Sure Grip unit feels much better than Eaton TruTrac did..

NO offense but I've installed more than a couple of them from Cass. One is road raced severely and has been under the car for 12 years now. He regularly exceeds 150 in a 4K lbs E body. NO vibrations from that diff. Maybe it's a tolerance stack deal and I've been lucky. But I've not had one complaint ever about them. Even in heavy cars with 505" engines going 170mph.