Illustrated Parts Breakdown for 1970 Impala Front Steering and Suspension

If you're restoring or repairing a 1970 Chevrolet Impala, understanding the front steering and suspension system is essential. This article provides an illustrated parts breakdown to help you identify each component, understand its function, and plan your restoration or repair job. From the control arms to the steering linkage, we cover what you need to know.

Front Suspension Components

The 1970 Impala uses a classic double-wishbone independent front suspension. This setup includes upper and lower control arms, coil springs, shock absorbers, and a stabilizer bar. Each part plays a role in ride quality, handling, and safety.

Upper and Lower Control Arms

The upper control arm mounts to the frame and connects to the steering knuckle via a ball joint. The lower control arm is larger and carries the coil spring and shock absorber. Both arms have bushings that wear over time, causing loose steering or clunking noises.

Coil Springs and Shocks

Coil springs sit between the lower control arm and the frame. They support the vehicle's weight and absorb bumps. Shock absorbers dampen spring oscillations. Many restorers upgrade to modern shocks for better ride control.

Stabilizer Bar (Sway Bar)

The stabilizer bar connects the left and right lower control arms to reduce body roll during cornering. It attaches via stabilizer links with bushings that often deteriorate.

Steering Linkage and Components

The steering system transfers your input from the steering wheel to the front wheels. The 1970 Impala uses a recirculating-ball steering gear with a Pitman arm, idler arm, center link, and tie rod ends.

Steering Gearbox

The steering gearbox is mounted to the frame and connects to the steering column. Internal gears convert rotational motion into linear motion. Leaks or excessive play indicate needed rebuild or replacement.

Pitman Arm and Idler Arm

The Pitman arm connects the steering gearbox output shaft to the center link. On the passenger side, the idler arm supports the center link and keeps the linkage parallel. Worn idler arms cause wandering steering.

Center Link and Tie Rods

The center link runs from the Pitman arm to the idler arm. Inner tie rods attach to the center link, and outer tie rods connect to the steering knuckles. Tie rod ends have ball sockets that wear, creating looseness.

Illustrated Parts Diagram Overview

A typical diagram for the 1970 Impala front suspension will show:

• Frame supports and crossmember
• Upper and lower control arms with bushings and ball joints
• Coil spring and shock absorber placement
• Stabilizer bar and links
• Steering gearbox, Pitman arm, idler arm, center link
• Inner and outer tie rods with adjusting sleeves
• Steering knuckle and spindle assembly
• Wheel bearings and seals

Many manuals and online sources provide exploded views with part numbers for accurate ordering.

Common Issues and Replacement Guidance

When sourcing parts, stick to quality brands like Moog, AC Delco, or Rare Parts. Avoid cheap no-name items that may fit poorly. Here are typical repair scenarios:

Ball Joint and Bushing Wear

Original ball joints are riveted. Replacement requires grinding off rivets and bolting in new joints. Control arm bushings can be pressed in, but many restorers buy pre-assembled arms to save time.

Steering Gearbox Slop

Over time, the sector shaft and bearings wear, creating play. Adjust the gearbox preload if possible, but a rebuild or swap to a quick-ratio unit is common for better steering response.

Tie Rod End Replacement

Always replace inner and outer tie rods in pairs. After installation, get a professional alignment to avoid uneven tire wear.

Final Recommendations

For your 1970 Impala restoration, use the illustrated parts breakdown to verify you have all components. Buy suspension and steering kits that include many of the wear items. Before disassembly, photograph the existing setup for reference. Replace all rubber bushings, ball joints, and tie rods for safety. Consider upgrading to modern shocks and a larger stabilizer bar for improved handling. Always torque fasteners to factory specifications. With careful planning and quality parts, you can restore your Impala's front end to like-new performance.