The best way to sharpen tired handling without replacing every suspension arm is a Prothane polyurethane bushing kit — firmer than factory rubber, application-specific, and a direct fit for cars like the 08-10 Subaru WRX and classic Datsun Z models. Pair a total kit with a Prothane shifter kit and the whole car feels more connected, with crisper steering and tighter shifts.
Factory rubber bushings are a wear item. After years of heat, oil, and ozone they soften and crack, letting control arms, sway bars, and shifter assemblies move in ways they shouldn't — which is why an older car feels vague even on fresh tires. Prothane replaces those worn factory pieces with polyurethane components built to hold suspension geometry steady under load, so steering response tightens and the chassis feels more planted. The parts come in Prothane's signature red or black, with the same durometer and formulation in both colors.
The Prothane lineup at JDMuscle covers the full spectrum: application-specific total kits like the Prothane 08-10 WRX Total Kit in red, which refreshes control arms, sway bars, shocks, and shifter bushings in one box; targeted pieces like the 70-78 Datsun 240/260/280Z rear control arm bushings; and 5-speed shifter kits like the 98-12 Impreza 5spd Shifter Kit in black. Many builders combine a bushing refresh with parts from our Suspension Bushings, Shifters And Bushings, Chassis Bracing, and Suspension collections, and our guide to how aftermarket parts improve handling explains where bushings fit in the picture.
Popular brands: this collection is all Prothane — polyurethane bushings, shifter kits, and Super Grease.
Will polyurethane bushings make my ride harsher?
There is a small increase in noise, vibration, and harshness compared with soft factory rubber — that is the trade for crisper response. Most daily drivers find the difference mild and worth it.
Do I need Prothane Super Grease?
Yes — polyurethane bushings should be greased at install to prevent squeaking. Prothane Super Grease is sold separately in handy packets, and many kits include it.
Will a total kit fit my car?
Total kits are application-specific, so check your year and model before ordering — the 08-10 WRX kit, for example, covers only those chassis years.
Do I need a tune after installing bushings?
No. Bushings and shifter kits are mechanical upgrades that require no ECU changes; just get an alignment check after any control arm work.
