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The gauge on the dash for trans temp has a sensor in the bottom outlet of the trans cooler. The trans cooler is an integral part of the radiator on your coach. Open the hatch, look at lower left at bottom of radiator.

Are the temps you are quoting coming from the VDO gauge on the dash, OR a digital signal feeding a VMSPC, Bluefire, or Scangauge?

The digital temp will come from a sensor in the transmission.

The cooler in the space above the rear axle is for hydraulics.

Thanks for clarifying Richard, just have not spent enough time under mine tracing the lines to see what was going to what. 

Not to get too far off topic but do you know what controls the fans on the hydraulic cooler? Is it the temp sensor in the hydraulic tank? 

I will have to look at mine to see where the transmission cooler lines are running.