0A-8 General Information Option Code Option Description W3L Final drive gear ratio - 6.143 (43/7) 16.5 inch hypoid W3M Final drive gear ratio - 5.125 (41/8) 18.5 inch hypoid W3N Final drive gear ratio - 4.556 (41/9) 18.5 inch hypoid W3P Final drive gear ratio - 5.125 (41/8) 16.5 inch hypoid W3S Final drive gear ratio - 5.857 (41/7) 15.5 inch hypoid W3U Final drive gear ratio - 7.167 (43/6) 17.5 inch hypoid W3X Final drive gear ratio - 6.429 (45/7) 17.5 inch hypoid W3Y Final drive gear ratio - 6.143 (43/7) 17.5 inch hypoid W3Z Final drive gear ratio - 5.571 (39/7) 17.5 inch hypoid W4A Final drive gear ratio - 5.125 (41/8) 17.5 inch hypoid W4B Final drive gear ratio - 4.875 (39/8) 17.5 inch hypoid W4C Final drive gear ratio - 4.556 (41/9) 17.5 inch hypoid W4F Final drive gear ratio - 5.125 (41/8) 14.5 inch hypoid W4H Final drive gear ratio - 5.125 (41/8) 15.5 inch hypoid W4T Final drive gear ratio - 4.333 (39/9) 18.5 inch hypoid W4W Final drive gear ratio - 6.833 (41/6) 17.5 inch hypoid W4X Final drive gear ratio - 4.333 (39/9) 14.5 inch hypoid W5M Final drive gear ratio - 4.100 (41/10) 14.5 inch hypoid W5V Final drive gear ratio - 6.833 (41/6) 16.5 inch hypoid Rockwell W5Z Final drive gear ratio - 4.89 (44/9) 18.0 inch hypoid Rockwell W6A Final drive gear ratio - 5.38 (43/8) 18.0 inch hypoid Rockwell W6B Final drive gear ratio - 5.63 (45/8) 18.0 inch hypoid Rockwell W6C Final drive gear ratio - 6.14 (43/7) 18.0 inch hypoid Rockwell Option Code Option Description W6M Final drive gear ratio - 6.43 (45/7) 18.0 inch hypoid Rockwell W6N Final drive gear ratio - 6.83 (41/6) 18.0 inch hypoid Rockwell W6R Final drive gear ratio - 4.30 (43/10) 18.0 inch hypoid Rockwell W6S Final drive gear ratio - 6.14 (43/7) 15.0 inch hypoid Rockwell W66 Disc wheel with step W71 Cab suspension - rigid type W8C Final drive gear ratio - 4.56 (41/9) 18.0 inch hypoid Rockwell W8D Final drive gear ratio - 6.43 (45/7) 15.0 inch hypoid Rockwell W8F Final drive gear ratio - 4.555 (41/9) 14.5 inch hypoid W8L Final drive gear ratio - 6.83 (41/6) 15.0 inch hypoid Rockwell X5J Manual transmission - MLD6Q X7W Manual transmission - MLD6S X9C Transmission - manual X9D Transmission - automatic YC4 Injection pump - high altitude compensator, aneroid type YK3 Rearward single tire YM9 Reversing warning buzzer YN1 Caution - Spanish YS1 O/S rear view mirror - flat type YT9 Pakistan KD special Y2C Manual transmission - MLD6W Y21 Light duty package truck Y3A Manual transmission - Fuller FS8209 Y3B Automatic transmission - Allison MD3560P Y4F Automatic transmission - Allison LCT2000 Y4G Automatic transmission - Allison MD3060P Y4V Manual transmission - Fuller FSO5206B Y48 Heavy duty package truck Y5D Manual transmission - ZF 6S1000