Front Control Arm Design Input - Chevy Impala SS Forum
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post #1 of 35 (permalink) Old 02-23-2004, 05:24 PM
Rustic
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Here is a list of what I hope to accomplish with the tubular front control arm design... please reply if you have other issues that you think need to be addressed in the re-design.

Lower Arms:
Maintain stock geometry.
Maintain stock bushing size.
Beef up shock mount area for use with coil-overs.
2 ball joint options for use with 5/8 or 9/16.

Upper Arms:
Arm will be shortened 5/8" to improve geometry. Can be used with 2" spindle spacer.
3 degrees of toe-down to correct ball joint mounting location.
Will use factory size bushing.
Will fit in factory SS wheel.
0-6 deg camber adjustment feature available on either upper for $70 extra.

Price will be approx $525 for the set of 4.

As mentioned before they will be in ash gray/silver powder coat or $25 extra for your choice of color.
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post #2 of 35 (permalink) Old 02-23-2004, 07:12 PM
AutocroSSer
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Sign me up!
post #3 of 35 (permalink) Old 02-23-2004, 07:35 PM
BAD ROD
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1) What does it mean to design the lower arms for 5/8 inch ball joint?

2) How does the spindle spacer work?

Mike
 
post #4 of 35 (permalink) Old 02-23-2004, 07:48 PM
mexSSican
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Damn...now I gotta spend more money
post #5 of 35 (permalink) Old 02-23-2004, 08:04 PM
AutocroSSer
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Mike : the 5/8" balljoints are the ones for the Cop Car application (late 95 and all 96 9C1). As it is now, to run them you need different lower A-arms (same exact geometry/size as our A-arms, but slightly different balljoint mounting) and spindles (with different taper for the larger lower balljoint).

It is possible to machine spindles that are currently setup for 9/16" balljoints to use the 5/8" balljoints (with the proper tapered machine bit). However once modified, the spindles can't "go back" to using 9/16" balljoints later.

Chris : since not everyone will want the mandatory swap over to 5/8" balljoints to do this, an option the vendor might wanna consider is either :</font>
  • Sell the upper and lower arms separately. This would enable those with 9/16" balljoints to keep their current lower arms, but get the benefits of the better upper arms without requiring a spindle swap/machining operation.</font>
  • Sell 2 versions of the lower arms, identical except for the lower balljoint mounting size (i.e. one set setup for 5/8" balljoints, other set setup for 9/16" balljoints).</font>

The spindle spacer mounts in sort of "series" with the upper balljoint, making the spindle/balljoint combo effectively taller.
post #6 of 35 (permalink) Old 02-23-2004, 08:24 PM
BAD ROD
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Ed, I didn't realize that the 5/8 inch ball joints mounted differently than the 9/16ís to the lower arms.

I like the idea of being able to purchase just the upper arms. It would be a disincentive to those already using custom spindles with 9/16 inch ball joints to have to also upgrade spindles to get the arms to work.

When I changed my ball joints recently, I wondered why you couldn't bolt the upper ball joints under the control arm instead of on top of the control arm. This would give you a little more height (maybe 1/4"?).

If the ball joint spacer works with the stock ball joint. Would the ball joint spacer work with the stock upper arms?

This sounds like a great project!

Mike
post #7 of 35 (permalink) Old 02-23-2004, 11:50 PM
Rustic
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Hey Ed... Thanks for responding to everyones questions.

I agree on the ball joint and will see if we can get 2 versions on the lower arm... one for 9/16 and one for 5/8. I've edited the first post to reflect this.

BadRod:
yes, the spindle spacer will work with the stock upper arm... but the geometry isn't very good. As the outboard end of the arm raises (which is the result of the spacer) the arm needs to get shorter.
post #8 of 35 (permalink) Old 02-24-2004, 12:44 AM
AutocroSSer
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Quote:
Ed, I didn't realize that the 5/8 inch ball joints mounted differently than the 9/16ís to the lower arms.
Actually the mounting "mechanism" is the same. However the hole that you press the balljoint into is a little bigger on the 5/8" balljoints compared to the 9/16" balljoints.

It is possible to modify a 9/16" arm (stock one) to use 5/8" balljoints....Bill Harper has offered this conversion service for a few years now.
post #9 of 35 (permalink) Old 02-24-2004, 02:18 AM
95wagon
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How are these spacers going to attach to the spindles?
I remember seeing some made for earlier "A" and "F" bodies that had a straight bolt going through the upper taper holding a spacer that the taper bolted into.
Looked a little scary.
BadRod questioned mounting the ball joint to the bottom of the upper arm.
While tilting the arm upward, it would have no effect on the roll center as the ball joint pivot and the inner pivot would still be the same height off the ground as stock.
If you are going to go to all the trouble of fabbing up new upper and lower arms I wonder if a guy could go the extra mile and adapt a completely different, taller spindle from something else.
How tall and tough is a C5? Granted the car is a lot lighter
Bill?
Regards, Gerry
post #10 of 35 (permalink) Old 02-24-2004, 08:26 AM
BAD ROD
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Ed, having just changed my lower ball joints, if we could adapt a "bolt on" lower ball joint I could REALLY be excited!

Chris, oh yeah....you canít use a stock arm cause it needs to be shorter too. I'm finally catching on... [img]smile.gif[/img]

Gerry, ahhh I see...the spacer would effectively go between the ball joint and the knuckle, not between the control arm and the ball joint....still catching on... [img]smile.gif[/img]

Guess, I didnít understand this as well as I thought I did!
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