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Street Race Truck More... The Toolbox

Shocks - 410 Sprint Car

9/6/2019

The shock episode of our 410 Sprint Car Build starts at Speedway Motors Shocks where they are building the Pro Shocks for our sprint car. Jason and Charles are putting together a new set of Pro A1 Series shocks. Watch for a behind the scenes look at how our Pro Shocks are built.

While Jason is building the shocks, he places a gas bag inside of the shock. This has a controlled amount of air that takes up space inside of the shock, so whenever the pressure changes there is room for it. We are building a twin-tube shock which is nice for rough tracks or if you get dents often. We use a spring rater because we can build our shocks a lot more accurate if we rate each spring.

After we assemble the shock, we place it on the vacuum machine to remove all of the air and oil. The reason you remove all of the air is to avoid cavitation. Next, we move to the dyno to ensure this shock is within our parameters. This shock is within our range, so we are ready to put it on the car.

After unboxing the shocks, you first need to put the rod ends on the shocks. On the left rear, we are adding a bump rubber and a bump cup. First, place the travel marker on so you can check the suspension travel. One side of the jam nut is machined flat and is preferred to go up against the rod end.

When putting the bump rubber and cup together, remove the adapter and place the big side of the bump rubber inside of the cup. Then, add that to your shock assembly, put on the nut, adapter, and rod end. Once you have all of that installed, put the spring back on and slide everything up.

Now that the shock is assembled, it's time to get ready to install it. The first step is to put the shock mounts on the car. Our Eagle Motorsports front axle has adjustable shock mounts which allow you to switch the length of the shock if you need to. The top hole on the left side is the standard position and the lower two can be used if you need to lengthen your shock. On the right side, the middle hole is the standard position. After the shock mounts are all set, we can put the shocks on the car. The 9-inch shock is for the right rear. The guys like the put the logo facing out and the information on the inside.

Thanks for tuning in! Next time, we're working on the wheels and tires. You won't want to miss it!

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