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Old 01-26-2006, 08:02 PM
3100 Special's Avatar
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Panhard verses diagonal track bar

To set the stage:
54 Chevy panel truck
Complete IFS installed
Ford 9 inch ready to install
TCI 4-link suspension kit w/ coil over shocks received. See here:
http://www.classicperform.com/Store/...s/4754RSKP.htm
Power plant will be a V8 (roughly 450HP to give an idea of the torque being applied)

The 4-link kit was to have come with a pan hard bar. In it's place, I received a diagonal track bar.

I know the difference in how they are installed but, I don't truly know what one over the other will mean to my ride. I'm not looking to take the panel to the strip (often) but...I will play occasionally. Meaning...I WILL put power to the rear every so often.

I've read several posts by a few folks that definitely know their suspensions and cause and effect. Looking for some educated answers.

Thanks in advance!
Jon

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Last edited by 3100 Special; 01-26-2006 at 09:12 PM.
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Old 01-27-2006, 04:55 AM
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I'm certain that, for your purposes, the diagonal bar will do the job. Personally, I prefer a Panhard, but that's only because I'd want to play some "tricks" with the 4link and the diagonal bar imposes some force redundancy which is difficult to analyze.

The best example of "redundancy" is a four-legged table. You really only need three legs, of course. And, knowing the location of a load on a three-legged table, it's easy to calculate the load carried by each leg. A fellow named Castigliani came up with a technique to calculate leg loads with the four-legged table, but the problem becomes much more difficult. (Actually, he was interested in more than tables, but that's beside the point.) Anyway, it's already more difficult to calculate link loads with a 4link than a 3link, so, when you add the diagonal link, it's becoming a little much!

The "tricks" to which I refer would be those which involve an asymmetry in the setup. This provides the opportunity to completely cancel the effects of driveshaft torque, assuring equal loading of the rear tires during launch.
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Old 01-27-2006, 08:06 AM
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It's always been my understanding that a diagonal bar does not provide the suspension movement necessary for a good driving vehicle on the street. A panhard bar will be much better for street use IMHO where the diagonal bar is more suited for the drag strip.
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Old 01-27-2006, 10:25 AM
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Quotes from Art Morrison web site:

http://www.artmorrison.com/techtipstwo.htm

"The diagonal link is designed for racing applications only and works extremely well under those conditions"

"A diagonal link used on the street will fail, it's only a matter of time. The stress caused by the cornering of a street car puts too much bind and tension on the ends of the link and either the clevis or the rod end will fail, you just don't know when"

"For a street use vehicle a Panhard bar is tough to beat."

My 4-link has a diagonal bar and the attachment that is welded to the rear end housing already cracked (not the weld, but the bracket) due to stress and had to be beefed up. If I was doing it again I would go with a panhard bar for the street if there is room to install it.

Dan B.

PS This subject was covered here before (with various opinions too!):

diagonal link 0r panhard!!

Last edited by Dan B; 01-27-2006 at 10:34 AM.
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Old 01-27-2006, 04:17 PM
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Thanks for the replies.

"PS This subject was covered here before (with various opinions too!) "

Apologies to Mr. Dan B for missing that one post. I thought I had read through all of the post prior to posting my question.
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Old 01-27-2006, 05:14 PM
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Hey 3100, no problem. I see you are keeping your Project Journal up-to-date too! Lookin' good!
Dan B.
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Old 01-27-2006, 08:32 PM
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Quote:
Originally Posted by Dan B
Hey 3100, no problem. I see you are keeping your Project Journal up-to-date too! Lookin' good!
Dan B.
Thanks Dan
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