Fluid · Manual Transmission
Manual Transmission
for 1966 GMC Panel 261ci I6 · RWD
Fluid Type
SAE 80W or SAE 90 GL-1
Spec: GM Part 1050169 or equivalent
Capacity
3.5qt
3.31 L
Drain & Refill
3.5 qt
3.31 L
Change Interval
36,000 mi
57,924 km
Data quality
Book-style estimate
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Notes
3-speed or 4-speed manual. Saginaw or Muncie variants, use non-GL-4/GL-5 gear oil or Type F ATF per some GM guidance