Product Name: 4X4 POSI LOK PSL500 Acuator 1983 2003 Chevrolet S10 Pick Up and Blazer 1983 2003 GMC S15 Pick Up Sonoma and Jimmy; includes ZR2 and Highrider; Positive Axle En
4X4 POSI-LOK PSL500 Acuator: 1983-2003 Chevrolet S10 Pick Up and Blazer 1983-2003 GMC S15 Pick Up Sonoma and Jimmy; includes ZR2 and Highrider; Positive Axle Engagement Systems; vacuum actuator kit PS