Fluid · Manual Transmission
Manual Transmission
for 1981 Ford F-150 300ci I6 · 4WD
Fluid Type
Type F ATF or 80W-90 GL-4
Spec: Ford M2C33-F or API GL-4
Capacity
3.5qt
3.31 L
Drain & Refill
3.5 qt
3.31 L
Change Interval
50,000 mi
80,450 km
Data quality
Book-style estimate
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Notes
NP435 4-speed or T18 4-speed manual. Ford specified Type F ATF for smoother shifts, but 80W-90 GL-4 acceptable for heavy duty use