I recently purchased a all carbon/ aluminum TC4 from a friend. I went out with it today and it won't drift. I discovered that on the ground the rear wheels would not spin. When I hold the car up they spin just fine, but on the ground only the front ones are moving. An help is greatly appreciated!!!

sounds like to me that your rear differential is not catching....

Yes, sounds like your rear diff isnt catching. Take your diff cover off, Lift your diff out. On one side of the outdrives, Stick an allen key in and tighten to where it spins freely, but still grabs. play with it, Then tighten more if you think you need to. Your rear diff should be pretty tight, And your front should be a tad looser for a drifter.