Thanks for all this great advice!!

Less power is not an option. In fact this motor is my “training wheels” motor while I slowly work my way up to Overkill / Chainsaw levels (easily several thousand more watts)

My basic goals are being able to run 2 battery packs back to back without going over 175 degrees, with 6.5” tires and a top speed of about 65mph on medium length grass. I have most of the above already, except for being able to run multiple packs. Still need to grind down my motor mount so I can get below a 15t pinion (13 might be just right).

I am waiting for the m2c diff case to be in stock and then I will try that.

For now I think I will up the diff fluid to about 300k and keep increasing until the diff doesn’t overheat.

Anyway thanks for the advice - very helpful.