Ok, '91 Silverado, 350 V8 5.7L Multi joint drive shaft. I shreeded the rear U-joint the other night (the one connecting to the rear axle). Now I am haveing a really hard time trying to get what I think is the proper replacement part on this thing. The one I am replacing appears to have all "Inside Lock-Ups" But the one that I got from Advance Auto looks to be similar to my bad one, but the Lock-Ups are outside, not inside. If you look at Advance Auto's Site, it is the Neapco U-joint, P/N: 2-4800 I had purchased the 2-3011BF originially, but the bearings have a larger diameter then the one that went bad. Where as the 2-4800 U-joint, seems to have a similar diameter....but like I said the Lock-ups are different. Anyone have any advice on this?