Front Diff Problem

[xchange]

Hi guys,

I m new, and i buy a Dex410 2weeks ago.

Currently i build the car but i have a few problems.

The first : when i put the front diff on his case, i have a cracking when i turn the transmission.

I dont know where come from this problem.
If i remove the front diff from the case, the diff can be turn without problem.

Any one can help me ?

The rear diff dosen't problem.

Thanks !!

Franco