I have the metal drive shaft no problem with the screw but I will be making it shorter ,i emailed the company about a slipper and a few other parts but didn't get back yet.its a shame that they don't email back because it is a great truck but can be better.but I read that if u race rock racer the middle diff has to be locked anyway.
I put the upgraded chassis looks nice never broke the stock but couldn't resist putting it on