ORIGINAL: mazdaprotege4
You should see if you can make the diff from the nitro 4-tec work in the electric 4-tec
It will work. eBay has sellers that sell complete diffs with bearing and gears and even the tension cams. If you have the right front diff case (the one that can hold the larger bearings) then the nitro diff conversion will be a breeze.
Just keep in mind that the larger diff pulleys will create extra tension in the belts. (at least, it happened only to me)
Also will a 200mm body fit on my 4-tec? It came with some Ken somthing S15 body?
Yes and no. Yes, if you keep the stock electric arms on but you would need some crazy wide offset wheels. The stock width is abut 185mm. No if you have the nitro arm set up. With the nitro arms, the wheelbase is shortened and the wheels don't line up with the wheel wells. The body itself will fit the chassis, but having part of the wheel hiding behind the body...