LCA Bracket Reinforcement - JeepForum.com
 
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post #1 of 2 Old 08-26-2008, 09:33 AM Thread Starter
lupinsea
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2001 TJ Wrangler 
 
Join Date: Jun 2004
Location: Kenmore, WA
Posts: 3,581
LCA Bracket Reinforcement

Lower Control Arm Bracket Reinforcing

CONTENTS

1) Vehicle Setup
2) Overview / Performance Review
3) Installation


1) VEHICLE SETUP

No other modifications are necessary to perform this procedure and installation. It will work with stock or modified Jeeps.


2) OVERVIEW / PERFORMANCE REVIEW

Overview:
After 4 years and 50+ offroad outings the control arms and mounting brackets on my Jeep needed repair. The control arms were bent and one smacked by a rock so badly the pressed in bushing came loose. The bracket ears on the frame were dented and crushed to the point they interfered with the control arm movement. All this resulted in wonky and vague handling and disconcerting clanking and creeking noises from the suspension.

Solution:
In addition to replacing the control arms with new(er) used stock control arms, the brackets on the frame were straightened and reinforced with a 1/4" rod shaped to a flange and welded in place. The lower axle brackets were boxed in with a mini-skid plate. This protected the end of the control arm from rocks and greatly strengthened the lower control arm brackets. Total cost for the project has been approximately $20-25 in steel, spray paint, and consumables.

Performance:
While no impact testing has occured I feel confident the reinforcing flanges and mini-skids have significantly beefed up the brackets. In the case of the weld-on flange rod the edge of the frame brackets have tripled in thickness. And by boxing in the axle brackets the chance of the bracket tabs getting knocked askew is virtually eliminated by the skid acting as a shear brace.

Road testing the new arms and straightened brackets has been great. All the clanking and creeking noises have disappeared. The handling and ride has improved as well and it feels like I have a new Jeep again. This exercise has certainly been worth the time and very modest expense.

Leasons Learned:
A few aftermarket companies make pre-bent and pre-cut front axle bracket skid plates for approx $25 tha are ready to weld. For a modest cost these save some hours of measuring, cutting and shaping of the steel. Were I to do this over I would have purchased a set of the pre-made weld-on skids as a time saver. The rear axle bracket skids are easy enough to fabricate out of flat bar stock and take significantly less time to make These I'd definitely recommend fabricating yourself.



3a) INSTALLATION - FRAME BRACKETS

Tools:
Use of a welder, angle grinder are critical for this project. In addition, a pipe wrench made an excellent bracket bending tool. ratchet straps help suck the axle back into place making control arm re-installation easier. A dremel tool is needed for close-quarters grinding and cleaning of the front axle brackets. Beyond these is just basic mechanics tools.

Note:
Remove one control arm at a time. The remaing control arms help keep the axle located.

Preparation:
The process for the frame brackets are the same front and back. Note how damaged and misshapen the frame bracket is (Fig 1). Remove the control arm (Fig 2) and assess the bracket. Using the pipe wrench (Fig 3), place the jaws over the bent bracket ears and re-bend. This is a very controlled way to re-shape the bracket compared to smacking things with a mallet. Also, the control arm bolt was reinserted and snugged down to keep the bracket ears aligned during bending. Note how straight the bracket ears can be reshaped to (Fig 4.). Finally, use the angle grinder to grind off the paint around the welding area as well as de-burring the outer edge and reshaping any lumps.



Fig 1. Front frame bracket was severely bent and distorted along with the control arm which was also replaced.


Fig 2. Remove control arm and ***** bracket


Fig 3. Using special tool #3489, carefully re-bend bracket ears into
original shape. One of the suspension bolts was reinstalled to help keep the ears from spreading during the re-bending process.


Fig 4. The re-straightened bracket.

Flange Fabrication:
With the ears now straightened, hold up a piece of cardboard and trace the outline of the bracket (Fig 5). Using a bench vice and mallet shape a piece of 1/4" steel rod to the profile traced on the cardboard (Fig 6). Once you get the hang of it the shaping process doesn't take much time. Test fit the flange against the bracket (Fig 7). Due to the factory facets in the bracket you'll need to fine tune the flange so it sits flat on all the facets.

