Oh the memories...traction bars (we called them slapper bars), Keystones, Cragar S/S and dare I say it...Holley 750 double pumpers, manual chokes. Need more fuel? Change the jets, metering block, float level? Remember if the car backfired, you'd be out buying a new accelerator pump? Ya, traction bars are for leaf springs and the days when you could sit on the radiator support and work on the engine, comfortably.
Old school - these were for leaf sprung rear axles. Today's equivalent would be control arms. The idea is the same...to keep the axle from twisting under torque load.
Damn, I feel old now. We did these on our cars in high school - 20 years ago. (They were Mustangs though...mine-1973 Mach 1 351C, and my friends had a 67 fastback (w/351W transplant), a 68 fastback, 70 Boss 302.
Those were the days...!
No no, the 82-02 Camaro/Firebirds (F-body) use the lower control arms and a torque arm.
Lakewood makes a traction bar for them but I never heard good about it. The f-Bodies have lower control relocation brackets which is like a lift bar se t up, changes the geometry of the reat control arm. Take a look....