Hi, I have an 06 KC SE. Bought used with 51k. Now it has 67K. When I shift into reverse from park or drive, i hear a slight groan noise, (not a grind but a groan) Its rather low-pitch noise. I'm might be just parinoid. My dad has an 02 ford that does it and 88 chevy that does it. Is this maybe normal? I had the trans oil changed at 60k with OEM oil from an experienced transmission specialist. I called the dealer and they gave me the song and dance of the 85 dollar diagnosis. Is the noise maybe just brake groan too? Any help will be appreciated. Thanks.