[Michael Farich]

A couple years ago, Dillon and I each upgraded our big cars with 1.125" diameter front anti-sway bars from '76 Bonne 455 cars and 0.750" rear anti-sway bars, from a '75 Cat and one from some big Buick donor cars.
Today in the local U-Pull, got a rear anti-sway bar from a '75 Riv 455 car that appears to be 0.875" diameter which is a little larger than the ones we have. Also, the Riv donated a pair of frame tie-together braces. These are like those on '70-'72 Chevelle BBC cars. On one end they connect to the bolt that fastens the end of the lower trailing arm to the frame. On the other end, they tie to the frame near where the upper trailing arm bolts to it. The intent of these bars is to form a triangle from the lower trailing arm frame attachment, to the point where the main part of the frame meets the crossmember that the upper trailing arms bolt to, to the point where the upper trailing arms actually attach. They take out some of the sponginess of the frame that would otherwise exist and also help prevent cracking of the frame crossmember above the rear end. They might also reduce wheel-hop by making the whole rear suspension a little more rigid.

The optimal setup now seems to be:
Front 1.125" antisway from '76 Bonne 455 car.
Rear 0.875" antisway from '75 Riv 455 car.
Rear frame stiffeners from '75 Riv 455 car.

Mike (73 Cat daily driver - 350k miles)

[Michael Farich]

A couple years ago, Dillon and I each upgraded our big cars with 1.125" diameter front anti-sway bars from '76 Bonne 455 cars and 0.750" rear anti-sway bars, from a '75 Cat and one from some big Buick donor cars.
Today in the local U-Pull, got a rear anti-sway bar from a '75 Riv 455 car that appears to be 0.875" diameter which is a little larger than the ones we have. Also, the Riv donated a pair of frame tie-together braces. These are like those on '70-'72 Chevelle BBC cars. On one end they connect to the bolt that fastens the end of the lower trailing arm to the frame. On the other end, they tie to the frame near where the upper trailing arm bolts to it. The intent of these bars is to form a triangle from the lower trailing arm frame attachment, to the point where the main part of the frame meets the crossmember that the upper trailing arms bolt to, to the point where the upper trailing arms actually attach. They take out some of the sponginess of the frame that would otherwise exist and also help prevent cracking of the frame crossmember above the rear end. They might also reduce wheel-hop by making the whole rear suspension a little more rigid.

The optimal setup now seems to be:
Front 1.125" antisway from '76 Bonne 455 car.
Rear 0.875" antisway from '75 Riv 455 car.
Rear frame stiffeners from '75 Riv 455 car.

Mike (73 Cat daily driver - 350k miles)