2WD edition: optional supplied pinion QUESTION

[justatree]

How does the optional included pinion they give (the high speed one) due compared to the stock gearing?
How much faster?

 

[Walter]

It's math...

As an example:
Old pinion = 20 teeth
New Pinion = 22 Teeth

22/20 = 1.1 = 110% = 10% faster.