have a 4wd suburban if ya take of at a reasonable rate and right around 50 + mph gets a bad vibration like yer running down the rumble strip trans goes into od and goes away but any slower than 60 mph it wants too make a bad vibration i f i take off in D and then shift too od it does it bad ??? abud of mine told me theres a keeper snap ring that will come off in the t case and cause similar vibrations ???