Jammin CRT Conversion
 

I converted mine to brushless and was wondering if anyone figured out how to put a bigger spur than the kyosho 46t?

I have seen some get a adapter made to fit the 51 tooth ofna gear on it.
With a small pinion you don't need to big of spur. 46 tooth spur with 9 tooth pinion. 5.11 ratio With the 3.31 gives you a final drive of 16.91 You could try a diff change in front and back to the 4.3 diffs.

I got a 10 tooth pinion on it running a 1940/9 on 5s lipo. The motor and the quark are getting pretty hot. Plus, I don't need that much speed, so I was thinking of changing the gearing to run a little cooler.

You could get a 9tooth and try if they 10 only seems a little to much.
If not an adapter or other means is needed.

If you like quality time with your dremel you can mod a 52T Savage gear and the 46T kyosho gear into one. Not exactly off-the-shelf but it works. :D

That's what I have been running in my CRT.

Mike made me an adapter to use a 51T spur, it works great

How much work are we talking about with the savage gear.

Line it up and drill. Not much, just need to make sure you get it straight. If i'm understanding the question???