So, I have had this truck since new. 2007.5 2500 MC. Been cross country 4 or 5 times never had an issue.
I was pulling 12,000 lbs trailer on a 19 mile grade super curvy forest road so speed was slow from 5 to 15 mph. 2nd to 3rd gear.
My Trans temp idiot light came on for the first time ever. I...