Well, if you go 4s then the first thing that will break will be those wimpy plastic rear axles. Here is a link to an upgrade that would be bullet proof. https://www.amazon.com/gp/product/B004AFHDGU/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
Let the money pit rabbit hole begin. 😂
My Rustler 4x4 gets sloppy on 3s but does take it well (was Castle 3800, now Castle 3200). I wouldn‘t bother putting anything more powerful in a 4x4 Rustler unless you are willing to spend some money replacing parts and making modifications. When I ran the 3800 in it on 3s it was a rocket and...
@KenBossio , Sound advice here from Greywolf74. Do what Greywolf74 has pointed out. The Castle 3800 is a beast on 3s in a 2wd traxxas platform. It will be too much power I assure you. Also, aluminum suspension parts are expensive and will just transfer the crash forces to other more critical and...