Drive Shaft Slipping
 

One of my drive shafts slips every time I turn, and I don't know what to do. I have the four wheel drive upgrade, I need help...fast!

You mean the differential cups or the axles ? Which one is skipping ? Front or rear ?

Either way, you can't do much about it. Replace the parts. GPM will last but is a bit more expensive. Plastic parts are cheaper but break easier.