As every Drag Racer knows, consistency wins championships. John Calvert has achieved championship status in the highly competitive field of NHRA drag racing. He has 20 plus years of racing experience over every type of track condition imaginable. John has won most of his races in a 1968 Ford 428 cu/in powered Cobra Jet Mustang. He knows the idiosyncrasies and potentials of his car without question; He knows the importance of understanding and fine tuning all the components needed for repeated successful performance. His experience and success over the years with his car provide him with an excellent base line from which to create more efficient modifications. It has in this experimental role that John and his skilled friend Larry Kieser developed the CALTRACS traction enhancement system.

In Stock Class, where John's major racing endeavor has been shaped, NHRA dictates that a maximum of 9" slicks can be used. This presents a racing dilemma to a driver when trying to couple big block power to the ground. The CALTRACS design was developed in John's garage. Brainstorming together, Larry and John created the design and the first model of the system. CALTRACS augments the car and driver potential to specific performance goals while complying with hard set NHRA class parameters.

John's concept won the enthusiastic approval of his family. Two brothers, Keith and Paul and Dad, Bernerd all share a talent and fascination for the world of mechanical engineering. Combined they hold over 75 years of career involvement in Aerospace engineering and production.

 

Mono Leaf Kits	Mono leaf kits for Mopar Ford and GM applications. Most applications $299.00
CalTrac Bar Kits	Starting at $339.00  Most applications
Shocks	Starting at $89.99 each NEW HD Caltrac specific version Most applications
Full Package Deal	Monoleaf Springs-Caltrac Bars-Shocks  $799.00
New U-Bolts	We recommend new U-Bolts Add $$29.95 set of 4

Tremendous benefits can be realized when the CALTRACS traction bar system is installed on a leaf spring suspended automobile. CALTRACS traction bars were developed to achieve specific goals to improve high power traction while staying within hard set NHRA parameters.

Each of the two assemblies needed is comprised of three basic components:

1. Front Pivot

2. Force Transfer Link

3. Rear Mount

The combination of these components changes the pushing point on the car by redirecting the turning action (spring wrap-up) of the rear axle through the Force Transfer Link into the Front Pivot. The Front Pivot Spring Stop Bolt resists this turning motion and also controls the bending of the leaf spring at its thinnest section. The push into the Front Pivot helps the cars weight shift towards the rear of the car because of a new directed angle of force toward the front of the vehicle. (The "Instant Center" moves farther forward). This is where the system emulates a Four link system.
The pinion angle is also maintained. (See illustration)



1. The Front Pivot
Two steel plates sandwich the leaf spring sides. Two attach points in the plates provide the user with a selection in which the forward Force Transfer Link rod end can be located. A machined aluminum spring eye bushing and steel insert supports the front of the spring while allowing the plates to pivot. A spring stop bolt controls and restricts spring wrap-up. Spacers are provided for different vehicle applications that control clearances in the front spring eye pocket.

2. Force Transfer Link
This is a length of chromolly tubing with CNC machined threaded inserts TIG welded into each end. The front Insert is machined with right hand Threads and a HEX outer shape for Simple wrench adjustment of the Installed assembly. The rear insert is Left hand threaded. Opposite thread Styles at each end provide the means to easily lengthen or shorten the link for desired pre-load adjustment.
 

3. Rear Mount
A welded ¼" steel assembly replaces the original vehicles spring perch and incorporates the mounting provisions for the rear rod end of the Force Transfer Link.

CalTracs Split Monoleaf Springs

Calvert Racing, the company who introduced the CalTracs Two-link System is proud to announce our "Split-Leaf Mono" spring, an innovation in leaf spring technology. This revolutionary concept allows you to have the proper spring rate, and desired ride height for your high horsepower racecar or boulevard cruiser. Calvert Racing has provided 2-piece springs used by the last 5 World Champions in Stock Eliminator, now you can own these same proven springs. These are not a replacement spring designed to be used on a totally stock application, but if you have a performance street rod or muscle car you'll be amazed at the ride quality and improved traction of these springs when combined with the CalTrac Bars.  For the latest in Traction Enhancement Systems call us at 541-942-5920

Installing the CALTRACS is very straightforward. Raise and support the car high enough to remove the rear tires. Allow adequate working space. Next, the rear spring assemblies should be removed. This will facilitate replacement of the front eye bushings. Support the rear end housing in place while the springs are out. This will eliminate the need to disconnect the drive shaft, brake lines etc. Press or have pressed, the original front eye bushing out of each spring assembly. Replace these with the machined aluminum CALTRACS bushings supplied in the kit. Now, reinstall the rear springs into the car.

With each spring assembly ready to go in, position the forward pivot assembly to the front spring eye. (Assure that the Spring Stop Bolt is located on the upper surface of the spring.) Install the Steel Bushing through the pivot and front spring eye bushing. Now, reinstall the spring using the original hardware. Repeat the process for the other side.

Lower the rear axle assembly on to the springs. Install the supplied spring perches as you would the stock items being replaced. Attach the shocks.

Now the Force Transfer Link can be installed by starting the HEX (wrenching) end on to the forward rod end. Remove the rear rod end from the spring perch and start its threads into the rear Force Transfer Link. Adjust the assembly to proper length by holding the rear rod end then rotating the Force Transfer Link until the rear rod end will line up with the mounting hole in the rear spring perch. Install the rear rod end fastener and secure.

With the CALTRACS installed and the rear tires reinstalled, lower the car to the ground. As an initial setting, turn the Force Transfer Link until the spring Stop Bolt just contacts the upper surface of the spring, then turn the Force Transfer Link one turn more to establish pre-load. Tighten the Force Transfer Link lock nut. That's it!

PART NO.	DESCRIPTION
1010	68-74 AMX JAVELIN In Stock
1020	68-74 AMX JAVELIN (staggered shocks) In Stock
2100	55-57 CHEVY BELAIR (stock spring location or springs moved to inboard side of frame)
2103	55-57 CHEVY BELAIR (springs moved in pocket kit, inside frame rail)
2200	61-67 CHEVY II
2300	67-69 CAMARO / 68-78 NOVA
2400	70-81 CAMARO
4200	CHRYSLER WITH 20" SPRING (all A-Bodies)  In Stock                                           $339.00
4220	CHRYSLER WITH 22" SPRING  In Stock                                                                     $339.00
6200	60-64 GALAXY (requires removal of lower brace at spring eye)
6300	62-65 FAIRLANE- Requires a special Bushing add $25.00
6400	64-73 MUSTANG  In Stock
6500	66-71 FAIRLANE In Stock
6600	70-75 MAVERICK
6700	70-80 PINTO (needs either: 3" axle tube or 2½" perch width)
	All Non-stock items can usually be shipped from the factory  next day

How Much Power Can You Put to the Ground with Caltracs?

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Page updated 8.26

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