Rock Slayer Off-Road 4-Link "Buggy Killer" Suspension

At Rock Slayer Off-Road, we offer the first and only high performance 4-Link Complete Kit on the market – there is no competition! All Rock Slayer Off-Road 4-Link Kits are authentic Double Triangulated 4-Link Front and Rear kits. 3-Link Kits are missing an upper link. The Rock Slayer Off-Road 4-Link Kits eliminate the panhard bar – it’s a true 4-Link. Our 4-Link Kits set up your vehicle at stock ride height. You can run a 20” travel shock with our 4-Link Kits. Binding is eliminated due to our 4-Link arch design.  There is no modification to your frame.  We offer the most clearance of any kit out there, plus the 4-Link Kit is tucked up inside and even with the bottom of your frame.

Rock Slayer Off-Road 4-Link Kits have been designed and tested at the Hammers for over 3 years before going into production.  Our 4-Link Kits are all about quality.  We use the best materials: all DOM and ¼” to 3/8” metal brackets; lower, rear upper link material and lower cross member made out of 2” DOM; front upper link 1 ¾” DOM .120 wall; upper cross member is .120 square stock with ¼” plate gussets; 1 ¼” Heim joints all the way around; custom bolts, full shank all the way through the bracket – no threads.  Every 4-Link Kit comes with geometry completed for easy installation and set up in neutral position so no anti-squat or squat when you give it gas unparalleled zero horizontal movement.  Our 4-Link Kits are designed for 1979-95 Toyota Pick Ups and 1984-95 4-Runners.  You must use a 1986 or newer rear axle or Trail Gear’s Rock Assault axles.

At Rock Slayer Off-Road we believe in a one stop shop.  We carry everything you need to install our 4-Link Kits on your vehicle.  You don’t have to search around for parts, send them back if they don’t fit or haggle between companies about warranty issues.

So why run 4-link, if there are so many other, and in some cases cheaper, options available?

4-link v. Leaf Springs


Most people go with leaf springs as a very inexpensive option to get into the sport, and in the short term, they do exactly that.  The installation is simple, inexpensive, and the ability to simply get your feet wet.  

However, when comparing leaf springs to a 4-link set up, like the "Buggy Killer" kit we offer, the advantages are numerous.  

How leaf springs simply do not measure up.

  • Cost - Because leaf springs need constant maintenance, after a few runs one can expect to replace bushings, tightening of U-Bolts, and bent leafs which need to be replaced.
  • Performance - Because leaf springs are directly attached to the frame in two places and then to the axle, wheel travel is severely limited.   Also, when the suspension unloads, leaf springs can cause "axle wrap" (torque will cause axle to rotate) and "wheel hop" (because of the axle rotation the wheels will bounce, which can cause breakage and no traction).  Leaf springs are very rough at high speeds due to the lack of wheel travel, this creates an extremely uncomfortable ride.  Trust me, after a day on the trails in a truck with leaf springs, your body will be the one telling you to buy a 4-link.  Additionally, a leaf spring set up sets your center of gravity very high which causes stability and balance issues across the board.
  • Longevity - Leaf Springs are inexpensive, and therein lies their attraction, however the low cost - coupled with the fact that they were not designed for anything other than holding large amounts of weight, the stress and rigors of the trails cause breakdowns far more often in a leaf system.  Keep in mind that leaf springs were designed long before the automobile, for wagons.  This technology is old technology.  Useful but limited.  You wouldn't make phone calls with a rotary phone, would you?

Why 4-links are better than Leaf Springs.

  • Cost - The initial cost of 4-links are obviously higher.  However, the ultimate cost of running leaf springs ends up being much higher due to upkeep and maintenance.  New leafs and bushings cost money.
  • Performance - Link systems are attached the axle, and then to the middle of the truck. The advantage of this placement, is that it allows the axles to articulate over the rough terrain.  Because it is not attached to the front of the truck, the axle moves instead of the body of the truck, allowing the axle to do the work instead of the body.  When it comes to unload, the culprit is the leaf.  In our system, the ORI air strut, combined with the superior geometry of our 4-link design, eliminates suspension unload completely.  A 4-link system is more stable and much smoother because of its ability to adapt to the terrain beneath the truck  Also, there is no binding with a 4-link system making the movement of the truck much less restricted.  This creates much more control at high speed as well as on the trail, creating a much smoother ride.  Your body will thank you.    With the "Buggy Killer" kit, the truck sits much lower, close to or at stock height, so the center of gravity is very low and enables the truck to balance and be much more stable.  This only adds to the comfort of your experience - your passengers will be much happier with the purchase.
  • Longevity - The "Buggy Killer" kit was designed with longevity being just as important as performance.  From the heim choice to the gusset and bracket design, every single component of our system was designed to take whatever you can throw at it, and chew it up with no complaints.   So while the initial cost of running a leaf spring system might seem attractive, the eventual bill will quickly outstrip the cost of our kit.

3-links - The right track, but still has its limitations.

  • Cost - The cost of 3-links are nearly the same as 4-link kits.  The similarity in price comes from the need to run a panhard bar that equals the cost of the 4th link.  Everything else (i.e. maintenance and upkeep are virtually the same.)
  • Performance - The problem with the 3-link setup is that all the links are straight.  This causes binding, like you see with the leaf spring set ups.  This causes fatigue and stress on the frame and bracketry which can cause failure of the suspension system.  You will not get as much articulation because of the binding the ride suffers.  Now it binds much less than a leaf spring setup, so in this way a 3-link system is a step in the right direction, but it still needs a panhard bar.  A panhard bar locates the axle beneath the truck.  It is connected to the frame and to the axle in a 90 degree position which a link works in an arc.  This causes serious binding and tugging on the frame which causes the frame to tear in some cases.   The panhard bar also limits up-travel, which only reduces performance on the trail.  The other major issue is caused by the fact that when the axles are linked it causes a large amount of torque which is all taken up by that one link,  all that pressure can cause failure of the system in many places.
  • Longevity -  All the stress we mentioned above takes a major toll on all the suspension components and your frame.  This obviously reduces longevity and dependability as well as increases the need to spend additional money and do additional work to keep your truck in trail condition.

Why 4 links are better than 3.

  • Cost -  As was said before the costs of the 3-link is nearly identical to that of the 4-link kit.  
  • Performance - The biggest advantage that a 4-link kit, and more specifically our "Buggy Killer" kit, will out perform a 3-link system is the geometry of the links and the lack of a panhard bar which limits up-travel and increases wear and tear.   Our "Buggy Killer" kit is a double triangulated link system.  This creates several things:  no binding, more up and down travel, more articulation, more stability, and most of all BRUTE STRENGTH!   The "Buggy Killer" kit was designed to increase performance and be rock solid for years of pleasurable wheeling with little to no maintenance.   Where the 3-link is connected to the axle in a 90 degree position limiting the travel, as we said before, our kit works in an complete arc.  The arc design allows for further articulation and stability by limiting stress and binding.  A 4-link system utilizes two links to control the torque of the axle.  This further reduces stress and increases longevity and dependability.  This kit was designed for the serious off-road enthusiast.
  • Longevity - As we said above, the utilization of an additional link greatly reduces stress on the system.   Stress causes failure and breakage, not to mention the headache of having to spend more money and time to get back into wheeling shape.