I think if you went to a XL size can it would have the extra torque need to run the smaller spur, I have a 9L on my Rustler which is much lighter than a truggie, the KV speed equivilent of the 9l is a 6XL which runs reaaly hot on 4s I would go to a 8XL which is 2100 kv and you could gear up if you want extra speed but I think you might be happy with your 46 spur mated with maybe a 14-16 tooth spur