Part Number 4QK3139 having (CAGE Code 76040) and FSC 2510 Vehicular Cab, Body, and Frame Structural Components in stock with ready to ship. Get an instant quote for 4QK3139 Spring Assembly Leaf by Mack Trucks Inc. Fill the form below with your desired order quantity, targeted price and the expected order-fulfilment date. Our dedicated account manager will get back to you within 15 minutes.