Video captured the scenes on Saturday, where Grady could be seen punching Callihan while he was sitting inside his car.
Grady’s barrage continued and he was seen kicking the vehicle before being picked up by a staff member and carried away.
Moments later, several men were seen trying to calm Grady down after he repeatedly hit Callihan and kicked his car.
Grady unleashed his barrage following an accident during the heat race where he competed with Callihan for a transfer spot.
He later claimed Callihan had flipped him off and that he had gone into a rage shortly afterward.
The driver told Racing America: “He flipped me off. So, I started Mike Tysoning his head. At the end of the day, we did really, really good.
“Car was running fast. But man, you get these dumba**** that come in here and run with us, and they have no business running a late-model much less a lawn mower.
“He wasn’t close, he dive-bombed me, he hooked me. And I wanted to talk to him and he flipped me off. So, I started Mike Tysoning his head. You’re in a big boy sport.
“When you wreck a man, you can take a grown man a** whipping. That’s how I feel about it.”
According to Racing America editor-in-chief Matt Weaver, Callihan denied having flipped off Grady.
He said: “No, I never flipped anybody off. He just comes, started punching me inside the race car. I understand he’s frustrated, but then again it was for the transfer spot and we were just fighting for our life.”
Newsweek has contacted NASCAR for comment.
NASCAR stirs many emotions on and off the track and some of the sport’s greats have opened up about their feelings and racing.
Kyle Petty previously told Newsweek he never reconsidered racing even after his son Adam died in a driving accident.
He said: “No. Never. It never crossed my mind to stop racing. Instead, I felt called to continue racing, probably longer than I should have, for Adam.
“Since the day I was born, I’ve been around racing. It’s part of my DNA. I’m from rural North Carolina and was raised in a mill and farming community, where even if the crops failed or the textile industry changed, you didn’t just stop what you were doing.
“You adjusted and persevered because that’s the only life you knew. Even when times were hard, even when tragedy struck, you always found a way to carry on. And that’s what I did, too.”
