This plate will convert the rear 3 finger output to a 1350 Spicer Flange. There has been a lot of talk about plates like this causing vibrations, but we are able to confirm, during recent tests on our 9500rpm balancer, that this is NOT True. Well at least not for our plate. The pin that our plate is centered on is a direct center line to the differential and transmission. This part is machined with high precision to carry that center line flawlessly. Recent testing on our machine also found yokes with u-bolts and straps to create vibrations. We tested 9 major brands.