I know that this thread is old but the problem is still current…. I have bought 2 used sets of gears from Jerry in the past and set them up myself with no issues. I wanted a set of 4.11 for a 9 inch Ford and all he had was new Yukon gears and a Yukon limited slip. I said go ahead and build it. Upon the first few drives a whine on decel developed. I spoke to Jerry who was polite as always but was not interested in fixing the problem or helping me fix the problem. So what I have learned is if you have a problem with something he sells you he will not help. I can also confirm that his shipping practices are subpar at best. My complete third member was in a bucket with some tape over it….. I will not deal with him anymore.