TeraFlex 13-04-21-400-002 0-2.25” Falcon Sport Leveling Shock Absorber System

TeraFlex 13-04-21-400-002 0-2.25” Falcon Sport Leveling Shock Absorber System
1399.99In stock
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  • SKU: TF-13-04-21-400-002
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  • Part Number: 13-04-21-400-002

2007-2018 Toyota Tundra 2WD/4WD Gas

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Product Details

The 2007+ Toyota Tundra: Falcon Sport Leveling Shock Absorber Systems deliver increased stability and control as well as improved ride quality and comfort both on and off-road. These compact and affordable shocks are ideal for daily driven vehicles. ZRT - Zone Rate Tuning: Zone Rate Tuning (ZRT) manipulates the factory linear-rate spring tuning to produce three distinct performance zones with a more exaggerated spring curve to tackle various driving conditions.

An internal negative-rate spring offsets the factory springs preload while in the Extension Zone. This eliminates top out clunk and shock stress at full extension, while softening tire landing and reducing body roll on impact during aggressive driving.

The factory spring rate is unaffected in Drive Zone for a comfortable and controlled ride. A provided progressive microcellular bump stop effectively retunes the spring rate while in Compression Zone to reduce bottoming and body roll during aggressive driving.

VOD - Volume Optimized Damping: Falcon Shocks proprietary Volume Optimized Damping (VOD) features a digressive linear valve that improves vehicle feedback and control during low-speed, high-speed, and off-road driving. As the piston compresses and rebounds, the valve restricts oil flow creating a damping effect.

VOD produces quicker ramp up for increased damping volume, which improves vehicle feedback and control during low-speed driving. Additionally, VOD improves the shock absorbers ability to reduce bottoming out at full compression during faster speeds or over uneven terrain.

Traditional velocity sensitive shock absorbers react quickly during low speed driving causing excessive toss on rough terrain or even driveways. Conventional damping then firms up during faster speeds resulting in a jarring ride. With Volume Optimized Damping, stability and control are maintained throughout all driving conditions.

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  • Front leveling monotube shock absorbers w/ fixed rate damping optimized for on-off-road driving
  • Rear piggyback shock absorbers w/ fixed rate damping optimized for on-off-road driving Piggyback Shock Absorbers:
  • Piggyback design features increased oilgas capacity vs. monotube or twin-tube designs reducing heat buildup for more consistent performance
  • Piggyback fluid passage design flows 6 times more oil than restrictive reservoir hose designs as well as eliminates common leakage issues found in banjoswivel fittings Falcon Truck Shocks:
  • Front shock features multiple snap ring grooves to level out front end
  • Snap ring grooves maintain set ride height (instructions laser etched on shock body)
  • Largest shock body that will fit w/out modifications
  • Zone Rate Tuning (ZRT) retunes the factory spring in the Extension, DriveCompression zones
  • Negative spring inside shock body eliminates top out clunk, softens tire landing,reduces body rollstress on shock
  • Application-specific tuned bump stop reduces bottoming outbody roll
  • High-quality spherical bushings (when applicable)
  • Zerk fittings to lube bushing (when applicable) All Falcon Shocks:
  • Vehicle-specific shock absorbers
  • Race-inspired performance for increased vehicle stability
  • Improved dynamic roll controllow speed damping
  • Dramatic improvement in on-road comfortoff-road performance
  • Optimized fitment for clearance during full suspension travel
  • 2.25 shock body provides optimal performance
  • 6061-T6 aluminum alloy shock body resists wearprotects internal components while providing superior heat dissipation
  • Smooth honed internal shock body surface for long-term performance
  • 3/4 induction hardened chrome plated shaft resists rock damagecorrosion as well as prevents shaft buckling
  • Maximum shaft diameter allows for more precise tuning
  • Hard anodized billet piston
  • 1-piece Teflon bronze piston wear band w/ O-ring
  • Digressive linear pistonbase valve technology
  • Volume Optimized Damping (VOD) features a digressive linear piston for quicker ramp upincreased damping volume
  • Inline OGS (Oil/Gas Separator) prevents cavitation
  • Red Line full synthetic shock oil with high viscosity index of 519 for consistent performance across all temperaturesreduced shock fade
  • Synthetic formula also contains special anti-wearlubricity agents for excellent thermal stability
  • 1,000-hour salt spray corrosion resistance test on all hardware
  • Serviceablerebuildable (factory serviced)
  • Built in-house at the TeraFlex Falcon Shock Division
  • Patent pending design
  • 3-year warranty


  • Leveling monotube shock absorbers
  • Progressive microcellular "foam" bump stops
  • Billet coil spring carrier
  • Injection molded squeak-free spring isolator
  • All necessary hardware

Important Notes

  • Never exceed factory tow/haul ratings.
  • Install Time: 3.5 Hours