What a suspension kit includes for your 1958 Cadillac
A front and rear suspension kit for a 1958 Cadillac Sedan DeVille is a matched set of components designed to replace the worn or original suspension system all at once, rather than replacing parts one at a time. The front kit typically includes upper and lower control arms, ball joints, bushings, and sometimes coil springs or spring hardware. The rear kit usually contains leaf springs (or coil springs on some models), shocks, and related mounting brackets and bushings.
The reason to buy a kit rather than individual parts is consistency: all the pieces are engineered to work together, and you avoid mixing old and new components that may not align properly. A kit also saves you from having to source each part separately and figure out which versions fit your specific year and body style.
The 1958 Sedan DeVille is a full-size luxury car with a long wheelbase, so suspension kits for this model are not interchangeable with smaller Cadillacs or other makes. You will need to confirm the kit is built specifically for 1958 Cadillac, and ideally for the Sedan DeVille body style.
Key Takeaways
- A suspension kit bundles front and rear components together so they work as a matched system, avoiding the guesswork of buying parts separately.
- The 1958 Sedan DeVille requires kits built for that exact year and model; suspension parts from other years or Cadillac body styles will not fit correctly.
- Front kits typically include control arms, ball joints, and bushings; rear kits include springs, shocks, and mounting hardware.
- Kits are available in different quality levels, from basic restoration-grade to performance-oriented, depending on your budget and how you plan to drive the car.
- Installation requires alignment and often professional help, since suspension work affects how the car handles and wears its tires.
Where to find kits made for 1958 Cadillac Sedan DeVille
Specialty suppliers that focus on 1950s Cadillacs carry suspension kits for the Sedan DeVille. The most common sources are classic car restoration suppliers like Eastwood, Ames Performance Engineering, and Cadillac-specific vendors. These companies maintain inventory or can order kits built to original specifications or modern performance standards.
Online marketplaces like eBay and Craigslist sometimes list used or NOS (new old stock) suspension kits, though you will need to verify the kit matches your exact model year and body style before purchasing. Local classic car shops and Cadillac clubs can also point you toward suppliers they have worked with.
Before ordering, confirm the kit description lists "1958 Cadillac Sedan DeVille" explicitly. Kits labeled only "1958 Cadillac" or "1957–1959 Cadillac" may not account for the Sedan DeVille's specific wheelbase and weight distribution.
Restoration-grade versus performance-oriented kits
A restoration-grade kit is built to match the original suspension as closely as possible. It uses components that look and function like the factory parts, so the car handles and rides the way a 1958 Sedan DeVille did when new. These kits are the choice if you want the car to feel authentic and you plan to drive it at modest speeds on good roads.
A performance-oriented kit upgrades the suspension to handle better by stiffening springs, using modern shock absorbers, and sometimes lowering the ride height slightly. These kits are built for people who want the car to corner flatter and stop shorter, even though it will ride firmer and may not look exactly original. Performance kits often cost more and may require additional modifications to the brake system or steering.
Most 1958 Sedan DeVille owners choose restoration-grade kits because the car's size and weight make aggressive handling modifications less practical. However, if you plan to drive the car regularly on modern highways, a kit with upgraded shocks and bushings (but original-height springs) is a middle ground that improves safety without changing the car's appearance.
What installation typically involves
Installing a suspension kit requires lifting the car safely, removing the old suspension components, and bolting in the new ones. For the front, this means removing the wheels, disconnecting the steering linkage, unbolting the control arms, and installing the new arms with fresh ball joints and bushings. The rear work involves removing the wheels, unbolting the leaf springs or coil springs, and installing the new springs and shock absorbers.
After installation, the car must be aligned. A wheel alignment adjusts the angle of the wheels so they track straight and wear evenly. The 1958 Sedan DeVille has adjustable front suspension geometry, so alignment is essential and should be done by a shop with alignment equipment designed for classic cars, since modern alignment racks may not accommodate the car's wide stance and long wheelbase.
