At 70 MPH my 3:73 is running at 1900 RPM. Same day, I drove the 4:10 and at 70 MPH i was at 2200 RPM. There is a difference. Dad has the 4:10 and I get 11.5 when driving it mixed, I get 13.2 when driving mine mixed. I am not sure, but I think you can check the ratio in the door jam.

I have a buddy at the river who has the 6 speed w/4:10, and he gets 14.5 mixed driving. But he bought his in Nevada where you can get the 6 speed in an V10. I cant here, or I would have gotten the 4:10.