GM to Mopar trans swap?!

AJ/FormS said

Was that a fully synchronized A-230? That 230 has a generous mainshaft. Where did it let go?
If you can break one of those, the only cure is an a-833.
That 84Buick is a FWD. The last year of the 5 speed was 1980.And it was designed for 110, countem 110 ponypower.
The FWD 5spds were designed for 80 to 90 miserable ponies.

What in the world are you thinking?

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Not very knowledgeable about things like that, I know a lot about things I own or like but as far as those old 4cyclinder fwd cars I have no clue. My duster has been in my family for 40 years. Bought by my grandpa and driven by my dad and aunts and uncles in high school. I'm just taking in any option I possibly can because I'm on a tight budget and I really want to get it running again.