[H2 Ranger]

If this condition has started since service, Have them reacheck the adjustments something is not right. Mine has a SC too and I dont have such conditions but mabee someday.... But in Heat regard such has Phil indicated it can be many things Slippage of clutches, lubrication restriction, fluid condition, etc. Do you have a good performance Transmission shop in the area? And a good aftermarket cooler would definitly help. I really dont think you will run into a condition (UNLESS YOU LIVE IN THE ARTIC) where you will need to worry about low transmission tempature. The higher the temp the more friction. Let us know the outcome.