Weird sound from tranny???
 

??? My 47RE is making what sounds like a very heavy (and loud) metal-on-metal rubbing noise (not quite a grinding noise) when it shifts into high gear. Only does it when the truck is under a little load, like pulling something or even shifting into high gear while going up a steep grade. All other shift points are fine.

Took the Service Manager at the local dealership for a ride and he said...and I quote, "That is caused by all the torque these engines make. That is normal."

The noise is VERY loud when the truck is under a load. Been doing it since brand new and I'm thinking this can't be good...just sounds way to nasty when it happens. Truck has just over 800 miles on it now. Any suggestions? Your thoughts on this being "normal"?