[G.M.]

The numbers stamped on the bottom of the bell housing won't tell you the ratio if the gears were changed unless someone restamped it. The easy way to check the ratio is put a vice grip on the drive shaft pointing up at 12 o'clock. Mark the tires or drum with chalk at the bottom. Roll the wheels forward one complete turn counting the turns of the vice grip. 4 turns = 4:11, 3 3/4 turns = 3:78 and 3 1/2 turns = 3:54. In the car mark the tires, mark the crankshaft pulley, put in HIGH gear and push the car to move the tire ONE turn watching the mark on the pulley. Same number of turns as the vice grips tell the ratio. G.M.