Hello Gene,
Recent research has (the 1959 Chev truck manual) shows that:
the 3100, 3200, 3600 and 3800 have a 1.37 internal diameter steering cylinder
- the 4000 thru 8000 models have a "2" internal diameter steering cylinder
-9000 & 10000 models have a 2.375 internal diameter steering cylinder.
Those models have different flow rate pumps to correlate with the ram.
Check out the manuals and they may give you more insight
Mat
