I remember reading somewhere that there is a difference in meaning between "y'all" and "all y'all":
1) Do y'all have a ride?
2) Do all y'all have a ride?
In one of them (and I don't recall which definition is which) the meaning is "Do each of you own a car?" and the other one is "Do each of you have a car you can ride in?"
So if Bob, Jim, and Jane are all riding in Bob's car then "y'all have a ride". But if all three of them have their own car, then "all y'all have a ride".
1) Do y'all have a ride? 2) Do all y'all have a ride?
In one of them (and I don't recall which definition is which) the meaning is "Do each of you own a car?" and the other one is "Do each of you have a car you can ride in?"