Stick with the Tamiya gears, you can run a bigger spur 85T, if you go to 48dp then the biggest you can fit under the cover is 81T. I run 20/85 on a 5 cell Mamba 7700.
When running the small pinions you generally have to modify (elongate) the mounting holes for the motor and also remove some excess plastic from the diff cover to allow the motor room to slide back to get a good mesh on the gears.
One point, If you run the standard chassis I think you will have to modify this to fit a Novak GTB
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