Note: Be sure to allow for sufficient clearance around the bolt hold for the bolt and washer/nut.

Lastly, weld the new flange to the bracket by first tack welding it down, then welding both sides of the flange rod (Fig 8). Make sure the flange extends up to the frame and overlaps with the ramped portion of the bracket.



Fig 5. Using an angle grinder, remove the old paint and get down to
bare metal for welding. While at it, grind down any burrs or protrusions.
Then trace the profile of the bracket onto a piece of cardboard for a
template.




Fig 6. Using the template and a precision bending machine, bend the
1/4" steel rod to the shape. Keep the shape of the rod "inside" the outer
edge of the bracket profile you traced.




Fig 7. Test fit the new flange rod. Some tweaking will be required to
ensure the rod fits flat against all the bracket facets.




Fig 8. Weld the flange rod onto the bracket. this tripled the edge thickness of the bracket ears.



Clean-up and Finish:
Using a wire wheel, wire cup thingy, and/or steel brush clean up the weld area for painting (Fig 9). Lastly put on a couple coats of paint for protection (Fig 10). In this case I used an industrial quality Rustoleum, black. After a few runs it'll dirty up again and blend in with the rest of the frame.



Fig 9. With the wire wheel and steel brush hit the bracket to get rid
of any welding residue and clean it for painting.




Fig 10. Spray on a couple coats of good paint to protect the steel
from corrosion and rusting. Don't worry, after a few wheel'n runs the fresh
paint will get dirty and blend in with the rest of the frame.

3b) INSTALLTION - AXLE BRACKET MINI SKID PLATES

Preparation:
Like the frame brackets, re-bend then grind/clean the area to be welded (Fig 11). The use of a dremel tool is invaluable for the front axle brackets as thre are a number of places it's hard to manouver the angle grinder to.



Fig 11. The front axle bracket takes a lot of hits on rocks and can
benefit from having it boxed in with a mini-skid plate. This will help protect
the end of the control arms, too.



Measure:
Carefully measure where to place the front skids. For this project I found the skids run nearly parallel to the front bracket edge but are held out nearly 1" so the end of the control arm will have sufficient clearance. Also, determine where to weld the skids on to. In this instance I welded the new skids to the outer face of the existing bracket. Some scraps of cardboard are useful for making mock-ups, just cut and bend the cardboard to get the desired shape. A 2 ft x 3" piece of flat stock is sufficient to fabricate all four axle brackets.

Cutting and Shaping:

With the necessary measurements I cut and shaped two pieces of 3/16" x 1" x 1" angle iron to form the sides of the mini-skids. With the angle inverted this gave me a flat area to which I could weld the main 3/16" x 3" flat stock piece. A vicegrip clamped the main skid and side angles together to help with a pre-weld test fit.

Welding:
Next the various pieces of the mini-skid were welded together after proper alignment and test fitting. Once the skid was ready it was welded to the axle brackets (Fig 12).



Fig 12. The mini-skids after welding the pieces together. Ready to
weld to the axle bracket



Clean-up and Finish:
Lastly, the final cleaning and painting put the final touches on this project (Fig 13).



Fig 13. The new skids welded to the front axle brackets and painted.



Rear Brackets:
The rear brackets are much simpler to make since there are no side-skirts needed for control arm clearance. (Fig 14)


Fig 14. The rear axle brackets were much more straightforward to
fabricate. Just bend the end of a 3" wide plate and notch at the bend for it to fit between the bracket ears.
__________________
- Jay



Muddy TJ Owner

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post #2 of 2 Old 11-28-2008, 09:02 AM
psychoworks
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1993 ZJ 
 
Join Date: Oct 2008
Location: Kingston, Pa.
Posts: 257
Interesting idea with the round bar to strengthen the brackets. The only problem is, you should have extended them all the way to the top of the bracket and into the frame.

The weakest spot is now the horizontal section where the rod ends and the factory bracket is welded to the frame. Eventually it's either going to bend or break there parallel with the frame.

I shop in the salvage yard!
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