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I have a complete 12 inch lift that came off of a 1 ton blazer. It comes with 4 Superlift springs, rear angle blocks, shocks, brake lines, two CV drivelines, drop pitman arm, drop drag link(1 ton), and 4" kingpin spacer block(1 ton). Also U bolts. Only problem is that it came off of an 84 blazer. You would have to move your spring mounts. I am asking $800 or best offer
AFAIK, no one makes 12" springs for the '67-'72 trucks at all. /forums/images/icons/frown.gif
The highest you can go for the '67-'72 is 8" on the front springs.
An idea to get taller for these years would be to buy some 12" front springs and take them to a spring shop to have them re-arch them to fit the '67-'72 trucks. This would probably give the springs another 4" of lift, approximately.
So, if you wanted the actual 12" lift, you would probably be better off by getting 8" springs and have them re-arched to fit your truck and they will probably get close to 12" by the time they are re-arched.