Revo BL Conversion questions

[Sammus]

Theres a few things I don't quite understand - everyone seems to steer away from lower turn motors because they generate more heat, but I thought surely if your gear say a 7XL and 10XL for the same speed all other things equal, they would draw the same amount of power?

Secondly, I have a Revo 3.3 and I own a Mamba Max (early one) my current purchase plan is a RCM Revo motor mount, and a 10XL and a heatsink to suit. I was hoping to run 5s2p A123 cells, and gear the truck for about 45mph - so about 20/36 or something - does that sound right? I plan to do heatsinking and cap mods the my MM - but is it fully necessary?

And Thirdly, if I don't lock it in second, is it putting undue stress on the motor when it snaps into 2nd in the direct drive design of the RCM mount (as opposed to the TeknoRC clutch system...)?

Cheers! I'm sure I'll think of more stuff to ask! :P