Cracks in bell housing.

[Busterroo]

I have a 2006 Ram 1500 with a 3.7l and auto transmission. While replacing O2 sensors I noticed some cracks in the bell housing. All over it. One is pretty good size. Has anyone else have this problem?

 

[Daw14]

They look like casting cracks . Shoot it with some brake cleaner , I bet they stay dry . It’s not dripping fluid is it ?

 

[G-Ride990]

Only the first pic looks like something MIGHT be going on, but I wouldn't worry about that one.

The rest of those pics are casting flash. Excess material during the casting process that is left in areas that don't affect the function of the part. You will see this kind of excess material in all sorts of plastic and metal parts. Pick up a plastic pen sitting near you and you will most likely find an imperfection on it from a used mold.