7 1/4 Rear End

SG= sure grip. Here's a way to find out the gear ratio. Make a mark on the top of one brake drum, and also on one end of the yoke. Turn the brake drum one full revolution, while counting how many times the yoke turns. 3 1/2 turns of the yoke will be a 3.55 gear...2 3/4 turns will be a 2.76, etc. No need to remove the cover.