There is very little difference between 1/2 & 3/4 tons. The front suspension is a bit heavier and the rear (not the front) rails are closer together (11") on the 3/4. Otherwise it is a 1/2 ton. Some of the vendor parts, like the rear sway bar from ccp are made for the 12 ton and will need a bit of adjustment to install but overall most stuff are not a challenge.
http://www.classicperform.com/tech_articles/SwayBarChevyTruck/SwayBarChevyTruck.htm
