AJ/FormS said

Yes; I spent 6 years in a major transmission rebuilding shop. I was on the Standard trans line, moving from beginner stuff, to farm trucks, to 18-Wheelers, to industrial. Along the way I learned to do rearends as well
This repair was quite popular. Not just for passenger cars but also for bigger stuff.
But hang on, your short stub input may be better suited to working with the ball-bearing type pilot that fits inside the convertor hub. I have seen a spray-welder make short work of building that pilot up. However, whether the hub of the 18spl disc will slip over the repair is another question.
Going from a memory in about 1980, Here's how our shop did it;
The machinist bored the Input gear about a half inch deep. Then fabricated a pilot extension to fit. Then Vee'd the two parts and while the parts were still on the lathe, it was precision welded by the Convertor welder. Afterwards the thing was brought into alignment with a lathe-grinder.
Now, I only saw this going on, in passing, as I worked on a different line, and my station was IDK, 20>30 ft away. So what happened to those inputs and similarly-repaired mainshafts afterwards, I cannot say. By the time they came to me, I couldn't even see the repair. I suppose they got some type of hardness treatment.
In my 6-year stint with that company, I cannot recall ever seeing a warranty for this type of repair. To tell the truth, I never saw any warranty work at all...... lol

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