Infiniti G35 Subframe Bushings: Choosing Replacement Parts
The rear subframe on an Infiniti G35 carries the differential and rear suspension links, and it attaches to the body through bushings that isolate noise and absorb driveline loads. When those bushings tear, soften or develop voids, owners often notice wheel hop on hard launches, clunks over bumps or a loose feel from the rear. Choosing replacements is less about finding one best part and more about matching material and design to your vehicle configuration, driving habits and tolerance for cabin noise.
Define the job the product must do
Start by deciding what you want the new bushings to accomplish. A daily-driven G35 that simply needs to stop clunking has very different needs from a car used for track days, drag launches or drifting. For commuting, the goal is usually to restore factory behavior: quiet operation, predictable handling and no movement of the subframe under throttle. For performance use, many owners want less subframe deflection so the rear axle stays planted, and they accept more vibration and noise as the price of that control.
Before buying anything, confirm the bushings are actually the problem. A careful inspection should look for cracked or separated rubber, visible voids, fluid or debris pushed out of the bushing, and signs that the subframe has shifted relative to its mounting points. Similar symptoms can come from worn differential mount bushings, tired rear control arm bushings, loose hardware or driveline wear. Reviewing the car's service history also helps: if parts in the rear suspension were already replaced, note what was installed so you do not mix incompatible designs or duplicate work.
Check compatibility
The G35 was sold across several model years, body styles and drivetrains, and those details determine which parts fit. Identify your exact model year, whether the car is a sedan or coupe, and whether it is rear-wheel drive or an all-wheel-drive G35x. The earlier and later generations of the sedan do not necessarily share the same suspension components, so a listing that says only "fits G35" is not enough. The most reliable approach is to confirm the factory part number for your VIN through a dealer parts catalog and compare it to the replacement manufacturer's fitment list.
Also check what a kit actually covers. Some packages include every subframe mounting position, while others cover only the front or rear pair. Determine whether the product is a complete replacement bushing that requires pressing out the original, an insert designed to fill the voids in the factory bushing, or a collar that sits between the mounting bolt and the body. Finally, compare the included hardware to what the manufacturer specifications call for, and check the factory service manual on whether original mounting bolts may be reused or should be replaced.
Features that affect the choice
Material is the biggest decision. OEM-style rubber bushings give the quietest ride and the most factory-like feel, and they are the safest choice when comfort matters most. Polyurethane bushings are firmer and resist deflection better, which can reduce subframe movement under load, but they transmit more vibration and noise into the cabin and may require periodic lubrication to stay quiet. Void-filling inserts sit inside the existing factory bushings; they typically cost less and avoid pressing out the originals, but they only work if the factory rubber is still structurally intact.
Subframe collars are often mentioned alongside bushings but solve a different problem. They take up clearance between the mounting bolt and the body to limit lateral shifting of the subframe; they do not replace a torn or collapsed bushing. Treat marketing labels carefully. Claims such as "eliminates wheel hop" are hard to verify because wheel hop can involve tires, shocks, differential mounts and driving technique. More useful evidence includes a stated material and hardness rating, a clear fitment list by year and body style, detailed installation instructions, and a description of what is included in the box.
Limitations and ownership costs
Full bushing replacement is a substantial job. The subframe usually has to be supported and lowered, and the old bushings must be pressed or cut out, which often calls for a dedicated press tool or shop equipment. Exhaust, driveshaft and brake line clearance may need attention while the subframe is down. A wheel alignment is commonly recommended afterward, since rear geometry can change when the subframe is removed and reinstalled. If you pay a shop, labor can easily exceed the cost of the parts, so request a quote before choosing a premium kit.
Because the subframe is already accessible, many owners inspect the differential mount bushings and rear control arm bushings at the same time; replacing worn neighbors together can save repeat labor. Ongoing costs depend on material: polyurethane may need grease to control squeaks, and stiffer setups can make interior rattles more noticeable. No bushing will fix bad axles, worn shocks or a damaged differential, and stiffer parts can expose other weak components. Follow the maintenance schedule and inspection intervals in the factory service documentation rather than assuming a universal replacement interval.
Build a practical shortlist
Narrow your options with a short checklist. First, confirm the part numbers match your model year, body style and drivetrain. Second, decide whether you need complete replacement bushings, inserts for intact factory bushings, or collars to address shifting alone. Third, match the material to your operating conditions: rubber for comfort-focused daily driving, polyurethane or firmer designs when reduced deflection matters more than cabin quiet. Fourth, verify that the kit covers every position you intend to replace and includes any hardware the service manual requires.
Then compare the total cost of ownership rather than the part price alone. Factor in tools or shop labor, an alignment, any related bushings you plan to replace while the subframe is down, and the possible need for lubrication on polyurethane parts. Prefer sellers that publish clear fitment data, material details and installation instructions over listings that rely on vague performance promises. A shortlist built this way usually leaves two or three suitable options, and the final choice comes down to how much ride comfort you are willing to trade for rear-end stability.