I'm about two steps away from having the car finished (for now - you know how it is), and one of those steps is a gear swap in my 8 3/4.

Right now, I'm running 3.23 Sure Grip in a 489 case (freshly rebuilt, green bearings, axles, etc.) - which I know are completely the wrong gears for my setup.

I've got a 413 that is putting out about 450 - 475 to the crank. Power is going thru a built 727 Torqueflite with a 9.5 inch California Converter by Art Carr TC. Stall is around 3,800 RPM.

You can see that makes for an interesting combination with the 3.23s! It just won't lock up (which goes without saying). Fortunately, the thing has never heated up or been flogged.

I need the gears to make the combo - so my thought is going with either a 4.10 or 4.30 ratio. Car is for the street. Very little highway driving. Occasional blast down the 1/8 mile.

Any thoughts on the gears to get here guys and gals?