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Something is slipping in 5th or and 6th

Even the engine coolant temp stays under 200*F on the insight and after I top the grade the temps fall back to 190ish. We are ready to travel this summer and do some rv camping. I even spent a bit of money on some bling for the truck. I got a set of front parking/turn signal LED lights. I will have to get oics and post on the bling thread. LOL
 
Maybe they are referring to the 5 speed?
Negative, lockup has always been in 5th for all of them in normal mode unless custom tuned. Lockup under normal steady state driving with a warm trans(temps of 90+) is in 5th gear normal mode, 2nd in tow/haul mode, and at wide open throttle in 2nd gear when converter slippage is less than 600 RPM's.
 
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