The 4100 Series shocks introduce high performance monotube technology at prices competitive with twin tube insert coilover kits.  They include purpose built strut and shock bodies, shortened from stock lengths.  All kits come with anodized aluminum adjusters that stay on the shock; no need to keep your pockets full of tools to make quick adjustments.

We offer full rebuilding and revalving services for AST shocks at competitive prices.  This includes quick turn around when you need it the most.

Benefits include:

• Monotube design - gives the biggest piston sizes available
• Floating piston design with high pressure nitrogen means no cavitation around the piston
• Adjuster knobs permanently mounted on the dampers – no fumbling for knobs
• Fully threaded strut bodies allow maximum tire width without fender rolling or larger spacers
• Rebuildable by AST-USA – get the valving you want, when you want it.

Pricing starts at $1650 for struts and shocks (without springs)

AST-USA provides a 12 month warranty on the 4100 Series shocks and dampers. 

» Rebound Adjustable ("Singles")
» 22mm diameter shaft struts, non-inverted
» Steel cylinder body shocks, non-inverted
» Rubber bushings for "eye" shock mounts
» Optional spherical upper shock mount assemblies
» Non-synthetic hydraulic fluid

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Current Applications

• BMWs 3 Series (E30, E36, E46, E90 coming soon)
• Subaru WRX/WRX STI
• Mazda RX-8
• Nissan 350Z
• Mini Cooper
• Inquire about others including custom applications