489 3.91 for 489 3.23

I’m looking to trade my sure grip 3.91 3rd member for a 3.23 sure grip 3rd member in good condition. 489 for 489. This rear end was completely rebuilt 15+ years ago, but has less than 1000 miles(car sat). Located in Phoenix, AZ.
I’ll do my best to answer any questions, but my knowledge is limited.