genericuser You'll cook the ESC if you do this and you'll run higher risk of damaging the diffs, even if you shim the pinion mesh perfectly. It's an old design and it isn't super durable. Consider using a 3 or 4A lipo and you'll have runtime and power that suits this design best.

genericuser Just a guess based on running it and compared to others, 45T might be about right. Don't know though.

genericuser It comes with the diff locking pins in a small bag of tools, yes.

genericuser Yes, there are several conversion options. Look on rccrawlers forum in the Bruiser section. You can also 3d print your own adapters (search 'p407' on Thingiverse). EBay sellers have adapter kits.

genericuser Look on rccrawlers forum in the Bruiser section. There are a few options. Can 3d print adapters (search Thingiverse) or buy adapters, or buy compatible wheels if all else fails.

genericuser I've had this exact device for about 2 years and it has daily use between several devices. Over time it's capacity has declined, which is unavoidable, but it's an absolute beast and easy to recommend.

genericuser 1s should give nearly double the flight time of 2s at the same rated capacity (eg. A 500mah 2s should fly about the same time as a 250mah 1s, though in practice battery sag on 1s may mean real world results aren't quite as tidy). In general though, less cells equals longer runtime.