I was not talking about the whole diff unit, just replacing the insides with a mini spool or possibly a Trak Lok lunch box type locker.
VS just welding it shut, I'd rather not do on the smaller 9 inch 28 spline unit.
Now if I had the bigger 9.5 inch 31 spline I'd just weld the sucker.

But I've seen Dana 44s welded with 31s and had no issues with limited street use.
Montero 9 inch 28 spline from what I'm told-read and heard is as strong or stronger than a 44.

91 (Gen1) Monty, 3.0L V6, Auto 4 Door.
Disabled Driver.