A bottom LTBG part which holds wheel (maybe part of portal axle system) - the differential is really higher than the center of the wheel. Hope some review with detail picture of new parts will come soon.
I will try to connect it this way
PF motor ->PF<- PF Extension wire->9V<- PF Extension wire->PF IR receiver
but it needs a lot of space, the 9V connection have to be rotated by 90 degrees :)
May I ask, what and where are these added instructions for 8455? Mine printed version (bottom left corner) is same as is on-line on service.lego.com. Sorry for little OT.