Hi the Tam Frog, Brat re-releases all do this... They are pretty sad, you need to insert o-rings in tranny outputs and in the axle ends this centers the shaft so it does not fall out, be careful not to add too many o-rings as it will impare arm movement at the point where the axle is level. It is really more or less a balancing act (not too much and not too little)
Hope this helps!
Don