X1-crt center diff
 

Well its completly foobard yes I said it foobard I finally got my MMM contorller back after my first was lost in the mail, I put it all together and 2 min later I coud hear the motor but no go so I though maybe the pinion came loose, if it was only that easy.
pulled trigger spurs turnin just fine but no go so I ripped the center diff out cracked it open everything was stripped ond not only that it was also twisted to one side the whole inside the planitary gears were actually digging into the side of the diff case it took alot of force to straighten then pull it all out.

Well now that im done with my long story are most center diffs universal or do I have to buy one just for a x1-crt ?

They are not universal but you can use an x1cr buggyor crt truggy one...

some people use the gears out of the savage inside the diffs i recommend buying a new case and jammin gears and shim it they were probably just very worn from use

Allways keep an eye on those cross bars, my 528XR use to eat them for lunch! last time I rebuilt my diff I used kyosho bars with jammin spiders.

I suggest sticking wih the stock insides, but shim it very slightly cause they'll handle the brushless torque better.