12-12-2016, 08:53 PM
It's a tough one with regards to the back axle ratio as normally larger axle from big vans and 7.5 tonners have a ratio of 4.5 upwards,
the other option is go to the scrappers and remove the whole rear subframe assembly from a 530d bmw, they have a ratio of around 2.5 and the post 2011 cars can handle 550 + ft.lb, the gearbox you have out of the leyland roadrunner will fail earlier than that.
the other option is go to the scrappers and remove the whole rear subframe assembly from a 530d bmw, they have a ratio of around 2.5 and the post 2011 cars can handle 550 + ft.lb, the gearbox you have out of the leyland roadrunner will fail earlier than that.