cast iron or cast steel??

It is cast iron. Are you going to do the weld repair yourself? If so, you will need to be able to heat the whole case up, weld it hot and then slowly cool it after high temp stress relief. Ni rod.

If not thermally treated, you stand a great chance of it spontaneously cracking again right next to your weld line.

It might be cheaper to replace the case. My trans had cracks that were repaired and re-cracked b4 I bought. I repaired them, they recracked, so I replaced the case. It was a "DOH!!" moment as I found the replacement case for $75.

jb

Where is the crack?

I have an 8" weld on my 2n's cast iron oil pan.. never had a problem with it.

As another poster stated.. is this a place where epoxy might be used?

In a non pressure area on my center hyds section i had a crack on my 8n.. someone brazed it, then sanded then polished down... never been an issue.... so braze / silver solder is a possible idea.

Soundguy