On-road BL project

[MetalMan]

How about a Mamba Max? It should work very well. Based on what Batfish used, the Mamba Max with the 4600 motor should work excellently.

[Batfish]

One other note for you with the Jato - the Mod .8 spur gear that Traxxas uses on the Jato meshes up with standard 32 pitch pinions just fine. I ran regular Robinson 32 pitch pinions on a 48T Mod .8 Jato spur for 3 months with no noticeable wear.
If you wanted to go to Mod 1, the Revo spurs bolt right on to the Jato slipper assembly. It reduces your gearing options overall, but does give you the ability to easily use Mod 1 if you want.

Yet another Mod 1 option is the Associated MGT spur gears. The slipper peg holes line up with the 3 slipper screws for the Jato. This spur will stick out a little further than the stock spurs, so make sure your motor shaft is long enough and the pinion will reach. This option does require two modifications, though. First, the center hole has to be shaved out a tiny bit (maybe 1mm - I did it with my dremel and a sanding wheel) to accomodate the bearing it rides on. Second, one of the screws that hold the rock guard comes up right under the spur gear and will interfere with any gear larger than the stock Jato 48T. If you remove/relocate that screw and cut off the plastic nub, you can use a larger spur.