A 3500kv motor can work, but it really depends on the physical size. A small motor won't have the performance you want without overheating unless you gear for ~5mph.

It's kinda backwards to get just any motor and then try to get it to work.

What should be done first is figure out what battery you want to use. Higher voltage is better for efficiency and the upper limit will be determined the highest voltage the ESC supports and by your wallet.

Once you know the voltage, you get a motor kv that matches it. Different motors have different rpm ranges. Feigao motors tend to do best at around 30k rpm max. Neu or similar motors can go much higher, but most stick to around 35-40k rpm. So, let's say you want to use 5s lipo and want to run a motor at 35krpm; the kv=35000/18.5, or around 1900kv.

Then, you pick the size motor for your application. Lighter/smaller vehicles can use smaller motors just fine. But for a T-Maxx convert, I'd stick with a larger motor, like a Castle 2200kv, Neu 1515, Feigao XL, etc.