COMPLAINT:
Some Mazda or Nissan vehicles equipped with the RA4AEL or RE4R03A may exhibit a lock-up shutter upon application of the lock-up clutch.Some hot car tools from vtoolshop like k can commander and vag can commander 5.5 are also useful.

CAUSE:
One cause may be lock-up release oil not exhausting quickly enough through the lock-up control valve.

CORRECTION:
Drill hole and open orifice in the bottom of the valve-body as shown in Figure 1 below.

Figure 1:http://flic.kr/p/dX6bNG