ft to 8500ft - lots of downshifting and time in second gear - when we got to the RV park, trans fluid was leaking all over the place, but stopped and the temperature was about 165 according to the gauge.

Would the altitude cause the fluid to expand and run over?

Fluid level now is not showing too low.

[jesilvas]

Nope. Overheating will cause this though. Maybe some other things. There's a few threads actually about this and then some never had an issue, some had problems after.
What kind of gauge and sender was installed where?

[TwoBearBill]

My gauges are made by BD Power, and so far all have proven to be very accurate. Couldn't tell you where the sender is without some research, though. Hopefully, it was just the vent lines venting.
Thanks for your help.