Fluid · Rear Differential
Rear Differential
for 1965 GMC 2500 Series 261ci I6 · RWD
Fluid Type
SAE 80W-90 GL-5 gear oil
Spec: GL-5
Capacity
4qt
3.78 L
Drain & Refill
4 qt
3.78 L
Change Interval
50,000 mi
80,450 km
Data quality
Calibrated
Platform-calibrated book-style value. Verification program ongoing.
Notes
Full-floating rear axle. Capacity varies by axle ratio.
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.