More Gear
 

Definitely more gear,if that is all you are turning through the traps,4900-5000 is no where near the peak of your engine with the mods you have.

It will be a world of difference between 3.55's and 4.10's most of the time there is a 200rpm increase in between gear ratio changes so figure just figure to might be turning 5400-5700rpm through the traps.

I think with 4.10's would put you right in the fat part of the range.