2 piece driveshaft. Front half was shortend about 2 inches for the AJ16 / ZF (4hp24) drive train. Two peice was retained for smoothness. At 52 inches, it's just beyond the 48 inch threshhold most consider acceptible for a 1 piece. With the 3.54 gear and over drive that shaft is going to be high speed spinning so the smoothness of a two peice is worth the 45$ extra cost over a new grumbly 1 piece.