1988 SPEED0 GEAR USAGE CHART G1 2 3 THM 400 COht1hUGd D D A RG RG D IE IE A VA VA P TIRE SIZE AXLE TRANS E R ER 8 5 IllI 8 7546 5 EIIIII 8 75 16 5OOR 8075R 16 5 3 73 M40 08 8 00 16 5 8 00 16 600R 8 00R I6 6 E s a 8 7506 5 n T n 8 75 16 5OOR 8 75R 16 5 M40 08 8 00 16 5 nn 8 00 16 5OOR n T Q 8 008 16 5 nn 8 75 16 5 n Y I 8 75 16 500R 8 75R 16 5 4 10 M40 09 n u 2 8 00 16 5 8 00 16 5OOR 8 00R 16 5 T H 8 75 16 5 8 75 16 5OOR 8 75R 16 5 4 56 M40 NOTE 07 WITH ENGINE 5 0R L03 5 7K LO5 6 20 LL4 A 08 WITH ENGINE 7 4N L19 09 WITH ENGINE 5 7K LO5 6 20 LL4 350M LT9 1991 GENERAL MOTORS SERVICE PARTS OPERAT 0NS LT TRUCK 52G 4 450 4 94 1 91