Everytime I start my truck the RPMS start at about 1300. You gotta sit there for 2min till they drop. If I switch into gear (lets just say rear) without waiting you'll here a grind. A friend of mine with an 05 hemi told me it just sounds like the electronic shifting. I just want to make sure I'm not going to harm my tranny. I usually wait till it drops till 1k or below. I could be fresh off the highway warmed up and all, if I turn the truck off and on again it does this. What are your thoughts?