Well I suppose the Traxxas one will work, but I think you should find one with some more features. I can't tell you how many times I've said, "man I wish I had gotten the one that does THIS also"
A good charger is definitely worth the time and money, you just cannot rc without a good charger...
http://hobbyhobby.com/store/product/334730/Onyx-245-AC-DC-Dual-Charger-w-Balancing/
That one does two batteries at once even if they're different types. But it only does up to 3s LiPo. Which is fine, the one you have is a 2s.
It may be quite expensive but it is a quality charger.
Okay so The lrp engine is awesome, but now you can't get a pullstart for it???? Lrp and associated are now "separate" and it looks like they're discontinuing the lrp nitro engines. Great, just great. I got a $160 engine that runs fine but is unfixable because I can't get a pullstart.....
So its a 5000mah LiPo then. The big plug with the two wires is the main plug/wires, and the small plug with the small wires is the balancing wire. Make sure that is plugged into the correct port on the charger when you charge it.
And make sure its set to LiPo, up to 5 amps. Then you're good to...
Arms, same tranny, same except its only a two speed I think. Spur/slipper assembly will also fit along with the radio box, shocks, engine mount and plate
so you mean the wheel hex in the rim stripped out correct? If so then you need a new rim.
The threaded part that it sits on is really just called an "axle" go to ebay and out in "savage axle" it'll probably come up