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Jeep YJ Fiberglass Leaf Springs - Fiberflexers

Posted in How To: Suspension Brakes on February 1, 2007
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Photographers: Jack Arrington

This just might be too revolutionary for some of you. You leaf-sprung Jeep guys might not want more flexibility out of your suspension. And you probably don't want to lose more than half of your spring weight. And who the heck would want orbital eyes in place of bushings for improved suspension movement? Yeah, our YJ owner was pretty skeptical too. We almost had to bribe him to throw on Teraflex's new fiberglass single-leaf spring wonders for YJ Wranglers. He complained that they weren't going to flex, and that they would probably shatter once he hit some rocks with 'em. But now that he's tried 'em out on the Rubicon Trail, we haven't been able to get them back from him. It's no wonder; he's seen the light, or should we say the superlight.

Teraflex has them available for a YJ Wrangler right now. You can get a complete kit to convert a bone-stock YJ to the supreme rock commander, or as a spring-only kit to retrofit already-built YJs. We took our rockcrawling Wrangler and did a quick spring swap in almost no time at all.

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Our test vehicle was already built with 1 1/2-inch-lift steel leaf springs, so we knew we'd be dropping some height. We took measurements and found that we'd only lost 3/4 inch in height, putting these fiberglass springs at about 3/4 inch taller than stock springs. They won't settle too much since they are fiberglass and not steel, so we'd guess this is what you'll see even after months of usage.

We sent our tester on his merry way with a mission. "Go pound on these springs for a while and tell us how they work. Oh yeah, and see if you can snap one." You should see the smile people get on their faces when they're told to actually try and destroy something.

Our test Wrangler headed out with the Wine Country Rock Crawlers for the Rubicon Trail to see if he could do some damage to its new suspension. Four days had passed when we got a phone call from a sort of bewildered tester. He'd noticed the harsher ride from the orbital eyes instead of bushings and had automatically thought he'd be in for a rough weekend on the 'Con, but he reported he could twist the heck out of 'em. The monoleaves gave more movement than his steel leaf springs ever did-so much so that he is having to do some more fender trimming just to get his 36-inch Iroks to fit at full stuff.

He'd also given them a sufficient rock beating, dropping the Jeep's monoleaves directly onto rocks, and using them as ramps onto boulders. The only thing that peeled or split was the textured paint on the fiberglass spring.

The monoleaves passed a severe-beating test that would've snapped some leaf springs, and handled it with more flex and less axlewrap. Maybe you should try a set too.

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