A spool is a absolute engagement of both tires. If u look at Jeg/Summit you’ll see, there’s nothing to them. Thats because they lack the cluches, ect. to differ the traction to the needed wheel. A spool is a real pita on the street as well. Esp. if u have any kind of power…you’ll be going around a corner in the rain and slide the ass out without trying. Yeah, it can be fun…but, not when ur trying to pull into busy traffic.
posi= power transfer from wheel that slips to the wheel that grips
Locker= wheels start to slip, locker engages and give a 50/50 spilt of power to both wheels
Spool=Both wheels are turning at the same speed and are both getting equal power all the time. There is no disengaging a spool