home brew mid arm

[Gaius]

Poly Performance makes nice lower control arm mounts. I used them on my recent midarm on my TJ.

I was planning on doing a long arm on the XJ going to the crossmember, but after jow well the TJ came out I might go with a mid arm for that.

 

[builder]

2 " in front and 2.5 in back of leafs. how long of a boomarang did you use?

 

[builder]

and Gaius how long are your lower control arms? and how far does that bracket lower the lca from the frame? what 2.5 inches? thx Ray

 

[Gaius]

My lowers are 26 inches. I'll have to measure the whole mount, but I think the bolt hole is 2 inches below the mount, so 2.5-2.75 sounds right.

 

[builder]

ok thx i am going to about a 20" lower control arm. want to keep it close to factory mount and as far forward as possible and still get the gains from longer arm and i am also going 3 link thx again Ray

 

[xj92]

I used S10 leaves and boomerang shackles on mine (S10 main leaf & all). It rides great, has a good shackle angle, etc. I have the C-Rok rear bumper, so no cutting or modifying was necessary.

 

[Root Moose]

Gaius, did you relocate the UCA for the upper arms at all? If not I guess your setup is pretty similar to the TerFlex long arm kit for XJs.

 

[Gaius]

Not yet, but I'm planning to. I actually took of a Terflex longarm off it (horrible brake dive with stock uppers) to make them. I'm swapping in a 5.9 into it right now.

The fisheye plate you see is to mount the upper link to.

 

[Root Moose]

The fisheye plate you see is to mount the upper link to.

I was wondering about that. You doing any calcs for dive and such or just letting the required clearance put the UCA where it needs to be?

 

[Gaius]

I was wondering about that. You doing any calcs for dive and such or just letting the required clearance put the UCA where it needs to be?

I'm just letting the clearance denote mount placement and building adjustability into the upper mount. If it's not enough I'll raise the lower axle mount.

I did my rear 4-link using basic knowledge of instant center and really let the clearance tell me where the mounts go. Both lower mounts and the axle upper mount really are locked in. Just build adjustability into the upper mount. i try to get one inch past parallel up, and two or three inches past parellel down, if that makes any sense. Here's my 4 link, at about 100% antisquat.

Upper mount:

 

[Goatman]

2 " in front and 2.5 in back of leafs. how long of a boomarang did you use?

I used the 6" long heavy duty shackles that I was already using and made my own boomerang shackles out of them. Basically, I welded tabs on the bottom rear of the shackle, with a triangular brace on top of the tabs, and holes drilled for the spring bolt. Ground the welds flat so you can't tell there's any welding on them. Mine are 2" longer with no problems, you should be fine doing the same thing for 2.5".

 

[builder]

ok thanks a lot Richard,thats what i am going to do.