[TheMan5952]

I'm don't know to much about Bel Airs. But for street gears, if your nto running at the track I would run some thing in the high 2 - low 3 range (like 3.13 if they make it) it would get you gas milage on the street and highway. And 700R4, I hear they not to good in high power applications, so if you not runing high horses then you should be alright, the TH400 works real good also for a 3spd auto.