My wife's 05 RK MT conversion started making a whirling ginding noise and strange rattle. I tore into the rear end and found a bad bearing. I called MT for some removal instructions and even though their warranty is 3 years and 60,000 miles and her kit has been on for 7 years they said get it to them and they would either totally rebuild or replace the rear end at no charge. I removed it and took it down to them. I got there at 8 am Monday and they had a guy ready to work on it and 4 hours later they had it totally rebuilt and painted and loaded into my truck and I was on my way back home to Colorado. That is what I call above and beyond the call. There is no way I expected that. Just wanted to pass this on and give MT a big thanks. If you are thinking of a conversion kit I would say you can't go wrong with MT and they do make both a solid axle and an IRS kit. We have two of them.
Just my experience,
SR