The 4200 Series shocks use AST’s Twin Piston Dual Adjust (TPDA) technology.  Similar non adjustable versions have been found in the highest forms of racing.  TPDA builds on this technology to allow for 2 adjustment knobs to be mounted on the shock body (no tools required).  Quick rebound and compression changes can be made in the pits in seconds.  4200s are fully customizable and rebuildable.

AST-USA offers 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
• Compression and Rebound 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 $2500 for struts and shocks

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

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Current Applications

• BMWs 3 Series (E36, E46)
• Subaru WRX/WRX STI
• Any standard aluminum body coilover shock configuration
• Inquire about others including custom applications