Hoss

From the time I test drove my new truck (about 1000 miles ago) I noticed that the transmission felt kind of rough when you are first getting started from a stop. Almost as if something is grinding. I feel it more now that I have bigger tires.

Is that normal for the 6 speed auto tranny or is it something I should be concerned about?

New2Diesel

With the stock trans mine did the same with comparable mods using your sig as a reference. Mine lasted 20K miles before I had problems.

Hoss

Just to clarify, mine did it stock. As I said, I noticed it the first time I test drove the truck with only 200 miles on it. I didn't think much of it until I put bigger tires on and that seemed to enhance it. This was prior to installing the H&S or deleting anything, so it isn't related to that.

HL649

That is not normal for a stock truck. Mine is as smooth as butter with or without a trailer when starting out. I'd take it in and have the dealer look at it.