[Richard]

First, according to Allison, that temp is not a problem.

Second, is this the VDO gauge on the dash, or are you getting this number from a VMSPc.

Third, when you cleared the traffic, did the temp come back down? What does it normally run?

And the big one, the fan under the coach cools the HYDRAULIC temp, not the transmission. The transmission is cooled via a cooler on the aft side of the radiator. Look at the rear bottom of the radiator and you can trace two large hoses in and out of the cooler to the Allison.