Current specs: 1976 K5 blazer 350, 3.06 gears 12 bolt rear 10 bolt front, th350 transmission. I want to run 35's, my tranny needs to get rebuilt so that will come next after I get this gearing thing taken care of.. GRRRRR Im just going to do it!!!!... I need some help though, first I found these 3/4 tons axles for sale http://reno.craigslist.org/pts/286595801.html first off, do you recommend I get these? If so, next.......... I need to know if they will drop right into my truck? will I need to modify anything like my brake lines? will I have to re locate the the leaf spring perches on the 3/4 tons axles? "perches", as in what the leaf springs sit on. Will these 3/4 tons axles be the same width (side to side) as my 1/2 tons axles? Can I use my stock leaf springs? Will I need different drive lines or do I just change out my U joints? Will my stock steering bolt right up or will I need to change anything like the pitman arm? These 3/4 tons axles will be 8 lug right? Please answer these questions completly, these are the questions that are eating me away at night.... Thank you!!