First outing with the 32" tires showed that either my transmission is tired or the trans cooler is not up to the task, as I saw 102*C transmission temperature in low range, in sub-zero temperatures.
So I looked around, Mercedes switched to separate transmission radiators sometimes in 2005-2006, with an 85*C thermostat. This is one of the biggest, from a Vito I think:
Really nice build on the inside: