the 231 that came out of my Dad's 78 Blazer almost broke my wrist. We didn't realize how heavy it was, figured we could handle the weight of it. Pulled the last bolts, I thought I had it supported, focker dropped, no way I could support it, bent my left wrist back, heard a couple of pops and I was screaming like bitch. Rushed me to the Dr. then to the ER for x-rays. No breaks, but I had some serious damage that required a soft cast and splints for over a month. Had it rebuilt, then towed the Blazer to a shop to have it installed, they put it on a lift, charged him $150.00 to install it and he was done.