My face HURTS from palming....
Ignore my "opposite" post that came first after your question, sorry for confusion.
JB weld may work honestly but it would be a big gamble with an essential part of your drive train that may cost several thousand dollars to replace if you run it out of fluid and burn it up all from a leak.
You could try it, depending on where it's leaking, but replacing is probably your best option. You could also find leaking section and cut it out, then get proper fittings and flare it for a new section, but again, just more shit to potentially leak.