I know the feeling my truck has not been a 2 wheel drive for close to 30 years lol
Look at Spring rates as well you want something that hits close to stock and not ride like you cut the stocker in halve
Cpp has heaver then stock springs and do not publish there spring rate seen enough threads why does my truck run rough there like a rough country lift its going to ride rough
Here is a thread i found with spring rates 1/2 tons are around 1018 lbs
http://67-72chevytrucks.com/vboard/s...d.php?t=697795