You knew there were going to be people happy and upset about your new promotion. You walk into the break room. Suddenly, the group of people talking and laughing around the water cooler get quiet and look at you awkwardly. You take on this extra burden like an EGZO Heavy-Duty Rear Leaf Spring for the ST400 takes on the weight of your payload. If only you were as efficient as this thing. No more do you have to worry about what you throw in the cargo box. This spring will handle it. Carry more than twice the weight with this simple upgrade.This golf cart leaf is installed the same way the factory one comes off. It is not a complex process, but that is not to say it is a walk in the park either. You will need to jack up the cart, and having a buddy for safety is always a good idea. If you run into any issues, please call an expert at Buggies Unlimited to help talk you through the EZGO part replacement process.