Is there a heater of some sort in the tranny on these trucks? I ask because my tranny temp gage comes up within less than one minute after startup first thing in the morning no matter how cold. It'll reach nearly it's normal position before the engine temp gage even budges. I can't believe that it could warm up so fast without help. It seems to act as though it's reading exhaust temp.
Most likely, you have a faulty TFT sensor in the trans.
I doubt it. My tranny is almost to the middle mark when the Scangauge has the actual temp still under 100 degrees. Got two neighbors trucks that have similar readings. The factory gauge works more like a stepper swich with not enough levels in it. Junk!
"05 F-250, 6.0, CC, LB, 3.73, 4 X 2, Lariat, with coolant filter and Bilstein shocks, Magnefine p.s. filter, Ford fuel press. spring upgrade and ScanGauge ll. S. Ca.
"69 Mustang, Mach 1, 428 CJ, Ram Air, Stock
2007 FHLP H.D. Road King
2007 Thor Jazz 5er, 11k dry weight, 31'
173rd Abn. RVN.
I doubt it. My granny is almost to the middle mark when the Scangauge has the actual temp still under 100 degrees. Got two neighbors trucks that have similar readings. The factory gauge works more like a stepper switch with not enough levels in it. Junk!
The OP said his gauge reads in the middle in less then 1 minute, I'll bet his actual trans temperature starting in the morning will increase less then 5 degrees in 1 minute.
At idle in park all of the torque converter is spinning. There is very, very little energy being used in the converter. In gear only half is spinning. Now there is significant energy being used, which will heat the fluid. In park there is almost no heat being added to the ATF.
The stock gauge is calibrated to be in the middle of the range when the trans temp is between 50 and 230°F.
__________________ Mark Former Ford Automatic Transmission Engineer
“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
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