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Message: <blockquote data-quote="r3dn3ck" data-source="post: 1517444" data-attributes="member: 9214">That's weird. I'd used delrin bushed MM arms before on a stock k-member. Oh well. I guess the K-member is going to get done too. Thanks lads! I have no idea why it was fragging diff covers. I was using stock covers at the time. I think it had to do with the bushing setup that the prior owner of the IRS put on it. The front diff bushings were all metal, either aluminum or steel, but not the rear mount and the rest of the bushing set was in not great shape. The flex in the rear would have been incompatible with the zero flex in the front causing binding and eventually breakage. I didn't know that at the time. My assumption that it was the bushing mismatches is based on the fact that it would blow the ears off of aluminum center sections which I wouldn't know about immediately followed soon by fragging the rear cover which I usually found out about right after parking and seeing the trail of gear oil. I was poor then and prone to getting work done by homies and what must have been the worst mustang tuner in existence at the time. This time around I'm not poor and I take it to a shop staffed by guys with 40 years of race car and fabrication experience and I'm a lot more experienced so I run the ideas I think are questionable past you guys. If you barf at it then I reassess and modify plans accordingly. The new shop I use does perfect work every time and they charge appropriately for it. Everyone else charges the same amount but few can seemingly be trusted to actually do the work up to a useful standard of quality. Hard lessons to learn in life #1: buy once, cry once is a law of nature.</blockquote>