New suspension arc swing correcting rear bump stop drops for the 07+ FJ Cruiser and 03+ 4Runner from Metal-tech 4x4

FJ Cruiser/4Runner Suspension Arc Swing Correction Rear Bump Stop Drops

We are just now releasing these arc swing correcting bump stops.   Figured we would share the suspension tech behind them and how they are made.

First up:  Why?

Since we want to keep the ride height of our trucks low, but still run a large tire for ground clearance a lot of times lowering the bump stop is needed to keep the tire out of the rear fender.

When you use a bump stop drop to control up travel, the arc swing of the rear axle stays the same, but will move the contact point on the stock bump stop rearward.    Crude blocks with long bolts in them will put the bump stop off center to the rear axle from half an inch to almost a full inch depending on the amount of drop used.   Toyota did a good job designing the stock bump stops to take repeated hits and be the last line of defense controlling the axle upward.   Even if you run high end air bumps you still need to run the stock bump stops as the fail safe.    The stock bump stops work the best when properly centered to the axel as designed.     Over a year ago we started working on this new design and have a three trucks test running them for almost 8 months now in two different sizes.   We ran the 3” drops on our FJC all this past summer since we put the 35” tires on.   We will have a 2” version of these coming out shortly as well.

First up, solid model in CAD.   We build the CAD model first and test fit the stock bump stop all digitally.   Once it is confirmed for fit and function we import the solid model into our CAM, or Computer Aided Machining software.   This software allows us to program the tool paths, in this case 8 tools that our CNC mill will use to cut the part.