Chevyforlife347

I think it's in trans but not positive just took a good peek at the rear diff everything was tight couple very small chips on magnet. Noise happens only above 35 40 n gets worse it a whirling grinding noise sounds like a bad bearing. It used to only happen when I let off gas now it's even when I push it n it's only for couple seconds most pretty Loud, drive shaft is tight small bit of trans fluid at end of tailshaft not much but i can see the splatter on the underside of cabin. Anybody know what it is it shifts and runs through gears fine if im on an incline it hard to shift from park gives clunk not sure if it's related