Great question!
Sunday Tucker:
The Ordettes [[later Patti LaBelle & the Bluebelles)
Cindy Scott & The Cousins
The Three Degrees
Third Generation [[later Wonderlove)
Former Ladies of The Supremes
was also in Ernie Terrell & The Heavyweights [[mixed group) and did back ups for Gladys Horton's Marvelettes in the 80s