Gear recommendation

...as I'm just learning about all of this stuff, I had no idea that changing the rear gears would lower the RPMs at highway speeds.

I have a stock 318 with a 7.25 rear and 2.76 gears and always have white knuckles when I have to drive it at anything over 60mph. It sounds like it's revving way to high.

I'd like to be at about 2000-3000 @ 60-70mph.