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Old 06-18-2013, 07:16 PM
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Panhard bar, leaf springs and Caltracs??

Hey everyone,

I would like to know your thoughts on this...

I have a 58 Chevy PU, Volare front end, GM 12 bolt with Posi and Cal-Trac's Leaf springs with steel bushings. Rear tires are 275/60-15 Nitto Drag Radials at 25psi

Around corners or during transitions the rear end seems to wobble quite a bit, This could be due to sidewall flex or needing a Panhard bar? Its really a straight line truck and have no desire to turn it into a road race deal. Just curious what makes it necessary to need a panhard bar?

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Old 06-18-2013, 08:57 PM
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I would say it's the rear tires that are doing it unless something else is really out of wack. Panhard bars were meant for leaf spring suspensions. A watts link could be used on a leaf spring suspension for better control but is really overkill on a street car.

Are you using the factory leaf packs or their twin mono springs?

I've heard that the cal-tracs are a nice option versus the old style traction bars. A cheap trick for getting stock springs to hook is clamping the pack in several places in front of the axle. This worked like a champ running 8" slicks on my 55 Chevy.
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Old 06-18-2013, 09:01 PM
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Generally you will not need the panhard with leaf springs..You can check the spring shackles and attachments for any play as under hard cornering there might be some movement that shows up under stress..Other wise it may be sidewall flex..Could be the way the truck is set up you are running what we call a loose setup..

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Old 06-18-2013, 10:09 PM
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If you have leaf springs, You shouldn't need a panhard bar,, I would say it's your tires sidewall giving in a turn...
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Old 06-18-2013, 11:09 PM
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Thanks for the info everyone, hearing the term Trac bar or Pan-hard bar 20 times during a NASCAR race has me thinking LOL

I'm actually more used to front wheel and all wheel drive imports, so its not really an issue. My other truck, a 77 chevy PU with a stock 350 dosent really need a bar
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Old 06-19-2013, 01:23 AM
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your problem = drag radial. soft sidewall
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