Cal Trac Bar Installation In Harris
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FAQ
Ideally, both driveshaft-operating angles will be 1 to 3 degrees. Anything over 3 degrees at the rear axle will shorten your universal joint's life and could create vibration. If your angle is larger than 3 degrees, you must make sure not to exceed the max driveshaft RPM as shown on this Spicer table.
Pinion angle is the key. Once you have the traction bars installed you'll want you pinion angle to be negative 2.5 to negative 3-5 degrees.
Most driveline companies recommend operating angles of 3° or less for maximum u-joint life. There should be a minimum of ½° to allow the needles to rotate. The higher the operating angle, the more likely your vehicle will develop a vibration at high driveshaft speeds.
We suggest a pinion angle to be between -2 to -4 degrees when used with CalTracs.
Bolt-On Traction: Installing Traction Bars Thread nuts onto the J-bolts and trial fit them to the axlehousing. Attach the traction bar to the differential housing. the rubber snubber and lift the differential housing until the weight of the car is on the leaf springs.
The pivot at the front leaf eyelet then forces the pin riding on top of the springs downward into the spring pack itself. This downward force of the pin on the leaf springs causes down force on the entire axle assembly and pushes your tires down onto the pavement/dirt.
Either way, you are ultimately looking for pinion angles of 1-2 degrees above the drive shaft angle in the front and 1-2 below drive shaft angle in the back. Theoretically zero is perfect, but the offset allows for axle wrap (twist) under power.
By cleverly controlling the position of the rear axle, traction bars significantly reduce the bounce, keeping the rear suspension from excessive movement. This results in a smoother, safer, and more controlled ride, improving the driving experience substantially.
To get started, bolt on the axle brackets. THey bolt on around the tube just inside the leaf springs. The bar is then slid into the bracket with the angel side up for maximum ground clearance. Next, the swing shackle and snubber and get a rough idea where it will land on the frame.
