Discussion Forum - Northstar Chevelle Club

Photo's are hard to tell, but those lines almost look like parting lines from the casting process... but like I said, the photo...

Give this a try:
(photos 1 & 2) Use some fine sandpaper and dress down that line a bit, then remove the mount from the pad, and re-thread a longer bolt (like a 3") into the hole, and very gently put some pressure against it perpendicular to the "crack". See if it opens up a bit.

It does look like a small crack coming from the dowel pin on photo 3, but again it could be a parting line or "flash" from the casting mold.

Looks normal to me.  It has to do with the polish on the die casting tool.  Trans housing's are a 'rough' casting, and unless they are machined they will have this type of finish where you can see some of the lines from the tool in the part.

You can see similar lines elsewhere in the casting pics.  I wouldn't say that these are cracks, just lines from the tool.

If you're still concerned, you could do as J.D. says and do some fine sanding to see if the line goes deeper into the material.

Or, if this is an injection casting, it could be a 'knit' line where the material flow comes together in the tool.  This happens more in a plastic injection molding process though.

Ditto what others have said. That's your typical crappy Muncie casting. I've seen some much worse then that. But agian, it's just the casting and nothing to be concerned about.