I am doing a custom job here. I need to know the height difference between the axle and radius arm mounts on a typical 4-6" lifted F-150 or bronco. I have a set of straight radius arm and a set of custom bent radius arms. So I'm planning on using the custom bent arms right off.

Thank you

I am doing a custom job here. I need to know the height difference between the axle and radius arm mounts on a typical 4-6" lifted F-150 or bronco. I have a set of straight radius arm and a set of custom bent radius arms. So I'm planning on using the custom bent arms right off.

Thank you

Since you're planning on using radius arms and C-bushings, you should set your radius arm angle such that your caster is correct at the knuckle unless you're planning on cutting and rototing the knuckles. With adjustable C-bushings available, I would suggest using the 7 degree bushings and then setting the caster on the front end...that should move your mounts up as much as possible to help keep them from grabbing every rock on the trail. Keep in mind that depending on your transfer case height & angle, you may need to cut and rotate the knuckles anyway in order to get your pinion angle in the ballpark.

Thank you for the quick responce. This is the first set up I have ever done. So please forgive my ignorance at times. Do to the vehicle I am installing this in the trany/transfer case cross memeber will be seperate from the radius arm mounts. I will keep an eye on the angles of the drive shaft.

Dang now you have me thinking about the angles and knuckles Dang.... I have alot of homework to do.:eek:

Since you're planning on using radius arms and C-bushings, you should set your radius arm angle such that your caster is correct at the knuckle unless you're planning on cutting and rototing the knuckles. With adjustable C-bushings available, I would suggest using the 7 degree bushings and then setting the caster on the front end...that should move your mounts up as much as possible to help keep them from grabbing every rock on the trail. Keep in mind that depending on your transfer case height & angle, you may need to cut and rotate the knuckles anyway in order to get your pinion angle in the ballpark.



7* is what I used on my SAS, with extended radius arms that are mounted ~2" below the frame rail.

Keep in mind if you order the 7* kit, you will get two 7* bushings and two 4* bushings. The 4* go in front of the axle and the 7* go behind, if I'm remembering correctly. Either way they'll come with instructions.

Cool. Thanks for the tip.:grinpimp:

Do you still want the measurements?

yeah sure if you have them right handy.

Dont stress on the caster angle, I only guessed on mine and have had no problems on asphalt at all. Just as long as its leaned back a little bit you will be fine. To be sure though, I would recommend to not be lazy like me, and use an angle finder. I used the stock degreed bushings (2 degree I think) and set caster with the radius arms because I was extending them anyway.

http://www.pirate4x4.com/forum/attachment.php?attachmentid=250406&stc=1&d=1150530782

http://www.pirate4x4.com/forum/attachment.php?attachmentid=250405&stc=1&d=1150530782

Dont stress on the caster angle, I only guessed on mine and have had no problems on asphalt at all. Just as long as its leaned back a little bit you will be fine. To be sure though, I would recommend to not be lazy like me, and use an angle finder. I used the stock degreed bushings (2 degree I think) and set caster with the radius arms because I was extending them anyway.




Those look damn nice. Feel like cutting up the material for another set?? :grinpimp: