My only advice would be if you're going to change the tranny stay far, far away from a dealership. Buy a used one with 3 mo. warranty from a wrecker and have a local mechanic change it for you. I'd guess(just a guess) a new aluminum/alloy tranny is likely thousands; one out of a wreck with warranty will be hundreds. I'm certain others may disagree with that advice, but for the price of a new one I'd wager you can go through 5 or 6 used ones. I've never had to change more than one in a vehicle.
Automatic tranny's are like helicopters, thousands of moving parts sort of loosely staying within the confines of the case. And yes, if the oil smells burnt, it's fubar, or soon to be so.
Some newer tranny's will last forever if you change the oil/filter every year or every 10000K or so. Don't and they'll fail.
Sorry for your problem but don't dispair too much, when the tranny failed on our chev 1500 w/ tow pkg I found out chev put's the same tranny in their, "trucks" as they do in their little pretend 4x4 square sh&tboxes designed to never leave a parking lot. Gee, wonder why they fail?