Ahhhh, that is a suspension part with a crack in it. I would be very worried about it! There a was post a little while back about a car that dropped the differential while going down the highway...that is bad enough.

I would be afraid the diff would drop, maybe pull the drive shaft loose allowing it to stab into the road and the car start turning flips. Had that happen in a car I was riding in about 35 years ago...it did not flip but the rear end came about 5 foot off the road, came down hard, and bent the frame, ruined the car....we doing about 35 MPH...at highway speeds it would have gotten bloody.

I would be worried. I would at least find me a WELDER and attempt to weld in a brace. Again, I would be WORRIED.

__________________
Mark
1983 300TD Wagon
Even a broken watch is right twice a day