Tube chassis car with 406sbc and 1.80 glide. Currently running 4.10 with 33in tire. Best et 6.07 in the 1/8th at 110mph. Not sure on the weight ,but it's light.

needs a 5 series gear for optimum ET. If wanting to max rpm in the lights than a 4.86 gear is the least you want.

Heck I run a 4.88 in my roadster with a 32” tire and 1.76 glide. I’m going through at 6950 @119 in good air and 6800 @117 in August air. 388 small block and footbraked.

quote:

Originally posted by 524vette:
Tube chassis car with 406sbc and 1.80 glide. Currently running 4.10 with 33in tire. Best et 6.07 in the 1/8th at 110mph. Not sure on the weight ,but it's light.

Depends solely on the torque converter. 6.07 110 mph at what rpm?

Gasoline or Methanol?

quote:

Originally posted by 1320racer:
needs a 5 series gear for optimum ET. If wanting to max rpm in the lights than a 4.86 gear is the least you want.

Thanks Ed, that was my thinking also.

The obvious answer just about anyone could surmise, even someone new to drag racing, is it needs a lower gear ratio.

If you want the advanced answer, in order to pre-determine how much lower and how much impact it'll have on performance, you look at the rpm at the stripe currently.