What rear end gear ration is a 1966 Chevrolet El Camino?

Answer 1

Without taking the rear end apart there is no way of knowing exactly whar reatio you have. But you can get very close by doing the following. Put the car on jack-stands with both rear tires off the ground by an inch or so. Put a chalk mark on the lowest point on the tire. Put a mark on the ground in line with the mark on the tire. Crawl under the car and put a mark on the bottom of the drive-shaft. Have a friend slowly turn the tire one revolution while you count the nu;mber of times the drive-shaft rotates. The car must be in Neutral so the drive shaft can turn. You'll probably get three and a bit more revolutions. Three and a quarter would indicate 3.25 gears, three and a half 3.50 gears, etc. Not perfect, but close enough.