J.A.'s Toyota 4Runner Highlander
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 Addco Anti-Sway Bars:
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  • Addco
    4Runner Sway Bar Kit
    573 Front
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    One of the easiest and most cost effective ways to improve the handling of your truck is to install high performance front and rear anti-sway bars. High performance sway bars decrease body roll and keep the weight of the vehicle vertically over the tires, reducing drift, wheel lift and understeer.
    I have replaced the factory sway bars on my 4Runner with the versions made by Addco. Currently, they are the only company that manufactures sway bars for the Toyota 4Runner. You may notice sway bars marketed by Performance Products, and P-S-T, but Addco is the manufacturer of the sway bars for both those companies.
    The stiffness, or torque resistance, of an anti-sway bar is proportional to the diameter of the bar raised to the 4th power. Therefore a small increase in diameter of an identically shaped sway bar provides a major increase in anti-sway bar effectiveness. Please review the chart and pictures below to see the difference between the Toyota factory bars compared with Addco's version.
    Sway Bar Toyota Factory
    Stock Bar
    Addco Sway Bar Percentage
    in stiffness
    Front Sway Bar 1 inch
    9 lbs.
    1 1/4 inch
    15 lbs.
    Top = Toyota front bar
    Bottom = Addco front bar
    Rear Sway Bar 3/4 inch
    5 lbs.
    1 inch
    12 lbs.
    Top = Toyota rear bar
    Bottom = Addco rear bar

    Addco's Toyota 4Runner Sway Bar Kit

    Front bracket bolts

    Rear bracket bolts


    Installation is straight forward. The job can be completed by one person working alone.
    Before starting spray all nuts to be removed with a penetrating lubricant such as WD-40. Park the vehicle on flat ground. The use of a lift or supporting the vehicle by the frame and allowing the wheels to hang can cause bar misalignment and installation difficulties. The 4Runner is high enough to work on without using ramps, or other means that support the vehicle by the wheels.
    I have decided to re-use the front Toyota end links rather than the ones provided by Addco. The Toyota endlinks have a ball joint built into the lower part and I wanted to retain that feature. When using the factory front endlinks you cannot use the red urethane bushings provided in the Addco kit. They are too tall and the nut cannot be put back on. You can use the Toyota rubber bushings but I decided to use the firmer Addco black urethane end link bushings up front. Their low profile works well when you factor in the larger ends of the new sway bar.
    When you remove the front sway bar brackets you will notice that it uses captive hardware, ie. it cannot be reused. Addco does not provide the nuts and bolts you need to install the front brackets. The specification of the nuts and bolts I used are listed in a section above.
    Originally I re-used the rear sway bar bracket bolts, but I do not recommend them. The factory bolts are M8x1.25x16mm with a 12mm head and they have a split lock washer. They were a little difficult to get initally threaded in to the frame due to the slight curvature of the Addco bracket and due to the flat washer I used to spread the load on the head of the bolt over the larger hole in the Addco bracket. After a few weeks one of the factory rear sway bar bracket bolts came loose and fell out. The bracket holding the bar bent and I had to order a new one. I now am using Grade 8.8 M8x1.25x20mm, with a 13mm head and a split lock washer and a flat washer. Also I boosted the 14ft/lbs of torque which Toyota recommends up some but I would recommend to be real careful to NOT strip the threads in the frame. I guess that would be worse than the bolt falling out?
    Addco provides 8 black urethane bushings for the rear endlinks, you need only 4. They are a little to thin for this application and if you do decide to use them you will need to shim them up with a few washers in order to get enough torque on the nut. You can just leave the factory rubber bushings in their place and never even have to remove the upper nut on the rear end link. What I decided to do was to use the Addco red urethane bushings for the rear end links. They fit well, are much firmer and look nice also.

    Rear end-link
    with red polyurethane bushings

    When you are reinstalling the new sway bar brackets and polyurethane bushings, use plenty of lube to avoid squeaking and also make sure the cut in the bushings faces the front of the vehicle.
    Effective September 2000 Addco has released a revised 4Runner rear bar. Some people with the older bar (which includes the red powdercoated versions that Addco was shipping for a short period) have experienced rubbing between the rear bar and the exhaust flange. This is dependent upon individual vehicle set-up. Those that experience rubbing seem to have installed a non-stock exhaust system while keeping the stock springs, or have just installed lowering springs. The new bar is the exact same shape but the hump that goes over the driveshaft is angled up a little more to provide better clearance.

    Top = Addco revised bar
    Bottom = Addco older bar

    It was necessary for me to lift the vehicle to fish in the new rear sway bar. I accomplished this by placing a wood board under the rear tow hitch and using that as a jacking point.
    Sway Bars Installed
    Front Rear

    Off Road Disadvantages:
    For those of you who are concerned with off-road performance as well, you should take into consideration that the improved cornering performance comes with a tradeoff. Because the sway bars connect both the left and right sides of the suspension together, it reduces their independence. Off road vehicles need as much ability for the axle to articulate as possible to keep the wheels on the ground while traveling over extremely uneven terrain such as rocks and gullies. By increasing the size of the sway bars, you loose some of this articulation ability.
    Differential lockers will help compensate for lack of articulation when a wheel is lifted in the air due to reduced flex, but on extreme trails you need all four wheels on the ground pulling to make it over steep obstacles. RockStomper sells quick disconnects so you can quicky and easily disconnect the sway bars from the endlinks giving you maximum articulation while off road.
    The following table shows measurements I took to see how much wheel travel is really lost with the larger sway bars and how much can be gained without any bars connected. I did not have access to a professional RTI Ramp (Ramp Travel Index), so I do realize my measurements will not be of exact precision. Please note these measurements are for my vehicle and yours will vary based on your individual vehicle set-up. All measurements were taken with stock springs, shocks, bumpstops, tires and air pressure.
    Wheel Travel
    Stock Sway Bars



    Wheel Travel
    Front : 4 3/8 inches
    Rear : 15 inches

    Sway Bars Removed



    Wheel Travel
    Front : 7 1/2 inches
    Rear : 16 1/4 inches
    Increase in wheel travel
       by removing stock bars   
    Front : 3 1/8 inches
    Rear : 1 1/4 inches

    Addco Sway Bars



    Wheel Travel
    Front : 4 inches
    Rear : 10 inches
    Decrease in wheel travel
       by installing Addco bars   
    Front : 3/8 inches
    Rear : 5 inches

    Performance Review:
    I feel that the Addco sway bars were well worth the money for the improvement in on-road handling. They really help to control the near 4,000 pound SUV. It feels more stable at speed. The rig now corners nearly flat as body roll is significantly reduced.
    Originally I had decided to leave the rubber end link bushings on all around. But with the rear bar disconnected and the rubber bushings installed, you could literally pull on the end link shaft and really compress the bushings. I am glad I used the polyurethane bushings all around. I am sure they add to the stability during cornering.
    So far the bars do not appear to be too harsh during on-road driving. I do go off road driving a few times per year, but overall it is a very small percentage of my mileage. The trails I prefer to take my daily driver on are not too technical anyhow. So right now I am not too concerned with the loss of rear wheel travel as explained above.

    Toyota 4Runner Topsites

    This Page Last Modified: March 11, 2019.
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