truck arm rear suspension? - Chevy Impala SS Forum
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post #1 of 5 (permalink) Old 04-14-2004, 08:45 AM
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This 'old' mod seems to be gaining popularity again with 4 arm coil spring cars like ours,..
any opinions as to whether this would work on a b-body? In the tests done it really seems to increase the traction in hard turns, something that Autocrosser points out is a failing point with our cars, would spindle extensions, and long arms in the back dramatically improve the cars handling? BILL? ED?? WAYNE?
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post #2 of 5 (permalink) Old 04-14-2004, 09:09 AM
Navy Lifer
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There are certainly some significant benefits from a "truck arm" design. The name itself defines the problem--trucks have alot more room in the underbody area to fit the system. Unless there are no concerns about what impact there is to the floor pan, thus the interior of the car, the cost of a completely redesigned exhaust system, and other complexities and complications that I am only guessing at, you have to decide if it is worth THAT much to "improve" SOME of the dynamics of the vehicle.

I have to guess that there are probably other means of optimizing the existing suspension setup that would cost far less and have much less impact on the rest of the car, and still give you 95% or more of the improvement that the truck arm setup would give.
post #3 of 5 (permalink) Old 04-14-2004, 01:15 PM
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Some previous discussion can be found at the thread linked below. In that thread there is also a link to a business that adapts truck arm setups to all sorts of cars.;f=16;t=003021
post #4 of 5 (permalink) Old 04-14-2004, 07:02 PM
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i looked at the other thread and the pics, bill would the bars have to be a dead straight shot to the cross member? could they be scissored slighlty to give floor pan clearance,.(as in the old lakewood ladder bars?)
bill, [img]graemlins/5.gif[/img] you ever get the rear disc thing sorted out? I tried e-mailing you but no reply, do you have a different e-mail addy?
post #5 of 5 (permalink) Old 04-14-2004, 10:22 PM
Navy Lifer
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The truck-arm design has the 2 arms angling in to a central location (I assume this is what you mean by scissoring), even if they don't actually join together. I think the idea is that their trajectory leads to a point where the front pivot of the arms is essentially the same as the front U-joint. Thing is, in the longer wheelbase trucks that used this rear suspension, I'd guess the driveshafts were 2-piece, and the front half of the shaft didn't move anyway. The 2 arms are basically a double torque arm setup. The motion of the rear axle with the pivot point so far away is very "gentle" as a result. No idea about spring or shock tuning, but it does seem to me there might be a little more unsprung weight overall--though I could be wrong. The other thing I can't figure is how the pinion angle is managed--in other words, with the axle motion that occurs, what is the extent of angle change seen at each end of the DS, and is it in the acceptable range for a "high-speed" DS?

My new e-mail is [email protected], which you can link to on any forum post I make.

Yes, I have the parts available for the C5 rear brake setup.
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