I am installing a Rancho 4" Lift I purchased from a private party (OK it's used ) and I have everything except the install instructions. Does anyone have the measurement for moving the radius arm brackets and or any other Rancho specific info. (Maybe if I'm really, really lucky, someone may have the manual in some form that could be posted to the tech section or my email inbox )Skyjacker is the only company that has the manual for the TTB's online.(Why is that?)

Any help would be appreciated. (Especially if it comes before I something up.)


Rancho 4" Suspension System for an 84 Bronco (RS6570)
w/Extended Radius Arms and add-a-leafs

Thank you for your time and assistance.

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...and who pulls the Chevys out when they get stuck? In the Chevy forums nobody seems to be willing to help out other Chevys. Well, at least not without a fee. Maybe their BowTies are too tight???

 

Just measure a point from the axle back to a fixed point on the frame (I use trans crossmember) with the factory arms and brackets on.

Then install the new arms and brackets, line up the axle with the original measurement, and mark/drill the frame through the bracket.

 

Are u talking about the arms for the axel, or the "radius arms", cause i thought the arms just go at the same spot, just lower?

 

I have a tuff country w/extended radius arms, they have dirrections online, im pretty sure they werew 14" back from where the factory ones were

 

Any chance any knows where I can the Bushings (or size) - for the older Rancho radius control arms RS6570. If anyone has a copy of that manual that would be great!
Chris

 

I found the Rancho directions somewhere online... installed mine a few months ago. They were 15" back from stock. I also used Energy suspension bushings, even though the directions said to use only factory bushings.

 

I have attached 2 versions of the Rancho instructions: Rev. A and Rev B.
15" is the correct number for relocating the radius arm brackets.
The last time I went looking I could only find the larger style radius arm bushings to be made by Superlift. That was in 2019 or so. There may be others but I'm not aware of any. Most of the others are not as tall as these.
Also take note of the following picture:


It shows that you are to use the taller bushing by itself or the shorter bushing with the wedding band spacer. Even without the spacer I think the alignment shop could correct any issues that may present itself, but having the front axle assembly mounted too far back may cause tire rubbing problems and/or reduced positive caster

 

Have you tried a place like Mr. 4x4?
I know of a few places local where you can probably get those parts NOS
An instruction sheet not so much

 

Look at post above. Two Rancho manuals supplied. See links.

I have the Rancho long arm kit on my F150. I had to add about 1/2" of large washers to the bushing stack in place of any missing (or not) wedding band spacers, in addition to the taller bushings because my 33x12.5s would rub the back of the wheel openings ONLY when backing up and turning full lock.
I don't know what was originally on this truck because back in 1994 when I had this done I had an (later known) incompetent shop install the lift, which I have had to correct several issues they didn't do correctly.

Superlift:
https://www.jegs.com/i/Superlift-Sus.../2209/10002/-1

BDS has something that looks similar as far as being a little taller:
https://www.offroadwarehouse.com/pro...-armset-073002


Just a few years ago I installed the Superlift long arm on a FSB and I will tell you that the newer Superlift arms are much more superior to the old Rancho arms in that the Rancho arms are straight tubing and the Superlift are bent to allow tire at lock clearance and the Superlift seem to have a little more caster built into them.
Loss of caster is usually one prominent problem that contributes the most to people complaining about poor handling in a lifted big tired vehicle.

 

Try contacting "vintagetruckand4x4.com" for a lead on proper bushings.

Has anyone looked to see if Dorman or Moog might make the radius arm bushings ?