Authors: John Parsons & Spohn Performance

Project Unfair’s Combination 3 & 4 Link Rear Suspension is Powered by Spohn Performance Del-Sphere Pivot Joints

Project Unfair 1969 Camaro Del-Sphere Suspension

Project Unfair 1969 Camaro 3 & 4 Link Suspension Combination

When Art Morrison first approached us with the idea of the transforming combination 3 and 4 link rear suspension for our 1969 Camaro project, we loved the idea. And after I thought about it a bit longer, I called Matt Jones (their suspension engineer) at Morrison and told him to be sure and design the brackets of the new suspension to use Spohn Performance Del-Sphere pivot joints. Matt took some measurements and they were able to accommodate us.

As a result, Spohn Performance’s Del-Sphere pivot joints are all over the rear suspension on Project Unfair, and for good reason. I first used Del-Spheres on my previous Chevy II Nova project (II Much) when the original rod ends started to wear (after a few hundred miles) and started to transmit NVH (noise, vibration, and harshness) into the car. I swapped the rod ends to Del-Spheres and it greatly reduced the NVH, with no loss of accuracy or articulation.

Strictly speaking, the Del-Spheres don’t have quite as much misalignment capability as a rod end, but for rear suspension linkage arms like Unfair’s combination 3 / 4 link, it offers plenty with no loss of strength. The main body of the Del-Sphere is forged chrome moly steel, with a forged ball. The body and ball are separated by Delrin rings, and the body incorporates a rebuildable and grease-able design that allows for the quiet of rubber and the accuracy of steel.

Project Unfair 1969 Camaro 3 & 4 Link Suspension Combination

Project Unfair 1969 Camaro 3 & 4 Link Suspension Combination

We’re confident the car will have excellent handling and ride characteristics, as well as handle the 1200 hp the engine will produce when we put the hammer down!

Project Unfair Del-Sphere Pivot Joints

Here’s the whole rear suspension in what I call “5-link” mode. Note how the Del-Spheres are used on all the control arms except the Watts link.

Project Unfair Rear Suspension with Del-Sphere Joints

This is the road racing setup with a 3 link. For drag racing, the upper control arm in the middle is removed and replaced with two control arms on the side. The Del-Spheres provide the misalignment we need for turning the car on the 3 link setup, and the strength for 1200 hp launches on the 4 link setup.

Del-Sphere Close Up

Here’s a closeup of the Del-Sphere, screwed into one of Unfair’s 4 link upper control arms.

Del-Sphere Unassembled

Taking off the pre-load adjuster shows the Delrin inserts and how they isolate the ball from housing.

Del-Sphere Parts

Here’s a complete disassembly. The forging line in the housing is visible.

For more information on the Spohn Performance Del-Sphere pivot joints read our technical information page. To order Del-Sphere pivot joints for your application visit our online catalog.