So here is the story. I have a 81 k10 sub, it had a 12 blt in it. I bought a 14 blt ff rear end from a military surplus place. I had the bright idea to measure the spring perches before we broke our backs getting it in place and the 12 blt perches are 42.5 inches from center to center, the 14 blt I bought are 40.5 from center to center. Also the shock mounts are like 2 inches off. So whats the deal? Everybody told me that it would bolt right up! Can I just cut off the perches and reweld them in the correct location? Or am I screwed!!! Any ideas out there. Please help I got a 14 blt taking up valuable space in the barn when it should be under my truck!!!