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Alcan or National for some custom springs, I run Alcans on the rear of my '85:
- http://www.4crawler.com/4x4/4R_suspension-III.shtml#LongerRearSprings

Or Marlin Crawler, All-Pro Offroad or Trail-Gear for some off the shelf springs.

Or junkyard for some Chevy springs.

I have the All pro 4" (ish) ones. They are pretty flexy, however I had issues w/ the length; w/ the rear shackle in teh stock location, they rode with the shackle awefully close to verticle. After soem fast riding w/ jumped, one inverted, crammed against teh frame. I have to move the shackle mount forward a bit to get them riding at a better angle.
I'm happy w/ them though

With 200+ Billion electrical parts, the world most complicated machine is inside your own skull.

Question Reality.
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'89 Rnr DLX "SR4.5", 32s w/ 5.29 locked f/r blah blah