Originally Posted by all4fun

h2daddy 1st off....good choice. The AE products work well and the (original) replacement parts are inexpensive, and they are also pretty resiliant. Also, you will be amaized how well these work when set up properly. I have an XRay M18T (similar to yours) and race it on our indoor carpet oval track 80ft x 36ft and it flies. It's powered by a Castle 8000kv brushless motor and a 7.4 2c lipo. Right now you probably won't need that kind of power on a smaller track. Let's just start out with the original motor and batteries that you already have. You can always put more money in it later if you want.
What I would suggest doing 1st is to slam that baby down. One of the reasons you are rolling over is your too high (right out of the box). To achieve this you need to put spacers on the shock shafts while you are assembling the shocks. I use about 4mm or 5mm of plastic washers equal in all four shocks. Your goal is to get 3.5mm to 4mm of ground clearance evenly under the chassis. This limits the shock (up) or (rebound) travel, thus, lowering the truck. Be sure your spacers aren't too wide. You want the inside of the shock body to hold as much oil as possible. Also, don't put any spring spacers on the exterior of the shock body. You want to stay away from preloading the springs. This changes what the spring is designed to do. If your truck is too low, just take one or two spacers out of the inside of the shock. Remember, your goal is 3.5mm to 4mm of ground clearance. This is the best way to lower the truck without changing anything else. My suggestion for springs is gold for front and blue for the rear. You want a stiffer spring in the front and a softer spring in the rear. Also, I suggest using 90wt shock oil in the front and 70wt in the rear in your original shocks. Use the shock pistons recommended (in the directions) for both front and rear shocks. I'm not sure, but I think they use 1 or two hole pistons in the front and two hole pistons in the rear. Your choice of already going to foam tires is better for carpet than stock rubber tires. They are also lighter (less rotating mass). My suggestion is something close to a 40 or 42 shore front and a 35 or 37 shore rear foam tire. I also suggest applying Paragon (my personal favorite choice) tire compound or what ever your track rules allow. Apply 1/3rd to the inside width of the front tire and full width to the rear 10 minutes before the race, then wipe off just before going on the track.
OK........now you have a pretty good basic setup you can start with. And you didn't spend a lot of money!! You may also want to adjust (steering throw) in your radio so the front tires don't have as much travel. You now have so much more (mechanical) steering we just put in the handeling of the truck, this may be needed. When you put a couple of laps in you'll be able to decide that for yourself. Note: If the truck "pushes" a little in the corners, you can apply a little more tire compount to the front tire or not as much if it has too much grip. Remember to trim the bottom of your body so it doesn't rub the track in the corners. This also effects the handeling.
Sorry if this seems like I just wrote a book, but I think this advise will really help you have a lot more fun with your "new Toy". Have Fun!!!!