Spider gears on an open rear. Actually a 7 1/4 SG is a lot stronger then people realize. I ran 7 1/4 rear for years in my drag/street cars. 3200 lbs weight, slicks and nitrous. high 12's, low 13's. Never broke one, but did wear out some SG clutches. "Back in the day" there were lots of ratios available. 3.91, 4.10, 4.56, 4.88, 5.13, and I was told, but never saw one, 5.38
