I assume that your plan includes a full drivetrain replacement as well as chassis upgrades such as suspension, steering, and brakes.
I doubt if the transmission and rear axle will be very durable at the torque level you want to achieve. Remember that your car has an enclosed driveshaft. Any higher capacity transmission and rear axle will have an open driveshaft.
Plus the vehicle will be capable of much higher speeds than the chassis was designed to handle. Stopping and turning could be more excitement than you want.
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