i really haven't looked at mine,almost ready to move and have a garage again,been 6 months with out one,this one will be heated and cooled and i hope the last time i have to move.i have noticed the same cracks on other trans housings though on other makes.i've never seen any leaks come from them.
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83 242 DL -127k, 92-965-189k, 94-965-200k, 83-242 GLT-Gone, but not forgotten,83-245GLT-1'st one (the 1'st 3 currently on the road)

don't worry about it, that's just casting flash in most of the picture. the small crack in the middle of the view might be where it was dropped on something at 1 time. that piece is just a dust cover/adapter for the engine trans connection. there is no reason to see fluid or anything else to come out of the "cracks". i trust all the bolts are in place, eh? good luck, chuck.

Dear p700walk,

Good p.m. and may this find you well. I'm no metallurgist.

Unless you see evidence of impact damage to the housing - scuffed areas, deep scratches, chunks of metal missing - I suspect these are casting flaws.

There appears to be no fluid leakage, which suggests that they do not go all the way through.

Not having eye-balled my 940 tranny recently, I don't recall if the torque converter is positioned such that it is exposed to road hazards, i.e., a rock bouncing up and hitting the housing.

I'm pretty sure that anything that would hit the housing hard enough to crack it, would have done pretty severe damage to the pan and nearby areas.

Are there any signs of impact damage to the underside of the car, i.e., the oil pan, and the underside of the floor pan?

If not, these are likely casting flaws. They are likely to be problematic, only if the casing takes a direct hit from something very hard, and sizeable, at great speed.

I'm curious to know if others wiser in metal matters know more.

Hope this helps you to sleep a little better, at least until we learn more.

Yours faithfully,

spook