Okay this time it's not "Convert" but rather changing the whole part or the whole set.
Got myself an original halfcut GTR32 rear wheel hub. The wheel bearing is a little off so I bought another wheel bearing for it separately, else I can hear a bell ringing or clink clink sound for my rear wheel when it's spinning.
I remembered before changing it with 4 studs the bearing itself also in a bad condition. Literally can feel some small restriction especially when putting it in free gear and let it roll. It's like there's 2 to 5% braking, or a better example It's like you're running while holding a bag of groceries lol.
After changing wheel bearing it's the car feels much smoother and want to dive forward more. Especially during a slope it will roll downhill instead of slowing down.