Suspension bushings are the parts nobody thinks about until every rubber joint on the car is 40 years old and the car feels vague, clunky, and imprecise. Replacing all the bushings on a classic is one of those jobs that dramatically improves a car's character without adding a single horsepower or upgrading a single visible component. This roundup covers the complete-vehicle kits for popular chassis, the rubber-vs-poly trade-off, and what you'll need to actually install them.
This roundup complements our full suspension upgrade guide, which covers the bigger structural upgrades (springs, sway bars, subframe connectors). Read that first if you're planning a comprehensive suspension refresh; use this one when the bushings themselves are what needs attention.
Rubber vs Polyurethane
Rubber bushings are what the car came with. They isolate road noise and vibration, they compress and rebound softly under load, and they wear out after decades. New rubber restores the factory-original feel — quiet, compliant, forgiving. They also allow more suspension deflection under hard cornering, which is why aggressive drivers upgrade to poly.
Polyurethane bushings are stiffer, tighter, and more precise. The suspension responds more directly to steering input and there's less deflection under load — great for autocross, canyon driving, and any application where sharp handling matters. The cost is noise: poly transmits more road harshness and can squeak if not properly greased. For a daily driver you want to enjoy, poly in the sway-bar end links and control-arm outer bushings is a common middle path — keep rubber in the inner control-arm mounts where compliance matters most for comfort.
Our Picks
Complete Bushing Kits — Muscle-Era GM (1964-1972 A-Body)
One kit covers every rubber bushing on the car — control arms upper and lower, sway bars, leaf-spring eyes and shackles, body mounts. Available in rubber (OE-style) or poly (Prothane, Energy Suspension). Kit contents vary by year — verify.
Complete Bushing Kits — 1965-1970 Ford Mustang
First-gen Mustang bushing coverage — front control arms, strut rods, sway bar, leaf springs, shackles. Both rubber and poly options widely available with year-specific fitment.
Energy Suspension Polyurethane Bushing Kits
One of the best-known poly bushing brands with broad classic-vehicle coverage. Red poly is standard; higher-durometer black is available for heavier applications. Includes bushing grease and installation instructions.
Prothane Polyurethane Bushing Kits
Prothane's chassis coverage overlaps and sometimes exceeds Energy Suspension for certain applications. Verify which brand covers your specific chassis and year combination — some fit more precisely than others.
Sway Bar End-Link & Bushing Kits
Quick-hit upgrade for a car that clunks over bumps. Sway-bar bushings live between the bar and the frame; end links connect the bar to the control arms. All wear out; both are inexpensive to replace.
Body Mount Kits (Muscle-Era GM & Ford)
Body-to-frame mounts on body-on-frame classics. When they compress and crack, the body sits lower on the frame and shakes independently. Full body-mount replacement transforms how solid the car feels.
Bushing Press & Puller Kit
Threaded rod, receiver cups, and driver plates for pressing bushings in and out of control arms and other components. Some bushings can be done with a shop press; others need this on-the-car approach because the component doesn't come off easily.
Installation Reality
Bushing replacement is one of those jobs that ranges from 'straightforward with the right tools' to 'unreasonable without them.' Old rubber bushings often bond to the metal sleeves they surround, requiring either burning them out with a torch or pressing them out under significant force. Polyurethane bushings need to be greased with the manufacturer-supplied silicone grease during install — using standard automotive grease attacks the poly. Rushing bushing work leads to torn poly, bent control arms, or bushings installed slightly off-center that fail early.
For control-arm bushings on a car that's still assembled: consider having the arms rebuilt by a shop with a proper press. Most driveline and suspension shops will press old bushings out and new ones in for reasonable money, and you avoid the wrestling match with a stubborn 40-year-old rubber bushing on a jack in your driveway.
Which Bushings to Prioritize
Not every bushing on a classic contributes equally to how the car feels. If you're phasing the work rather than doing everything at once, prioritize in this order:
- Control-arm inner and outer bushings. The biggest single influence on steering precision and cornering feel. Worn control-arm bushings let the wheels toe in and out under load, changing the alignment mid-corner.
- Sway-bar bushings and end links. The most-common source of clunks over bumps. Cheap and quick to replace.
- Strut-rod bushings (where equipped). Absorb longitudinal loading under braking. When worn, the front end shifts fore-and-aft under stopping.
- Leaf-spring eye and shackle bushings. Rear suspension precision on leaf-spring cars. Sloppy bushings here make the rear axle steer under acceleration and braking.
- Body mounts. The whole car sits on these. Cracked body mounts let the body shake independently of the frame.
- Steering-linkage bushings and idler-arm bushings. Also critical for steering feel, but usually addressed as part of steering-linkage refresh rather than bushing refresh.
The Grease That Matters
Polyurethane bushings must be assembled with the manufacturer-supplied silicone grease — never with lithium-based automotive grease. Petroleum-based greases attack the poly and cause it to swell, harden, or degrade over months. The included silicone grease is usually a small tube that goes on the bushing-to-metal contact surfaces during install. Use all of it. If you run out, buy more silicone grease specifically labeled for suspension bushings, not standard silicone plumbing grease (which is typically not rated for the same load range).
Rubber bushings don't need to be pre-greased — they're a press-fit design that relies on the rubber's own elasticity to hold position. Do not lubricate a rubber bushing during install; the metal-to-rubber bond needs to grip. Some rubber bushings arrive with a light installation lubricant on the outer sleeve to help the bushing seat into the arm — that's different from post-install grease and dries away in service.
Frequently Asked Questions
Will polyurethane bushings make my car ride harsh?
Somewhat, yes. Poly transmits more road noise and small-bump harshness than rubber. On a well-tuned car with modern radials, most drivers find the trade-off acceptable — the car feels crisper and more responsive. On rough or broken pavement, poly can feel busy. The hybrid approach (poly on high-motion joints, rubber on low-motion) is the compromise most restorers land on.
How do I know when my bushings need replacement?
Visible signs: cracks in rubber, oil contamination, control-arm bushings that look flattened or extruded. Symptoms: clunking over bumps, vague steering feel, uneven tire wear that alignment doesn't fix, a car that feels 'floppy' or 'sloppy' compared to how you remember it. On any car past 30 years old, if the bushings have never been replaced, they need attention.
Do I have to replace all bushings at once?
No — bushing replacement can be phased. The most-worn joints first, others as time and money allow. That said, once you're doing the labor of getting a control arm apart, replacing all its bushings makes more sense than replacing one and coming back for the other.
Can I install poly bushings in the existing metal sleeves from the old rubber ones?
Depends on the design. Some poly kits include new metal sleeves; some are designed to fit into the existing outer shell after burning the old rubber out. Read the specific product's instructions. Never install new bushings into a corroded or damaged sleeve — the fit will be wrong and they'll fail early.