Hello Guys I have a 84 chevy scottsdale P/U 4x4 with a 350 Big block motor I plan to swap the motor out and insert a Duramax 6.5L Diesel with an Allison 1000 Transmission 6 speed Manule does anyone knows if I would have to change the rearend or install a computer chip. Any advise will be very greatfull or should I just keep it gasoline.