Witnesses said they saw the truck pull up before the shooting and leave after the shooting.
According to charging documents, one of the men injured in the shooting was Ferrell.
Police said they were able to track down the truck when Sims took Farrell to Cardinal Glennon Hospital for treatment of a gunshot wound to the ankle.
Police said the truck was spotted driving to Cardinal Glennon Hospital, where Sims dropped off Ferrell.
When police discovered Sims and his mother owned the car, they applied for a search warrant and took Sims into custody.
Police said Sims admitted to driving Ferrell to the gathering and pointing out people at the park before Ferrell began shooting.
Three other men were wounded and police said more than 100 people ran for their lives. It was crazy, Monroe said. You could see people fleeing and everything. There was a guy in the street who was definitely injured. I definitely feel sorry for the victims and their families.
Signs posted at Kinloch Park state it currently closes 30 minutes after sunset and no alcoholic beverages are allowed.
Kinloch Mayor Evelyn Carter lives down the street from the park which she said is usually peaceful.
Still, Mayor Carter now wants an ordinance passed that could close the park as early as 5:30 p.m.