You will Love the savage. There are only a few things you will want to change out, but I have been running my 100% stock Savvy X for a couple of months with no problems.
The Savvy X comes with the 4 spider mod done, and the diffs can be accessed in 6 screws if needed. I have only taken the radio box off once since I bought it, which is a VERY nice thing with the savage.
When you get it, double check the spur gear mesh, as I heard some people got their trucks with a bad mesh, mine was fine from the factory tho.
And be sure to use the rollbar it comes with, as that will save you from scratching the engine. This thing can wheelie from the box, and as annoying as wheelies can be, your gonna do it once on tar haha, and then your engine will be all scratched up.
Any other questions on it lmk.
Is your arm broken yet? lol