It looks like the elusive leak on the trans of the New Yorker is coming from the aluminum housing where the cables go in the trans. Looks like a hairline Crack. Anybody ever fix one of these things sucessfully?

No actual exp but if I was faced with that I would drain the pan to get the fluid away from the crack then drill a small dimple partway in on each end to stop the crack from spreading then more dimples in the length of the crack between the ends then clean it thoroughly with brake kleen then fill it with JB weld. (maybe drill all the way thru) I am just strickly thinking out loud & someone may have a better solution but here is a BTT for ya & I would call a welding shop & pick their brains & there are some experienced welders on here also

is this on the tailshaft housing where the park cable is attached ? if so, that piece might be tricky to weld up as it is pretty thin from my memory. any warping would require some resurfacing of the mating surface. not sure how much you could remove without causing problems with the cable operation. do you have a pic of the problem area ? rapidr might have the best solution depending on the part and severity of the crack.