1929 Ford Model A Suspension Parts Diagram: A Complete Guide

The 1929 Ford Model A is a classic vehicle that many enthusiasts restore and maintain. Understanding its suspension system is key to keeping the car safe and roadworthy. This guide provides a detailed suspension parts diagram for the 1929 Ford Model A, explaining each component’s function and location. Whether you are rebuilding a front axle or replacing rear springs, this information will help you identify and source the correct parts.

Front Suspension Components

The front suspension of the 1929 Model A is a solid axle design with leaf springs and friction shocks. Below is a breakdown of the major parts.

Front Axle Assembly

• Axle Beam: A solid I-beam forging that spans the width of the vehicle. It supports the weight of the front end and provides a mounting point for the springs and steering components.
• Spring Perches: U-shaped brackets welded to the axle beam that hold the ends of the front leaf spring.
• Steering Knuckles: Pivoting assemblies attached to the ends of the axle beam via kingpins. They allow the front wheels to turn.
• Kingpins: Hardened steel pins that connect the steering knuckles to the axle beam. They are often replaceable and require periodic lubrication.
• Wheel Hubs: Mounted on the steering knuckles, they house the wheel bearings and secure the brake drums.

Front Leaf Spring

• Main Leaf: The longest leaf with rolled eyes at each end that attach to the spring perches using shackles and bolts.
• Auxiliary Leaves: Shorter leaves stacked under the main leaf to provide additional load capacity and stiffness.
• Spring Clips (U-bolts): Bolts that clamp the leaf stack together and secure the spring to the axle beam.
• Spring Shackles: Pivoting links at the rear of the front spring that allow the leaf to flex as the axle moves.

Front Shock Absorbers

• Friction Shocks: Original equipment on the 1929 Model A. These are lever-action shocks with friction discs that dampen spring movement. They are mounted on a crossmember and connected to the axle via a link.
• Shock Link: A metal rod connecting the shock arm to the axle.
• Adjusting Nut: Located on top of the shock, used to adjust the damping force by tightening or loosening the friction discs.

Steering Linkage

• Drag Link: Connects the steering gear pitman arm to the steering arm on the left steering knuckle.
• Tie Rod: Connects the two steering knuckles so both wheels turn together.
• Tie Rod Ends: Ball joints at each end of the tie rod that allow movement.

Rear Suspension Components

The rear suspension is similar to the front but uses two longitudinal leaf springs mounted outside the frame rails.

Rear Axle Assembly

• Axle Housing: A forged or cast housing that encases the axle shafts and differential.
• Spring Pads: Flat areas on top of the axle housing where the rear leaf springs sit.
• U-bolts: Long bolts that clamp the leaf springs to the spring pads.
• Radius Rods (Optional): Some later 1929 Model A’s may have radius rods that connect the rear axle to the frame to control fore-aft movement. These are often found on early V8 conversions but were not standard on the Model A.

Rear Leaf Springs

• Two Spring Assemblies: One on each side of the vehicle. Each has a main leaf with eyes at both ends. The front eye bolts to a spring hanger on the frame, and the rear eye attaches to a shackle at the frame crossmember.
• Interleaf Pads: Thin strips of material placed between leaves to reduce friction and prevent squeaks.
• Spring Center Bolt: A bolt through the center of the leaf stack that aligns the leaves and secures the spring to the axle pad.

Rear Shock Absorbers

• Similar friction shocks are used on the rear, mounted on a crossmember near the rear of the frame. They connect to the axle via a link and an arm.

Additional Suspension Parts

Wishbone Link (or Torque Tube)

The 1929 Model A uses a torque tube driveline that connects the transmission to the rear axle. The torque tube acts as a lateral locating device for the rear axle, reducing the need for a separate Panhard rod. In some diagrams, you will see a “wishbone” or “radius rod” assembly that connects the rear axle to the transmission housing. This is part of the suspension because it controls axle windup and lateral movement.

Grease Fittings (Zerk Fittings)

Almost all pivot points in the suspension—kingpins, spring shackles, tie rod ends, drag link—are equipped with grease fittings. Regular lubrication is essential to prevent wear and maintain steering response.

Bump Stops

Rubber or metal bump stops are mounted on the frame or axle to prevent metal-to-metal contact when the suspension bottoms out. On the 1929 Model A, front bump stops are often found on the spring perches, and rear bump stops are on the frame above the axle.

How to Read a Suspension Parts Diagram

A typical diagram will show the car from the side or exploded views of the front and rear suspension. Look for numbered or labeled parts corresponding to a list. Common notations include:

• Part numbers for original Ford or aftermarket replacements.
• Reference letters for assembly steps. When working on your Model A, always consult a reliable parts catalog or diagram specific to your month/year of manufacture, as there were running changes during 1929.

Practical Tips for Restoration

1. Identify All Parts Before Disassembly – Take photos and label every component. It’s easy to mix up small items like shackle bolts.
2. Inspect Leaf Springs for Sagging or Cracks – Springs can weaken over time. Replace them in pairs to maintain ride height.
3. Rebuild the Friction Shocks – Kits are available to replace the friction discs. Proper adjustment is critical for safe handling.
4. Replace Kingpins and Bushings – Worn kingpins cause steering play and uneven tire wear.
5. Use High-Quality Grease – Modern lithium grease works well for most fittings. Avoid grease with extreme pressure additives that may damage bronze bushings.
6. Check the Torque Tube Ball Joint – The torque tube connects to a ball joint at the transmission. Wear here causes driveline vibration and must be addressed.

Common Parts Suppliers

While we don’t endorse specific vendors, many Model A parts suppliers offer complete suspension kits with diagrams. Look for businesses that specialize in Ford Model A parts, as they provide accurate reproductions of original components. Some suppliers also offer upgraded brakes or shocks if you plan to drive the car regularly.

Final Recommendation

For anyone restoring a 1929 Ford Model A, obtaining a detailed suspension parts diagram is an essential first step. It not only helps you understand the original design but also ensures you order the correct replacement parts. Start by studying diagrams from official Ford service bulletins or reputable Model A clubs. Then, work systematically through each component—front springs, shocks, steering, rear springs, and axle. A methodical approach will save time and prevent costly mistakes. Remember that proper lubrication and correct assembly tolerances are more important than simply replacing parts. With careful attention to the diagram and the tips above, your 1929 Model A will ride and handle as it did when new.