Need help with rearend gears

New to this forum and Drag racing, but here we go.

I have a 3400 lbs 72 Ranchero that just had a 12 pt cage installed.

I have a 545 motor that hits 600ft tq at 3200 rpm and stays at 600+ till 6000 rpm with 650 hp and it runs on 91 gas ( Thats what California serves at the pump ).

C6 with 3000 rpm stall. (no trans brake)

29x10.5x15 slick (thats all I can get under it.

9 inch rearend 31 spline traction lock.

What gears should I use? Keep in mine I will run 1/8 mile most of the time and 1/4 mile part time.

Welcome...
I would say somewhere in the 3.70-4.10 range would be close.
If it is going to be a strip only ride, I would ditch the traction lock and get a full steel spool.
Hope this helps..

Welcome...
I would say somewhere in the 3.70-4.10 range would be close.
If it is going to be a strip only ride, I would ditch the traction lock and get a full steel spool.
Hope this helps..

Yes the traction lock will get replaced with a spool.

Thanks.

Keep us posted on what you end up with and how it works. Your final decision will depend on how hard you want to spin your motor.
Good luck with it.