Drive Train Gear Ratio

[Thorn]

Team 2869 used a mecanum drive train last year and it worked very well. We would like to the same for this year, but with greater speed (and less torque). The gear boxes we had last year gave us a 12.7:1 reduction (AndyMark touchbox mini) and we were able to modify these to bring it down to a ratio of 3.7:1.

We are missing some parts and it will therefore be a number of days before we can actually build the drive train and test it.

Do you think this is too low of a ratio? Will the robot barely be able to get started with a load on it with a gear ratio of only 3.7:1?
We have four motors, each independently controlling one wheel.