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my dad has a factory tranny temp in his escalade and if you just start the truck and beat on it for a min or 2 the temp goes up real quick...but if you start up and just drive normal the temp wont go up for about 20 mins like you said then it might go up a little...and on the highway it goes ALL the way down if just cruising...
 

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even with a 3600 stall and a pretty decent amount oh hp, mine doesnt get above 130 on the Hwy... yours sounds normal to me. the test port is plenty accurate
sorry for jacking your thread but how does your truck drive with a 3600 stall silvermodo? is it your DD? ive heard even a 3200 stall will be very annoying for a DD...
 
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