you need to read capt-n-crunch's post about twin torsens
https://www.astrosafari.com/viewtopic.p ... 9&t=124738
I'd want you to get it from him, not my bad memory.
I dunno what Jeff can do.
I'd just get a junkyard front diff, if yours is bad. To give you time to read.
I wouldn't bother with front stuff til the rear is sorted out. A locker, torsen, etc.
The time to learn is always well spent. I sorted my desire for a rear posi for under $200. A front posi will always be expensive. As much as I like to spend money, I won't be doing a front.
Search first for info on cast front diff. I could be wrong, but I don't think so, about all cast diffs being 3.73s.