I'm going to start a project car soon. '69 fastback, pro-street/drag-car. Its going to have a 460 block, bored .030 over with a 4.5" stroke making it a 545. It will have p-51 heads with flat top pistons. Should have 13.7:1 compression. Single plane 1500-6500 rpm power band manifold. 750 cfm carb. I'm using a c6 trans with a 3000 stall torque converter and a ford 9 inch. What kind of gears should i use in the diff (what ratio)? thanks.

 

Figure out your redline and about what speed you plan on hitting. Use speed x gear ratio x 336 then divid it by tire diameter to get your rpm. That is the easiest way to figure it out. On my old race car, I ran a 10.07 at 136.77 mph. I ran a 4.56 gear with a 28" tire and it worked out great.

 

thanks, well the plan is to use 35 spline 9" axles with a Detroit locker rear end...maybe... and as for tires i'm not 100% sure... some kind of 275 drag radials possibly. I've never worked on or done TOO much research on drag tires, so i think your opinion would be more then helpful. what do you think?

 

I've never run a drag radial before. I ran the Mickey Thompson slicks. I do know quite a few guys that run the Hoosier Drag radial and they love it. One of smartest guys on the site is 2+2GT, he might have some experience with the radials.

 

Will do, thanks for the help.