i am looking to get new 56" springs for my 67 LWB truck. i want them stock height because i have a shackle flip for them (i cracked my stock rear mounts). i am looking at a page with many spring rates and applications (JC Whitney). right now i have 5 leafs and an overload and 4inches of lift. and i am olny seeing: 9 leaves, 7 leaves, and 5 leaves Heavy Huty. i have skyjacker springs and i dont think they are heavy duty. what spring should i get? i want a decent ride on the road, but i also want to tow eventually, so should i keep my over loads or do the springs usually come with them?thanks for the advice. does any one have any part numbers for New 56's? i dont want to get saggy springs from the junk yard and i also want the ones with the teflon spring pads for a better ride. thanks again guys.