Here it is from amain, You can use the part number to find it else where. http://www.amainhobbies.com/product_...inion-Gear-11T
maybe it's time to look at a new motor. Most guys have found the align 500mx to be equal or better than the scorpion 1600. I have not seen anyone talking about any better motors right now.
For speed with a 12t and full battery no load your looking at 3665, but the calculator I use take into those factors. Under load you could see 3200 and that is what the Align 500pro manual list as well.