The newer trannys seem to run hotter by design. The fluid is better and tolerates more heat, and I think the overall efficiency of the vehicle goes up as the fluid temps do due to less resistance in the driveline.
My truck usually gives me around 90*C when driving unloaded in the summer, and about 95*C when towing. I've had it up to 102*C once or twice when pulling steep hills slowly but even that doesn't concern me. I have also heard that 110*C or 230*F is when you should start watching things closely.
Even at 102*C (digital readout) the analog gauge didn't move a hair from the normal middle position.
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2013 F-150 EcoBoost MaxTow, Roush tuned (415hp 506tq), lifted on 33s, R.A.S.
2013 Jay Flight 28BHS Elite (Equalizer 10K hitch)
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