my transmission slips at takeoff and shifts hard

Hello, There was an issue with the L300 concerning the shift solenoids and pressure control for the transmissions in the L series sedan/wagon. If your check engine light, wrench light, traction control, or ABS light are on or flashing when the issue presents itself, you will need to have those lights/trouble codes diagnosed. If not, you may end up replacing many good components before eventually happening upon the correct fix. Here are certified shops in your area that can help you with the diagnosis and/or repair: http://repairpal.com/saturn-within-10-miles-of-sioux-city-iowa-51106