Most people have this work done by a shop because suspension work requires special tools, a safe lift, and knowledge of the specific car. A shop experienced with 1950s Cadillacs will know the common pitfalls — for example, which bolts need threadlocker, how to avoid damaging the original trim, and whether the kit requires any modifications to the frame or steering components.
Cost range and what affects the price
A complete front and rear suspension kit for a 1958 Sedan DeVille ranges widely depending on quality and source. A basic restoration-grade kit from a specialty supplier typically costs between $800 and $1,500 for the parts alone. Performance-oriented kits or kits with upgraded components can run $1,500 to $2,500 or more.
Installation labor adds significantly to the total. A shop will typically charge $1,500 to $3,000 or more for the full job, depending on the condition of the existing suspension (if bolts are seized or rusted, removal takes longer) and whether any frame repair is needed. Alignment adds another $150 to $300.
The total cost of a complete suspension overhaul — kit plus installation plus alignment — usually falls between $2,500 and $5,500. Buying used or NOS parts can lower the parts cost, but you risk getting components that are worn or incomplete, so this route works best if you have experience evaluating suspension parts or know a mechanic who can inspect them for you.
Common issues to watch for during installation
One frequent problem is that new bushings and ball joints may not fit perfectly into original mounting points if the frame has shifted or rusted over the decades. A good shop will check for this before ordering the kit and may need to do minor frame straightening or drilling to make everything line up.
Another issue is that some kits include springs that are slightly stiffer or softer than original, which changes how the car sits. If the ride height is off, the steering geometry changes and the car may pull to one side or wear tires unevenly. This is why alignment after installation is not optional — it is essential to get the geometry back to spec.
Mixing old and new components can also cause problems. For example, if you install a new front kit but keep the original rear springs, the car may handle unevenly or the brakes may not work as designed. This is why a matched kit is better than piecemeal replacement.
How to verify the kit fits your specific car
Before ordering, gather your car's VIN (vehicle identification number) and note the body style — Sedan DeVille, not just "Cadillac" or "1958." The VIN is stamped on the driver's side door jamb or on a plate under the hood. The body style is usually printed on the door jamb as well.
Contact the kit supplier with this information and ask them to confirm the kit is correct for your car. A reputable supplier will ask these questions before you order. If a supplier says "it fits all 1958 Cadillacs," that is a red flag — the Sedan DeVille has different suspension geometry than the Eldorado or Coupe de Ville.
If you are buying used or from a private seller, ask for photos of the kit components and the original packaging or documentation. Suspension parts are not returnable once installed, so verifying the fit before you buy is important.
Frequently Asked Questions
Can I install a suspension kit myself if I have basic mechanical skills?
Suspension work requires a safe lift, alignment equipment, and knowledge of torque specifications and suspension geometry. If you have done brake work or replaced shocks before, you have some of the skills, but a full kit installation is more complex. Most people have this done by a shop to avoid safety issues and may support the alignment is correct.
Will a new suspension kit make my 1958 Cadillac handle like a modern car?
No. A restoration-grade kit will make the car handle better than worn original suspension, but a 1958 Sedan DeVille is still a large, heavy car with a long wheelbase. Even with a performance kit, it will not corner or stop like a modern sedan. The improvement is in safety and predictability, not in sports-car handling.
Do I need to replace the steering components at the same time?
Not always, but the steering linkage is connected to the front suspension, so a shop will inspect it during installation. If the tie rods or steering box are worn, replacing them while the front suspension is apart is more efficient than doing it later. Ask the shop for their assessment before work begins.
What is the difference between leaf springs and coil springs on a 1958 Cadillac?
The 1958 Sedan DeVille came with leaf springs in the rear. Some aftermarket kits offer coil spring conversions, which ride smoother and take up less space, but they change the car's appearance and may require modifications to the frame. Most restoration kits stick with leaf springs to keep the car original.
How long does a suspension kit last once installed?
A quality kit with modern bushings and shocks typically lasts 5 to 10 years or 50,000 to 100,000 miles, depending on driving conditions and how well the car is maintained. Bushings wear out first and can be replaced individually without replacing the whole kit. Regular inspection and lubrication extend the life of all components.