In the last 6 months I have put 3 gearboxes on my ccsb . Stock one went out @190,000 , not to bad . I put a aftermarket cardone on it 2 times . 1st one leak out of seal after 3 months . 2nd one started grinding after 3 months . So I finally went and got a acdelco gearbox from gm, seems to turn better with this one than any of the other ones , so far . Wondering if anyone else has had this problem also .