[lincpimp]

OK, 1st of you cannot have mech brakes and motor reverse. You need to have the hpi reverse module installed, and use a 3rd channel to engage it. So if you plan to have mech brakes and want reverse that is what you will need.

Since you do not plan to run a body you will save a fair amount of weight. I plan to run a 5t body and will make a roll cage so I have alot more weight to think about.

I would say that if you run the std savage 2 speed tranny with the upgraded heavy duty disk brake setup, you will be ok running the 1717 and MMM on 6s, as long as you gear for around 40mph. I ran a std savage with a 14xl on 8s with a 60hv esc and it did fine geared for 40 with the 2speed. Your savvy will be heavier but will have twice the power potential with the 1717/MMM combo. You may be able to get away with the single speed flux tranny, and you can run disk brakes with that tranny with the disk brake parts from hpi and the correct rear tranny output coupler. I would be careful with gearing and check temps alot.

If you go with the single speed I would give motor brakes a try, might work just fine, and save the added complexity of mech brakes and mech reverse. You will need a good lipo to handle the increaded voltage going back in during hard braking.