A 1515 in a Jato?!?!
The 1515 is something people put in 10-15lb monster trucks/truggies, not a 4lb 2wd ST.
I hope you plan on metal tranny parts made! Have fun trying to get the power to the ground with that kind of power.
At the very least, you'll be able to gear up as high as you want for truly insane speeds.