Attack of the Clones...

[suicideneil]

I'd definately say change the connectors- 5.5mm ones are more than fine, and easier to solder/ find heatshrink tubing for too.

I have the 1845kv motor (9XL), and currently run 24/70 on 5s lipo, so I think for your 3905 truck and 14 cells, something like 24/68 comes out at 35mph, which I believe is about the best you could hope for really using nimhs and a large BL motor. Depends though, the lighter the truck, the higher you can gear slightly, so 65/24 is possible, just watch the battery temps closely more than the esc and motor. Good luck.