I replaced the rack and pinion and now the wheel is very hard to turn

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! It sounds like your Genesis is struggling to adjust to the new rack and pinion. You're right; an alignment and reprogramming of the electric power steering system are essential steps. The electric rack and pinion need to be flashed to ensure they communicate properly with the car's systems. This should smooth out your low-speed steering issues. As for the high-speed shaking, it's likely an alignment issue or perhaps even a wheel balance problem. Make sure the shop double-checks everything after the alignment and programming. If you need any further advice or if you'd like any help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554!