It should be noted that only the 67 cars have the traction bar(s). This is because that the mono leaf springs were found to allow terrible wheel hop. The traction bars were an innovative fix that the sister car the Camaro did without. In '68, Pontiac put multi leaf springs on all but the base 1bbl 6 cars. This was better at controlling wheel hop and thus made the traction bars unnecessary.
The Camaro on the other hand, stayed with mono leaf springs on all but their high performance models thru 1969.
