R 3500 P/U 2WD V8-454 7.4L (1989)
Fluid - Differential: Capacity Specifications
Rear Axle Oil
With 8 1/2 Inch Ring Gear
4.2 pt (US)
With 10 1/2 Inch Chevrolet Ring Gear 7.2 pt (US)
With 12 Inch Ring Gear
14 pt (US)
Others
5.5 pt (US)