Rear axle

[Jon Mello]

Here's an article from 1968 showing one method of how they beefed up rear spring perches on the axle back then.
No matter if you're road racing or drag racing, this is a wise thing to do because the factory welds in this area are
only suitable for going back and forth to the grocery store.

[Jon Mello]

Chevrolet Engineering was well aware of the limits of their rear axle spring perches in performance applications.
Below is the Engineering Service Letter which shows what they recommended as a fix. Always use u-bolts to
help keep the axle firmly attached to the spring, preferably two per side on a race car. Increasing the diameter
of the u-bolts is a good idea too.

[Jon Mello]

These pictures came to me courtesy of Warren Malkin, Jr. These NOS rear spring perches are from the Frank Profeta, Jr Collection. These are what you would use to convert a full-size Impala rear axle housing for use in the '70 Camaro chassis. The Impalas used coil springs and, thus, needed to be modified. The '70 Camaro's rear leaf springs were perpendicular to the axle housing and did not have the slight inward-leaning angle in front like the 1st-gen Camaros did. These spring perches had the straight alignment needed for the '70 application.