Exploded Parts Breakdown for 1970 Impala Front Steering and Suspension

Understanding the exploded parts breakdown for the 1970 Impala front steering and suspension is essential for anyone restoring or repairing this classic Chevrolet. The front end consists of the steering linkage, control arms, springs, shocks, and related hardware. Each component must be correctly identified and assembled to ensure safe handling and proper alignment. This guide provides a detailed breakdown of every part, grouped by system, along with practical tips for sourcing and installation.

Steering Linkage Components

The steering system transmits driver input to the front wheels. On a 1970 Impala, it uses a recirculating-ball steering gear with a pitman arm, idler arm, center link, and tie rods.

Pitman Arm

The pitman arm connects the steering gear output shaft to the center link. It is splined to the sector shaft and secured with a large nut. Over time, the splines can wear, causing steering slop. When replacing, ensure the arm matches the steering gear (manual or power steering).

Idler Arm

The idler arm supports the passenger side of the center link. It attaches to the frame and allows the center link to pivot. A worn idler arm causes vague steering and uneven tire wear. Replacement requires a frame bracket and a new idler arm assembly.

Center Link (Drag Link)

The center link spans between the pitman arm and idler arm, transferring motion to the steering knuckles via tie rods. It is a one-piece forged rod with tapered holes for the tie rod ends. Inspect for bends or cracks.

Tie Rods

Two tie rods connect the center link to the steering knuckles. Each tie rod consists of an inner and outer end with an adjustable sleeve for toe alignment. The 1970 Impala uses separate inner and outer tie rod ends, threaded onto the sleeve. Replace both sides if the steering feels loose.

Steering Damper (Optional)

Some Impalas were equipped with a steering damper, mounted between the center link and frame. It reduces shimmy and vibration. If missing, consider adding one for improved control.

Front Suspension Components

The 1970 Impala features an independent front suspension with upper and lower control arms, coil springs, and shock absorbers. The exploded view includes the frame pivot points, bushings, and ball joints.

Upper Control Arm

The upper control arm (UCA) pivots on a shaft attached to the frame. It houses the upper ball joint and controls camber and caster. The exploded breakdown shows the arm, shaft, bushings, and ball joint. Factory UCA shafts are threaded for adjustment shims.

Lower Control Arm

The lower control arm (LCA) is the main load-bearing member, with a pivot at the frame and a ball joint at the knuckle. The coil spring seats on the LCA. Replace LCA bushings and ball joints as a set.

Coil Springs

Front coil springs provide ride height and absorb road impacts. They are captured between the lower control arm and the frame. Springs are rated by diameter and number of coils. For a 1970 Impala, replace both springs simultaneously to maintain level stance.

Shock Absorbers

Twin-tube hydraulic shocks mount between the lower control arm and the frame. They dampen spring oscillations. Choose gas-charged shocks for better handling. The upper shock mount uses a stud and grommet; the lower uses a bolt and bushing.

Sway Bar (Stabilizer Bar)

The front sway bar connects both lower control arms to reduce body roll. It attaches via end links with bushings. The bar itself mounts to the frame with rubber bushings. A cracked or missing sway bar degrades cornering stability.

Ball Joints

Each control arm has a ball joint that allows the steering knuckle to pivot. Upper and lower ball joints are different sizes. The lower ball joint is load-bearing; the upper is not. Inspect for torn boots or excessive play. Replace in pairs.

Control Arm Bushings

Both upper and lower control arms pivot on rubber or polyurethane bushings. Worn bushings cause noise and wheel alignment issues. The exploded view shows the bushing, sleeve, and retaining hardware. Use polyurethane for better durability.

Steering Knuckle and Hub Assembly

The steering knuckle connects the suspension to the wheel. On a 1970 Impala, it is a cast iron spindle with integral steering arm. The hub rides on tapered roller bearings.

Steering Knuckle (Spindle)

The knuckle has tapered holes for the ball joints and a steering arm for the tie rod. It also holds the brake caliper bracket. Inspect for cracks or wear at the ball joint seats.

Wheel Bearings

Inner and outer bearings support the hub. The 1970 Impala uses sealed or serviceable bearings. Replace bearings and races whenever the hub is removed. Pack bearings with high-temperature grease.

Hub and Rotor Assembly

The brake rotor mounts to the hub, which is pressed together. Some aftermarket options combine the hub and rotor. Ensure correct bolt pattern: 5 on 4.75 inches.

Practical Guidance for Sourcing Parts

When rebuilding the front steering and suspension, use a factory service manual for torque specifications. Many parts are available from classic Chevrolet suppliers. Look for moog, ac delco, or oem replacements. Avoid mixing old and new components – replace bushings, ball joints, and tie rod ends together. Always align the car after component replacement.

Final Recommendation

For a complete exploded parts breakdown, consult the 1970 Chevrolet Impala Factory Service Manual or a parts catalog from a trusted classic car supplier. A systematic approach: begin with the steering linkage, then suspension, then knuckle and hubs. Replace all wear items at once to avoid recurring issues. Invest in quality parts for longevity and safety.

By understanding each component’s role and placement, you can confidently tackle a front-end restoration. The exploded view is your map – use it to identify, order, and install the correct parts for your 1970 Impala.