@Frederic Thanks for incude me in the discussion, which will help me to understand the issue.
I have not experienced the transmission overheating issue till now.
1) Pajero model 3.5
2) 124,000 KMs done so far
3) Transmission Oil changed @ 114000 KMs
4) Mostly I drive in “D” but when tough situationas i ues tiptronics
5) Tyre pressure when off-roading 14 PSI
6) Year 2011 LWB