Traxxas slash 4x4 ultimate upgrades
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The only other upgrades that mine has are Proline Trencher 2.8 tires on 2.8 Desperado wheels, aluminum shock caps, upgraded shock shafts, and RPM arms. I geared mine conservatively so that it'll run 35-40mph, but still give me 45 minute run times and never get over 120 degrees. I upgraded my ESC at the same time, but I think the stock ESC will do fine with that type of motor unless you gear it to the moon. All you'll need is the motor and a 5mm 32p pinion. In my case, I went with a 2600kv 1/8 scale motor. To make it better than what you can accomplish with the stock running gear on 2S, in my opinion you need to move up to a lower KV motor. A slash has a little bit smaller tire mass & diameter, so you should be able to gear down enough to keep it comfortable on 2S, but on 3S you're still going to cook the motor. Even on 2S, with a 10 tooth pinion (which is about as small as you can fit), my Stampede ran hot. As I mentioned above, the stock Velinion motor is best suited to 2S. When I upgraded my electronics for full time 3S use, I had to put the Mip X-Duty driveshafts up front too. I bought my Stampede with Mip X-Duty rear driveshafts, and every single time I ran 3S I'd break a front stock driveshaft. If you've upgraded the rear driveshafts, you can expect to tear the front driveshafts up every time you run 3S, so you need to upgrade those too. You'll tear out the rears ones eventually, and maybe even the front ones from time to time. On 2S, the only essential upgrade in my opinion is rear driveshafts. On 2S, you'll run 30mph, which is fast enough for almost any bashing situation. To be honest, 2S is what I consider the "sweet spot" on that vehicle unless you upgrade to a lower KV motor to do 3S. You're going to destroy the driveshafts, and most likely you'll continuously overheat the motor and lock it up.