A suspension lift system for golf carts includes a carriage, a welded front frame attached to the carriage, upper and lower arms symmetrically arranged at opposite sides of the front frame, a rotatable apparatus, a steering knuckle and an absorber. Each upper or lower arm includes a first mounting side pivotally connected to the front frame, and a spindle connection end opposite to the first mounting side. The rotatable apparatus includes a bracket including a pair of lugs and a receiving space formed therebetween for accommodating the spindle connection end. The spindle connection end and the lug are threaded by a pin in order to combine the spindle connection end and the upper bracket.