yeah my plan is to replace with a cheap axle, so cutting the nut off is an option. this car is now a winter beater + truck replacement, so low mileage. plus idk if it will even last another year due to all the other repair costs that it might, does, and will require
to everyone else that commented, thank you for the advice
I will give another shot tomorrow and try to actually clean the rust at the end of the nut off, ran out of time today. it didn't budge at all, but this impact really is much lower power than I'd hope. my 1/2" breaker bar looked like it was ready to pop just from what I could apply by hand. I'd tried to pry the staked material out, but there was so much rust I couldn't even tell if any was left to begin with, and my tool was too large - I'll drill it a bit tomorrow to clear the rust out of the keyseat