My F model 1800 has factory tach, its spot on 3000 rpm at 70 in 5th gear. You can do 70 in 3rd, but as previously stated your rev Limiter wouldn't let you do it in second. The 1800 sounds more wound up than it is, I think it has something to do with the dual pin crank.

1. On Which Speed Do You Switch Gears 4 Gear 3

• How to pick a gear ratio: To illustrate my point, let’s look at my 1967 Chevy C20 pickup: The truck has a 375 horsepower 350 with a decent cam and a full exhaust. Power is transferred to the super tall tires via the 4 speed Saginaw manual; and her big ol’ butt tips the scale at right around 4,800 pounds.
• May 25, 2017  Your gear does not define your speed, your throttle input does. It is advisable to shift up a gear whenever your engine is making too much noise because the revs are rising too much into the red line. Do not do that if you don’t want to damage you.

On Which Speed Do You Switch Gears 4 Gear 3

.Our navigation.How To Change Car GearsGears allow a car to be driven with the minimum strain on the engine.