TREX Main Drive Gear

[HawkerDriver]

I've got a quick question about the main drive gear on my Trex. I've noticed there are three different colors; white, light blue, and dark blue. Do the colors mean anything? Is one better than the other? Will the ratio's be different? Does the color designate the number of teeth? I'm basically looking to increase my flight time and I can't find information on the drive gears.
Thanks!

[BarracudaHockey]

I'll point Finless to this post I'm sure he will know.

[Pinecone]

I already answered one of his other 4 - 5 identical posts. :)