In this thesis, we explain developing processes for hydrodynamic performance of torque converter to achieve the objective of forklift driving performance. Forklift is one of the dangerous machines which causes the fatal accidents most frequently. For safety, the creep speed of the forklift needs to be lowered. So, we predict the driving performance of the forklift according to the torque converter performance using Simulation analysis. Finally, we present the torque converter performance patterns to achieve the target performance.