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Old 02-14-2004, 09:27 PM
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boxing in rear control arms "HELP"

what is the reason of boxing in rear control arms? i've got a 85 SS Monte Carlo & i've been told i should box them in but not really sure why i should. should i box in the upper & lower, or just the lower control arms? why box them in at all? a engine i know, but i know nothing about supenion's. thanks

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Old 02-15-2004, 10:34 AM
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Read this for some info... http://www.gnttype.org/techarea/suspension/chassis.html
I did a search on the web under "boxing lower control arms" and found this as 1 of many hits... Try a search...
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Old 02-15-2004, 10:45 AM
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Boxing them helps stop flexing and twisting. Also, you should replace your rubber bushings with poly ones....even less flex.
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Old 02-16-2004, 10:42 PM
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I disagree with welding control arms they are very carfully designed to have just the right characteristics from the factory. Welding on them changes these characteristics
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Old 02-17-2004, 09:27 AM
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All high output cars were boxed from the factory, others were not because they did not have the power to flex them. welding on them will not change the way they ride, just makes them stronger.

If you want a sway bar they will have to be boxed.

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Old 02-17-2004, 04:58 PM
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Welding on any metal changes its characteristics if they are boxed from the factory this has of cource already be taken into account. Its a big no no it weld on suspention parts although i know its done quite frequently.
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Old 02-17-2004, 07:08 PM
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How do you think they box them?......They are welded.
If it's done right, you will not change anything.

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Old 02-19-2004, 08:08 AM
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I agree...you might not want to be welding on springs, since that WILL effect the temper of the spring steel, but as for the other suspension components, there's absolutely no reason to NOT weld on them. They really have no 'characteristics' to damage, and as previously noted, it's how they were done at the factory as well.
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Old 02-19-2004, 08:48 PM
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Well interestingly there is alot more engineering that goes into each suspension component than most people realize. control arms are carefully designed to have enough flexibly so that if they undergo a heavy blow such as striking a curb they will generally bent and absorb the impact instead of crack and breaking. when a piece is welded on it often becomes harder and more brittle.

quote: *suspension components, there's absolutely no reason to NOT weld on them*

don't ever write that on an apprenticeship exam
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Old 02-19-2004, 08:58 PM
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I think you have the control arm mixed up with the springs and sway bars. If you bend a control arm, you had better replace it, because it will not come back. There is no apprenticeship form or exam for building hotrods.

If you bend one on a curb, your going to fast in reverse.

Troy

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Old 02-19-2004, 09:07 PM
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[QUOTE]Originally posted by troy-curt
[B]I think you have the control arm mixed up with the springs and sway bars. If you bend a control arm, you had better replace it, because it will not come back. There is no apprenticeship form or exam for building hotrods.

If you bend one on a curb, your going to fast in reverse.

Troy

I'm talking about mechanic licence cirtification. I realize I am spliting hairs a bit. For very obvious reasons sway bars and springs should never be welded on but idea no suspention pieces should be including tie rods and control arms. As for the comment about "if you bend a control are you better replace it" I'm not sure what you point is
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Old 02-20-2004, 01:55 AM
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quote;
Originally posted by Robison Robin;
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control arms are carefully designed to have enough flexibly so that if they undergo a heavy blow such as striking a curb they will generally bent and absorb the impact instead of crack and break.
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Quote
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the comment about "if you bend a control are you better replace it" I'm not sure what you point is
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They will not bend and absorb an impact. The point is, if you bend one replace it. They are not designed to bend or flex.

If they have had the reinforcement welded on,(that we are posting about) and they get bent, it wouldn't make any difference, because the car would probably be totaled.

Tell me what you think a control arm is.

Troy

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