The last couple of days whenever I use the Tow/Haul the truck makes a squealing noise that sounds like it's coming from the left side of the dash inside the truck. Seems to do it around 1800rpm when accelerating. Any ideas?

 

i have never experienced that problem but ever since mine has been new it makes a weird sound when coming to a stop and it downshifts...almost like a grinding sound

 

If you have it in tow haul and you slow down, almost to a stop tow/haul will sound like a mini jake brake for a couple seconds just not real loud. Mine is a high pitched squeal, Thanks for the reply.