1970 Impala Front Suspension Parts Diagram: A Complete Guide

The 1970 Chevrolet Impala is a classic full-size car known for its smooth ride and distinctive styling. Restoring or repairing the front suspension is a common task for enthusiasts. This guide breaks down the 1970 Impala front suspension parts diagram, explains each component, and offers practical advice for maintenance and replacement.

Understanding the 1970 Impala Front Suspension Design

The 1970 Impala uses a traditional independent front suspension with coil springs and control arms. This system was Chevrolet’s standard for full-size cars until the mid-70s. The key components are:

• Upper and lower control arms
• Coil springs
• Shock absorbers
• Steering knuckle (spindle)
• Ball joints
• Sway bar (stabilizer bar)
• Tie rods
• Idler arm and pitman arm
• Control arm bushings
• Spring seats and insulators

Upper and Lower Control Arms

The upper control arm connects the frame to the steering knuckle at the top. It pivots on bushings. The lower control arm is larger and supports the coil spring. Both arms have ball joints that allow steering and suspension movement.

Coil Springs

The coil spring sits between the lower control arm and the frame. It supports the vehicle’s weight and absorbs bumps. Over time, springs can sag, causing a lower ride height and poor handling. Replacement springs are available in standard and heavy-duty ratings.

Shock Absorbers

Shocks dampen spring oscillation. The 1970 Impala uses dual-acting shocks. Worn shocks cause bouncing and reduced control. Replace in pairs.

Steering Knuckle

The steering knuckle (spindle) connects the upper and lower ball joints and holds the wheel hub. It also attaches to the tie rod for steering. Inspect for cracks or wear.

Ball Joints

Two ball joints per side: upper and lower. They allow the steering knuckle to pivot. Worn ball joints cause clunking noises and imprecise steering. Replace if there is play.

Sway Bar

The sway bar (stabilizer bar) connects both lower control arms to reduce body roll. It attaches via links and bushings. Sway bar bushings dry out and crack; replace them to restore handling.

Tie Rods

Inner and outer tie rods connect the steering rack (or steering gear) to the steering knuckle. They adjust toe alignment. Loose tie rods cause wandering and tire wear.

Idler Arm and Pitman Arm

On the 1970 Impala (which uses a recirculating ball steering box), the pitman arm connects the steering box to the center link. The idler arm supports the opposite end of the center link. Both wear out and cause steering looseness.

Control Arm Bushings

Bushings are the rubber or polyurethane pivots for the control arms. Worn bushings allow the arms to move, causing alignment changes and sloppy ride. Polyurethane bushings are stiffer and last longer than rubber.

Spring Seats and Insulators

Rubber insulators sit between the coil spring and the control arm or frame. They prevent noise and corrosion. Replace when replacing springs.

Common Front Suspension Issues in 1970 Impala

• Sagging springs: rear sags first, but front can too. Measure ride height.
• Worn ball joints: check for grease fitting damage and play.
• Deteriorated bushings: cause creaks and vibrations.
• Leaking shocks: oil on the shock body indicates failure.
• Loose tie rods or idler arm: steering wheel play.

How to Read the Diagram (Text Description)

A typical 1970 Impala front suspension parts diagram shows the passenger side assembly in exploded view. From top: frame bracket, upper control arm with two bushings and a ball joint, then coil spring seated on the lower control arm. The lower control arm attaches to the frame at two points (front and rear) with bushings. The steering knuckle is in the center, connected to upper and lower ball joints. The tie rod attaches to the knuckle at the steering arm. The sway bar runs across, connected to the lower control arm through links. The shock absorber is mounted between the lower control arm and the frame.

Replacement Parts and Buying Guidance

When sourcing parts:

• OEM vs Aftermarket: Many aftermarket brands (Moog, AC Delco, Raybestos) make quality parts. For a restoration, consider OEM-style rubber bushings. For performance, use polyurethane.
• Kits: Complete front end kits include all wear items (ball joints, tie rods, bushings, sometimes springs). This is cost-effective.
• Springs: Get the correct spring rate. Standard for 350/400 engines is fine. Heavy duty for big blocks or air conditioning.
• Sway bar links: Usually sold separately. Check if you need the old-style bolt-through or newer design.

Step-by-Step Replacement Overview

1. Safety: Support the frame with jack stands. Never rely on a floor jack.
2. Remove wheel and tire.
3. Remove shock absorber: top and bottom bolts.
4. Disconnect sway bar link.
5. Remove brake caliper and rotor (optional if not interfering).
6. Separate ball joints: Use a pickle fork or ball joint press.
7. Remove upper and lower control arms after noting bolt positions.
8. Replace springs with a spring compressor for safety.
9. Install new bushings, ball joints, and reassemble in reverse.
10. Get a professional alignment after any suspension work.

Final Recommendation

For a 1970 Impala front suspension restoration, buy a complete front end kit from a reputable brand like Moog or AC Delco. It ensures all wear parts are new and compatible. If the car is a daily driver, stick with rubber bushings for a smooth ride. For a weekend cruiser or show car, polyurethane bushings improve handling. Always replace springs in pairs (front set) and use a spring compressor. After the job, alignment is mandatory. A well-maintained 1970 Impala front suspension provides a safe, comfortable ride and preserves the classic feel.