Under-integrated elements are widely popular in the explicit field for their robustness and computational efficiency. However, their use in Implicit without appropriate stabilization methods can cause singularities and may result in poor convergence behavior. LS-DYNA offers parameters such as ISHELL, ISOLID, and IBEAM in the keyword *CONTROL_IMLPICIT_EIGENVALUE which can be used to switch to an alternate element formulation during an Implicit solution. All necessary mapping of element history variables is automatically treated before and after the switch. The switching of element formulation, when defined, is applied for all implicit solutions types such as eigenvalue extraction, implicit static linear, implicit static non-linear, and implicit dynamic.