I noticed this the last couple weeks too. It wouldn't pull it down as far. Seemed to be stopping in 4th gear rather than going all the way down to 3rd. I haven't driven it enough lately to be sure though. Don't remember it doing that last year.Yes it does lock out 6th but it does not downshift like it used to, someone told me if the truck senses ouside temps to cold the agressive downshifting will be disabled by the tcm. I do not know if this is true or not never noticed it before.
havent gotten anywhere at the moment. ive just been running in tow/haul constantly and havent had any real issues. It seems that if I run in regular mode, with the trans already heat-soaked, w/ tc unlocked at around 12-1300 rpm, the gauge will go from 100 to 190 in about 15 seconds.Thanks for the input guys..
CTD how did you you make out with your tranny temp gauge ??