That's absolutely right! I said over all final drive ratio in 1st. Meaning multiplying 1st gear ratio by axle ratio. A wide ratio box has a 1st gear, IIRC 2.73 and a close box is 2.42 IIRC. Multiply 2.73 X 3.25 = 8.87:1 Multiply 2.42 X 3.50 = 8.47:1
So you can see that by running a wide ratio with a 3.25 axle, you'll have a lower final drive ratio, meaning you'll pull away from a stop a lot easier. Then in 4th, you'll have a 3.25 vs 3.50 or about 11% lower rpms!
I'm not a complete idiot, pieces are missing.