Owner's Manual
Page 364
... refd add 4 ounces (1 18 ml) of NLGI # 2 Category LB or GC-LB. Chassis Lubrication Rear Axle (Standard Differential) I SAE 75W-90 Synthetic Gear Lubricant (GM Part No. 12378261 or equivalent meeting requirements of NLGI # 2, Category LB orGC-LB. Chassis Lubricant (GM Part No. 12377985 or equivalent)or lubricant meeting GM Specification 99861 15. USAGE...
... refd add 4 ounces (1 18 ml) of NLGI # 2 Category LB or GC-LB. Chassis Lubrication Rear Axle (Standard Differential) I SAE 75W-90 Synthetic Gear Lubricant (GM Part No. 12378261 or equivalent meeting requirements of NLGI # 2, Category LB orGC-LB. Chassis Lubricant (GM Part No. 12377985 or equivalent)or lubricant meeting GM Specification 99861 15. USAGE...