Note: If kits are backordered, expect 3-8 weeks for delivery. Call for more details on availability.

Taking the knowledge and experience learned with the 4000 Series of dampers, AST is now building the new 5000 Series dampers. Want to know more about the various AST models? Please go to this page or click the "AST Shocks" button along the top of any page on our website.

One key feature on the 5000 series shocks is modularity, which makes them easily upgradeable. This provides an upgrade path for customers on a tight budget that want an adjustable, high performance, race-ready shock but can't quite afford the double adjustable 5200 or triple adjustable 5300. Simply purchase 5100s, and when you're ready, send your ASTs to an authorized rebuild center to upgrade them to 5200s or 5300s with remote reservoirs. Rest knowing that your shock absorber investment will perform today and in the future, as your budget and needs grow.

(Click on thumbnails for larger image)

Parts Included in the basic AST 5000 kit:

• 2 AST 5100 Single Adjustable (12 adj, Rebound only) Monotube Front Shocks (no reservoirs) with threaded aluminum bodies, adjustable height perches and spherical lower shock mount
• 2 AST 5100 Single Adjustable (12 adj, Rebound only) Monotube Rear Shocks (no reservoirs) with threaded aluminum bodies, adjustable height perches and spherical lower shock mount
• AST upper spring perches for 60mm springs, for use on the shocks and your OEM upper shock top mounts
• 4 60mm ID springs
• Adapter rings for the front struts to use your 2.5" inner diameter coilover springs
• AST Tool Kit

There are several optional upgrades available with this kit, such as the coilover springs needed, rear ride height adjusters, and to upgrade to a 5200 or 5300 series shock at the time of purchase (the 5100 shocks can be upgrade later for slightly more than the cost difference when new).

Optional Parts and Upgrades:

• AST spherical top mounts for all 4 shocks
• Upgrade to AST 5200 Double Adjustables (12 adj Rebound + 12 adj Compression) with remote reservoirs
• Upgrade to AST 5300 Triple Adjustables (12 adj Rebound + 12 adj Low speed Compression and + 12 adj High speed Compression) with remote reservoirs
•  Please call for pricing and ordering information on 5200/5300s

(click on thumbnails for larger image. Some pictures are from other vehicles and/or shown with optional components or series upgrades)

The Design

AST coilovers are monotube, high pressure nitrogen shock absorbers. Why do you care? Most other products on the market are twin tube designs and are not pressurized, or only have 1-2 atmospheres of Nitrogen in a little bag inside. Monotube shocks offer the biggest pistons for more control. High Nitrogen gas pressurization in Monotubes (8-12 atmospheres) means the oil will never cavitate around the piston. This is particularly important in environments where the vehicle makes rapid changes in direction such as autocross and road racing. Monotubes also allow for a wider damping range and can more easily provide a better ride with stiffer spring rates - we usually start with 3X the stock rates and often go to 6-7X the stock spring rates, even on street driven cars. This is the same technology used on $7,000-10,000 shocks packaged here in a competitively priced kit.

ASTs are hand built in Holland

These shocks are built from scratch at the AST factory, with everything machined in house - these are not just simply inserts bolted into a stock strut body or a "one size fits all" strut insert slapped into some cheap import strut. They are shortened approximately 1" from stock height. This is important when you lower a car, if the strut or shock body is not shortened you will run out of travel quickly. Couple this with Vorshlag camber plates and you'll have one of the largest suspension travel ranges in the business. The shocks have adjusters that install permanently to the strut/shock - No need to carry tools with you to make adjustments, just reach in and turn a knob for 12 solid clicks of adjustment, each of which makes a consistent and significant change.

Custom Valving

AST-USA is setup to offer custom valving services to our customers, including dyno services on our Roehrig 2VS shock dyno; they can even rate your old springs if you are curious (fees apply). There's no need to find a third party company to get your custom valving applied - Just send them back to AST-USA or one of the AST Authorized Rebuild Centers we'll get you the rates you need (fees apply).

Who is AST? Check out the video and additional company information on the AST-USA website.

Shock Tuning Help?

New to adjustable shocks, or have had them before but not the knowledge to tune them to alter the car's handling? We are here to help. Please click here for our AST Shock Tuning Guide to get a good head start on the process. Once you start using adjustable shocks, especially high end monotubes that make a noticeable damping change with each click, you'll wonder why you didn't start off with these sooner!



Choose the appropriate options and model alterations from the drop down menus below. These options will affect the final price as shown for each option. All optional packages and parts include significant discounts when purchased with shocks rather than buying the parts separately.

ADDITIONAL SPRINGS : While AST-USA provides four springs with set rates, you can purchase additional springs for tuning purposes by using this drop down. When purchasing an extra set of 60mm springs with your coilover set, the springs are discounted from their retail prices. The spring options listed include our GT package for daily driven cars, the GTS package for street cars that are also used in autocross and/or track events and the GTR package for race cars that predominantly see track use. You can pick "Custom" and tell us the lengths and rates you want (some choices may incur a shipping delay for unusual spring rates). Vorshlag stocks and sells springs from Hypercoil and Eibach Tender springs.

All Hyperco springs are measured in inch lengths and rate is in pounds of force per inch of travel (lbs/in). To convert to metric length multiply inches x 25.4. To convert to Newtons/mm for rate you need to divide the lbs/in number by 5.7. To convert rate to Kg/cm divide the lbs/in rate by 57.

• 2 Front 60mm Coilover Springs
• 2 Rear 60mm Coilover Springs
• The GT package is N/A
• The GTS package is N/A
• The GTR package is N/A
• Please note: Higher rate springs can be slightly shorter in length depending on model

TOP MOUNTS : Optional Top Mounts include the AST Spherical design. We recommend the spherical top mounts for most users that see any competition use, such as autocross or track events. If the car is a daily driven vehicle only and/or the user is extremely nervous about bad roads and any additional NVH transmitted through a spherical mount, then reuse the stock shock mounts. The advantage to spherical top mounts is their ability to transmit reactions to shock forces instantly and directly instead of having a rubber bushing in the load path - something that shows up on a shock dyno plot.