I learned the chain trick in a stranger's driveway just over the Michigan line from Toledo. A friend in highschool had a '57 Bel Air that we had stuffed a 454 into. On a test flight the 10 bolt rear decided to spit a spider gear out through a new hole in the rear end housing.
The owner saw the car at the end of his 100 yd long driveway and came out to chat. We asked if we could fix it there and he didn't have a problem with the plan. We had a friend take us home and got a spare diff and swapped it out in about 30 minutes, hammered the new hole shut and put some duct tape over the slot. We drove the car home and started shopping for a 12bolt posi to hang under the car.
The father of my friend had a great plan to keep track of his 4 boys and a few of us got sucked into the deal. The dad made a deal, he would spend the money if we put in the time to do the work. I don't know how many hours we spent in their garage on weekends and during the long summer nights but it kept us all out of trouble for about a year during a total resto-rod build. Driving around in a '57 in the early 80's was something I'll always look back on. I'm already trying to see what kind of car my 5 year old will want to build...