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Eaton spring (not sure of their web address) has economical sets. Classic performance has mono springs for lowering or stock height. People are leary of mono springs but don't realize that the metalurgy of the springs today far exceed those even produced 15 years ago.
Mono's can be a good choice. I had a (watch the tomato chuckin)(well if ya haveta could you mix in some lettuce too?) '91 Astro van that has mono's on it. I could toss a bunch of concrete bags in it and it wouldn't even squat.
If you have the spring shop redo your set, Have them make ALL new springs and don't let them "rearch" yours. I had that done once and it wasn't worth a dime! I had a new set built by year, make, model and all the spring eyes were the wrong size! I would suggest taking an old one in for a sample, VERY strongly suggest that.
www.eatonsprings.com Built them for Ford since way back in the day! Good people to deal with, knowledgeable about our old trucks and just generally nice people.
Thanks for the info. It'll have to wait till later this fall. Got a new True-Trac for the Supra; when I'm done with that, I'll look at new springs for the back (and possibly the front) for the '63
If you want to upgrade your rear suspension you may want to consider a 4-link coil-over setup. If you are going to pull anything with the truck this isn't a good idea but if it is just a cruiser it would be worth it. Last week I was going to buy new rear springs and shackles but I found a place that makes a 4-link coil-over kit for the same price. That's the way I'm going to go. Look at Chris Alston's Chassisworks. I will probably have to pay $200-$300 for installation and propper setup but I think it is worth it. Just an idea.