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Old March 2nd, 2010, 02:24 AM   #21
SageJp
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Originally Posted by keithshotrodshop View Post
What kind of coils are you running? Could it be that the coils are from the fullsize and just way too stiff.
I was told that they are Early Bronco springs, but I have the springs out and it still won't flex. I do have stock TJ springs that came with it, but I don't think thats the problem. plus the jeep has a sb chevy, so it isn't much lighter then a E.B.
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Old March 2nd, 2010, 09:56 AM   #22
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i dont think the problem is the spring considering you took them out completly. i would say the arms your limiting factor. id extend them or make a complete new set and i would think that it would fix the problem.
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Old March 2nd, 2010, 10:05 AM   #23
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Originally Posted by SageJp View Post
I was told that they are Early Bronco springs, but I have the springs out and it still won't flex. I do have stock TJ springs that came with it, but I don't think thats the problem. plus the jeep has a sb chevy, so it isn't much lighter then a E.B.
I didn't realize you couldn't flex it with the springs removed. That's definitely a problem Something must be binding up.
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Old March 2nd, 2010, 10:14 AM   #24
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Can you change the material isolating the arms from the wedges? That's the part that needs to move and is being restricted. What's in there now? How much room is there between teh arm clamp and the wedge on the axle?
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Old March 3rd, 2010, 08:11 PM   #25
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if the rad arms are too tight around the axle it will restrict articulation bigtime..loosen the arms up a wee bit and test it..u may have to make a thin spacer to slip in there.

Rich
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Old March 3rd, 2010, 10:05 PM   #26
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This has been covered really well over on ClassicBroncos. The info given here is mostly correct, the C bushings themselves are what is binding the rotational flex of the axle. Other than switching to a specialty aftermarket arm such as offered by Wild Horses and some other EB fab shops. The only other alternative is to lengthen the radius arm itself, and the longer arm puts more leverage against the C bushing allowing more flex. I am in the middle of this very mod to my Bronco. I dont have real high hopes of making it into a flexy crawler, but I wanted to rid myself of those dreaded drop brackets! Check out this Thread for more Info:
Dan Wheeler\\\\\\\\\\'s Radius Arm Build Thread - ClassicBroncos.com Forums
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Old April 9th, 2010, 12:46 AM   #27
swamper 69
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With a longer radius arm and proper spring rates and shocks, the radius arm set up will flex with the best of them.
This is right out of the shop, 3600 lb Bronc, o miles, tight everything and still maxed 14" travel shocks on the first flex.

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Due to resistance in the C bushings this set up does not flex without springs on a jack but needs a bit of force, eg (weight of vehicle). This is not a bad thing as the resistance of the C bushings creates a light sway bar effect similar to the Anti Rock sway bars from Currie and allows good road handling and roll control with light spring rates. A comparable 3 or 4 link on the road is death without an addded sway bar.

I have done this swap on a couple YJ's the radius arm brackets with stock arms are within an inch of the proper Bronco spacing and flex great even with the stock length arms.
You want no more than 180 lb spring rate for the YJ. Deaver super flex coils for the Bronco are 200 LB , some others are a lot more. A TJ/XJ coil works the best and is in the 170 to 180 range.

For an all round trail road rig this is arguably the best set up going (when properly built). Simple, nothing to wear out besides a few cheap bushings, brutally strong, no extra sway bar needed and complete control of axle wrap.

Last edited by swamper 69; April 9th, 2010 at 12:52 AM. Reason: added pic
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