Lower Control Arm Questions - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Brakes, Suspension, Wheels and Tires > Suspension

Suspension Suspension

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  #1  
Old 01-21-2010, 02:02 PM
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MichEnvoyBoy MichEnvoyBoy is offline
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Lower Control Arm Questions

I replaced the upper control arms and all ball joints last weekend.

I couldnt replace my lowers because I didnt want RockAuto to get cocky with all the money I was spending with them J/k. I was trying to budget wisely.

Anyways, Im going to replace the lower control arm brackets now. Coincidentally, after I replaced all 4 ball joints and upper control arms, the lower control arms are really making noises now...

What is the easiest way to replace the lower control arm brackets? I was thinking of: Jacking Envoy up. Putting on jack stands (on truck frame of course), loosen bolts of the bracket to frame, support lower control arm with jack, then loosen the bolts of the lower control arm bracket to the other part of the lower control arm.

Installation is the reversal?

Or do I need to take the WHOLE lower control arm OFF instead of trying to replace the bracket with it in the truck?

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  #2  
Old 01-21-2010, 02:13 PM
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Are you planning on using a spring compressor to hold the spring when the bracket comes off? If not, I hope your life insurance is paid up. Be very careful. That spring has a lot of stored energy and can kill.
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Old 01-21-2010, 02:22 PM
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Originally Posted by Robert1101 View Post
Are you planning on using a spring compressor to hold the spring when the bracket comes off? If not, I hope your life insurance is paid up. Be very careful. That spring has a lot of stored energy and can kill.
Wait. Are you talking about the coil spring on the shock?

When I replaced my shocks a few years ago, (I did the job myself), the shock assembly itself bolted right in to the strut tower, to the steering knuckle. It didnt have any "pressure", as I bolted it in with no problem, meaning I didnt have to compress the whole assembly to get it back under the fenderwell. I cannot see why the lower control arm would be under any coil pressure... maybe Im missing something here ?
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Old 01-21-2010, 02:52 PM
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Before removing them, scribe an outline of how the current bracket sits on the frame. When you re-assemble everything, try to align the new bracket as best you can. - That will give you some sense of alignment, until you get the beast to a shop with an alignment rack. That bracket basically controls all the camber and castor adjustment on the front end, so placement needs to be as close as possible.

To make things easier, I would suggest popping the lower strut mounting bracket off the knuckle, that will relieve all tension on the lower control arm prior to disassembly. As you found out while replacing the ball joints, the knuckle weights a ton and you'll need to support it with a strap or hook while you perform the work. It is easier to pull the lower control arm off, which only requires removing the bolt from the lower ball joint and stabilizer end link. Other than that, you'll already have any other contact points removed by the time you're ready to pull the bracket.

Damn shame the bushings aren't serviceable on our trucks....what a waste of a perfectly good metal bracket.
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Old 01-21-2010, 03:15 PM
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MichEnvoyBoy MichEnvoyBoy is offline
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Quote:
Originally Posted by ylab View Post
Before removing them, scribe an outline of how the current bracket sits on the frame. When you re-assemble everything, try to align the new bracket as best you can. - That will give you some sense of alignment, until you get the beast to a shop with an alignment rack. That bracket basically controls all the camber and castor adjustment on the front end, so placement needs to be as close as possible.

To make things easier, I would suggest popping the lower strut mounting bracket off the knuckle, that will relieve all tension on the lower control arm prior to disassembly. As you found out while replacing the ball joints, the knuckle weights a ton and you'll need to support it with a strap or hook while you perform the work. It is easier to pull the lower control arm off, which only requires removing the bolt from the lower ball joint and stabilizer end link. Other than that, you'll already have any other contact points removed by the time you're ready to pull the bracket.

Damn shame the bushings aren't serviceable on our trucks....what a waste of a perfectly good metal bracket.
Now THIS is the information I was looking for

How are most people replacing the brackets out there - are you taking the whole lower control arm off? Or leaving the portion attached to the ball joint while doing the job and replacing the bracket?
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  #6  
Old 03-14-2010, 03:52 AM
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Quote:
Originally Posted by MichEnvoyBoy View Post
Now THIS is the information I was looking for

How are most people replacing the brackets out there - are you taking the whole lower control arm off? Or leaving the portion attached to the ball joint while doing the job and replacing the bracket?
I'm getting ready to do the same job. Any lessons learned or tips to make the job easier?
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