Cadnaan Ali, 19, of Overton Road, drove the victim from London to Luton where he had arranged for two other men to ambush the car.
Ali then joined in as the three of them attacked the victim before holding him for the next days in various addresses in Bedfordshire, Hertfordshire and London.
He was forced to transfer money to various bank accounts, totalling £77,000.
The victim eventually escaped but Ali continued to harass and threaten him into not calling the police.
Ali was convicted of kidnap, causing actual bodily harm, two charges of theft and two charges of perverting the course of justice.
He has been sentenced to eight years and two months in a young offender’s institution.
Detective Sergeant Richard Marshall, of Bedfordshire Police, said: “This was an exceptionally violent attack, executed with weapons for financial gain.
“The offence clearly shows meticulous planning, and when Ali lost control of the situation, he resorted to threatening the victim in a desperate attempt to evade justice.
“The victim has shown immense courage by coming forward, and I am pleased for him. The lengthy sentence handed to Ali sends a strong message.
“We believe Ali has been deeply involved in serious violence and gang-related crimes, and we will continue to do everything in our power to bring such criminals to justice.”
