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it should be cast aluminum. it would have to be very VERY clean and pre-heated, so the TIG isn't over stressed, but like 89 said and good welding shop should be able to do it.
 

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The cases are aluminum alloy. Aka, lots of other junk metal mixed in with aluminum. That stuff is quite difficult to weld. I think that someone who is competent with a TIG can probably get it done, but you'll have to talk to such a person first. I weld with different systems, but I only have very basic training in TIG.

I actually had a Cobra T5 a couple years ago that had one of those very ears broken off! I scored a good case off ebay for $15. Cheaper and easier than welding. :yelpleased:

EDIT: This might interest you: FORD MUSTANG T 5 TRANSMISSION CASE 87 88 89 90 91 92 93 GT COBRA T5 BORG WARNER
 

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just have to use the correct rod for such aluminum alloy, clean it very good, pre-heat and melt some metal
 

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I've welded a bunch of aluminum transmission cases. Some are easier than others. 4043 is the correct rod for cast aluminum. Don't be surprised if the weld has a bunch of pin holes in it where the weld meets the case. If the part that is broke isn't very large I would toss it and just build the weld up and mill it flat and redrill the hole instead of welding the broke part back on. It would be stronger this way.
 
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