Cal Trac Bars - Team Camaro Tech
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post #1 of 8 (permalink) Old Mar 20th, 09, 07:33 PM Thread Starter
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Cal Trac Bars

I have been running Cal Trac bars on my 69 (Z10) for years , my car has a 427 in it putting out 500 hp & 500 TQ the other day I took a buddy for a ride I nailed it grab 2nd gear & hear something pop. I looked around and could not find anything until today. I was detailing the under carriage & noticed the bottom short leaf on driver side was moved forward about a 1 inch. In the past (it happened twice) I have scheard off the bolt that holes the springs together no doubt it happen again. Has anyone had this happen to there car?

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post #2 of 8 (permalink) Old Mar 21st, 09, 05:37 AM
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Re: Cal Trac Bars

Are you using the rubber pads on the spring preaches? If so I would go to alluminum spacer and use 1/2 U blots also.
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post #3 of 8 (permalink) Old Mar 21st, 09, 09:38 PM Thread Starter
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Re: Cal Trac Bars

I have a 1/2 inch aluimium plate no rubber pad.

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post #4 of 8 (permalink) Old Mar 22nd, 09, 04:59 AM
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Re: Cal Trac Bars

Since this has happened a few times now... I would have to ask what is the spring bolt type and what it's torqued to, I would also ask what the U-bolts are torqued to ?

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post #5 of 8 (permalink) Old Mar 22nd, 09, 02:35 PM
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Re: Cal Trac Bars

Good Grade-8 shouldn't pop.

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post #6 of 8 (permalink) Old Mar 23rd, 09, 12:20 PM
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Re: Cal Trac Bars

A bit confused. You keep shearing the 5/16" bolt that holds the leaf spring pack together? Which I guess means the axle tube(s) is moving around on top of the leaf spring? Seems the Cal-Tracs would prevent this, not cause it.

Yes, agree, tighten everything up. Also, do you you have one U-bolt per side as the factory provided? Or have you upgraded to two? Two per side would help stabilize your rear on blast off.
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post #7 of 8 (permalink) Old Mar 23rd, 09, 03:44 PM
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Re: Cal Trac Bars

Very interesting - I welded in a Steel Plate and drilled in a hole to centre my springs. I've been concerned that I might do the same thing which is happening to your ride or possibly brake my lower leaf but hasn't happened (70Z). Also my ride height varies with the amount of torque I apply to the U-Bolts which I contribute to the Spring Curvature sitting on the flat surface of the steel perch. I would not think the torque of the bolts should cause this but axle wind up might if the pinion angle was off. Perhaps you should check your pinion angle and if necessary tapper your aluminum perches.

I'm presently not running Cal-Tracs but I plan to make a set of my own.

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Last edited by Z15CAM; Mar 23rd, 09 at 03:55 PM.
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post #8 of 8 (permalink) Old Mar 23rd, 09, 06:10 PM Thread Starter
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Re: Cal Trac Bars

My axle tubes are welded solid Also I have welded 3/16" x 1 1/4" x 3" plate gussets to both sides of spring perch see pics.


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