Do you have a tach on that motor? Depending on tire size a pressure oil 235 should drive it a lot faster than 40 even with 4.11 gears.

The screaming may not mean much.

I have a truck, granted with a modern motor, that has 4.11 gears and will easily run 80 mph plus (pulling a loaded trailer). While it has electronic ignition instead of points, internally its just a push rod motor and I doubt turns significantly faster than a good running 235 can.


1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...