Ugh mines all scrwed up some1 help me!

[labelchild]

Ok so i was messing around with my xmods and i had stage 2 drift motor with soft tires and whenever i would turn the tires had a way of slipping off the wheel so i well, glued the tires on the wheel so i could drift like mad. Shortly after this my car started going REALLY REALLY SLOW but the motor was doing max revs. When i got my car off the ground and turned one of the wheels the other wheel didnt turn which means something is slipping differential wise. So today i bought the AWD kit cuz it comes with another back differential. I put it in and well still doesnt fricking work, tried over and over added grease everything it just is fricked up.

Any ideas im desperate.

[slugbugg]

Heres what I do when I have a problem like that.

I start at one end of the driveline, motor pinion is a good place to start by making sure it doesnt slip and closely look and test each part untill I find the slipping/broken part.
You dont have to take the whole car apart (then again you might) you just have to verify each piece.

[4G63T]

and also check if there is any hair or dirt

[aperson]

if you got ball bearings make sure one of them didnt sieze. that happend to me yesterday. i would take the whole rear end out and thoroly clean everything to make sure.