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Looking to build long radius arms

jeremy70bronco

New Member
Joined
Sep 17, 2010
Messages
44
Loc.
sisters
I want to build some new longtravel radius arms and wanted to now if anyone had a set so i can get some info off them.. like how long they are and how much caster for a 3.5" lift.. and any other info would be nice.
 
Last edited:

Punisher

Sr. Member
Joined
Nov 25, 2004
Messages
505
You can usually get them from the junkyard for a good deal. Look for any f150 or broncos up to 79. I think they are all the same.
Iv made three sets out of stock arms and some 2x4 tube.
 

Punisher

Sr. Member
Joined
Nov 25, 2004
Messages
505
When I made mine I just added 13" to the stock length. I can't help you with the caster cause I cut and rotated the knuckles so I really didn't have to put caster in my arms.
I guess you could put your bronco at stock height measure it then up to how much you want to lift it and measure it again to know how much you need to put on the arms.
 

garberz

Bronco Influencer
Joined
Jun 24, 2007
Messages
6,864
Loc.
Conejo Valley, Ca.
You don't need to add any caster over a stock arm. By adding more length, like 10", that will add about 2 degrees more caster just because it will be mounted farther down the frame. More than likely you won't be able to run 7 degree bushings with longer arms, because the front pinion angle becomes too severe. How tall of coil springs are you using?
 

70_Steve

Old Guy
Joined
Dec 13, 2002
Messages
8,317
Contact "Lars" here on the board and ask him about his "Lars Bars"
I have a Doc file that's just a collection of Lars' posts (and a few others) and pics from his write-up on the NorCal Bronco's site. It's what I used to build mine. PM me your email address and I'll send it along...
 

xcntrk

Bronco Guru
Joined
Jan 12, 2012
Messages
2,473
Loc.
NOVA
Here's a few ideas to get the creative juices flowing...





IMAG0885.jpg


5Eb5F75Je3Lb3F43N9c8s6b04b16d76121a02.jpg


DSC00081.jpg


IMG_6486_zps68e80a38.jpg



;D
 

garberz

Bronco Influencer
Joined
Jun 24, 2007
Messages
6,864
Loc.
Conejo Valley, Ca.
i only went to a 3.5" lift

With 3.5" coils you won't be able to add any more caster. The 7 degree bushings will be right at limit on your pinion angle. So, keep the arms the same as stock, as far as caster goes. To gain more caster you'll need to turn the yokes back to maintain the correct pinion angle.
 
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