It's time to upgrade my stock case PowerGlide with a new aftermarket unit. I have a blown alky SBC making about 800 with current tune. I may bump it up, sometime in the future. I have 33" tires, 4.30 gears and a converter that stalls 5400 on the brake. My current trans. has a 1.76 low gear. I'm wondering if I should get the 1.80 or 1.69 low gear. My trans builder says the 1.80's are stronger but I'm wondering if that will be a factor in such a light car.