GMC Workshop Service and Repair Manuals

Fluid - Differential: Capacity Specifications

Note on Heavy Duty & Light Duty Models

HEAVY DUTY:  Includes all models over 8500 GVWR.  G Series vans over 10,000 GVWR; and all P Series.

LIGHT DUTY:  Includes all models under 8500 GVWR.  G Series vans under 10,000 GVWR.

Light Duty Models

Conventional and Locking......................................................................................................................................................................80W, 80W-90* GL-5
*For vehicles normally operated in Canada, 80W only

CAPACITY, Refill:                                          
Front:

K-10/15, -20/25................................................................................................................................................................................1.7 Liters    3.6 Pints
K-30/35............................................................................................................................................................................................2.1 Liters    4.6 Pints

Rear:

Chev. 8-1/2" ring gear......................................................................................................................................................................2.0 Liters    4.2 Pints
Chev. 9-1/2" ring gear......................................................................................................................................................................2.6 Liters    5.5 Pints
Dana 9-3/4" ring gear.......................................................................................................................................................................2.6 Liters    5.5 Pints
10-1/2" ring gear

Chev...........................................................................................................................................................................................3.4 Liters    7.2 Pints
Dana...........................................................................................................................................................................................2.6 Liters    5.5 Pints

11" ring gear

Dana...........................................................................................................................................................................................4.0 Liters    8.2 Pints

Rockwell 12" ring gear....................................................................................................................................................................6.6 Liters   14.0 Pints

Heavy Duty Models

TYPE:
Standard & Locking...............................................................................................................................................................................80W, 80W-90* GL-5
*For vehicles normally operated in Canada, 80W only

CAPACITY, Refill:                                          
Front:......................................................................................................................................................................................................2.1 Liters    4.6 Pints
Rear:

Chev. 8-1/2" ring gear......................................................................................................................................................................2.0 Liters    4.2 Pints
Chev. 9-1/2" ring gear......................................................................................................................................................................2.6 Liters    5.5 Pints
Dana 9-3/4" ring gear.......................................................................................................................................................................2.8 Liters    6.0 Pints
Dana 10-1/2" ring gear.....................................................................................................................................................................3.4 Liters    7.2 Pints
Dana 11" ring gear............................................................................................................................................................................4.0 Liters    8.1 Pints
Rockwell 12" ring gear....................................................................................................................................................................6.6 Liters   14.0 Pints