i have a 2009 gmc 1/2 extended cab. 5.3 3.73
had it since 2009. on first trip to bakersfield, 107 outside. engine temp 204, tranny temp 243. i called Mataga in stockton, and they assured me that was fine. i have had it in the shop for the tranny but they still say it is fine. many time the truck will jump, but still they say it is fine. 4 time when going uphill with trailer, when i come to a turn, as i slow down it won't go around the corner without a full stop. Again Mataga says this is all normal, and they do not see any problems. what i do hear is you do have a extended warranty. my next truck will not be a GMC.
TT 2006 trailblazer loaded is 6100