Normal temp of each brand and transmission depends on where the temps sensor is, what kind of trans fluid is used, line pressure used by the trans(generally more horsepower/torque = more line pressure to hold the clutches), and the design of the trans. The stock 68RFE is notorious for burning up over drive clutches especially when power is added so I prefer to keep the temps as low as possible.
My car has the 8hp and the trans normally runs around 195F. However it uses different fluid, is mated to an engine with a lot less horsepower/torque, is moving a much lighter vehicle, and is designed differently than the 68RFE in my truck. Most importantly, it reads its temp from the trans to the cooler which tend to show hotter temps than the sump temperature where the 68RFE gets its temp.
