Ok, so i need help, last night on my way home from school, 12am, i got in my car and started it, put it in drive ,all good. I then went to talk to someone, put it in neutral and it wanted to move forward still. Didnt think anything of it, put it in drive and left. Then it would skip around on the shifts, and i noticed a humming/growling sound proportional with road speed, not engine speed. Kept driving and the skip shifting went away, but not the noise. Me and my brother rebuilt the tranny 30k ago and everything has been great since then. It has a zzp shift kit in it, and i read on trannymans website that it might be the differential and rear planet gear going bad. Any suggestions?