The Drifters like their name were an ever changing group:
May - June 1953 Clyde McPhatter and The Drifters Clyde McPhatter, David Baughan, William Anderson, David Baldwin, James Johnson
August 1953 Clyde McPhatter and The Drifters Clyde McPhatter, Bill Pinkney, Gerhart Thrasher, Andrew Thrasher, Willie Ferbee
1953 - 1954 Clyde McPhatter and The Drifters: Clyde McPhatter, Bill Pinkney, Gerhart Thrasher, Andrew Thrasher, Jimmy Oliver (gtr)
Mid 1954 The Drifters: David Baughan, Bill Pinkney, Gerhart Thrasher, Andrew Thrasher, Jimmy Oliver
Late 1954 - March 1955 David Baughan, Bill Pinkney, Gerhart Thrasher, Andrew Thrasher, Johnny Moore, Jimmy Oliver
Mid 1955 - August 1955 David Baughan, Bill Pinkney, Gerhart Thrasher, Andrew Thrasher, Jimmy Oliver
August 1955 - August 1956 Johnny Moore, Bill Pinkney, Gerhart Thrasher, Andrew Thrasher, Jimmy Oliver
August 1956 - Late 1957 Johnny Moore, Gerhart Thrasher, Tommy Evans, Charlie Hughes, Jimmy Oliver
Late 1957 - May 1958 Bobby Hendricks, Gerhart Thrasher, Jimmy Millinder, Tommy Evans
June 1958 - Mid 1959 Ben E. King, Charlie Thomas, Dock Green, Elsbeary Hobbs, James Clark
Mid 1959 - May 1960 Ben E. King, Charlie Thomas, Dock Green, Elsbeary Hobbs, Johnny Lee Williams, Reggie Kimber (gtr)
Mid 1960 Charlie Thomas, Dock Green, Elsbeary Hobbs, James Poindexter, Reggie Kimber
Mid 1960 Rudy Lewis, Charlie Thomas, Dock Green, William Van Dyke, Reggie Kimber
Mid 1960 - Late 1960 Rudy Lewis, Charlie Thomas, Dock Green, George Grant, Reggie Kimber
Late 1960 - Mid 1962 Rudy Lewis, Charlie Thomas, Dock Green, Tommy Evans, Billy Davis (gtr)
Mid 1962 - Late 1962 Rudy Lewis, Charlie Thomas, Tommy Evans, Gene Pearson, Billy Davis
Early 1963 Rudy Lewis, Charlie Thomas, Gene Pearson, Johnny Terry, Billy Davis
April 1963 - May 1964 Johnny Moore, Rudy Lewis, Charlie Thomas, Gene Pearson, Johnny Terry, Billy Davis
May 1964 - Mid 1966 Johnny Moore, Gene Pearson, Johnny Terry, Charlie Thomas, Billy Davis
July 1966 Johnny Moore, Gene Pearson, Charlie Thomas, Dan Danbridge, Billy Davis
August - September 1966 Johnny Moore, Gene Pearson, Charlie Thomas, William Brent, Billy Davis
October 1966 - Early 1967 Johnny Moore, Charlie Thomas, Rick Sheppard, William Brent, Billy Davis
Early 1967 - Mid 1967 Johnny Moore, Charlie Thomas, Rick Sheppard, Bill Fredericks, Billy Davis
Mid 1967 - Late 1967 Johnny Moore, Rick Sheppard, Bill Fredericks, Charles Baskerville, Billy Davis
November 1967 Johnny Moore, Rick Sheppard, Bill Fredericks, Billy Davis
December 1967 - Late 1969 Johnny Moore, Rick Sheppard, Bill Fredericks, Milton Turner
Late 1969 - Late 1971 Johnny Moore, Rick Sheppard, Bill Fredericks, Don Thomas
Early 1972 - Mid 1974 Johnny Moore, Bill Fredericks, Butch Leake, Grant Kitchings, Butch Mann (gtr)
Mid 1974 - Early 1975 Johnny Moore, Clyde Brown, Butch Leake, Grant Kitchings, Butch Mann
Mid 1975 - Early 1976 Johnny Moore, Clyde Brown, Butch Leake, Billy Lewis, Butch Mann
Early 1976 - Mid 1978 Johnny Moore, Clyde Brown, Joe Blunt, Billy Lewis
Mid 1978 - 1979 Clyde Brown, Ray Lewis, Joe Blunt, Billy Lewis, Butch Mann
1980 - 1981 Johnny Moore, Clyde Brown, Ray Lewis, Louis Price
Late 1981 - 1983 Ben E. King, Bill Fredericks, Ray Lewis, Louis Price
1983 - 1985 Ben E. King, Johnny Moore, Joe Blunt, Clyde Brown
Early 1986 - Late 1986 Ray Lewis, Billy Lewis, Louis Price, Jonah Ellis
Early 1987 Johnny Moore, Ray Lewis, Billy Lewis, Gene Jenkins
March - May 1987 Johnny Moore, Ray Lewis, Billy Lewis, George Chandler
May 1987 - July 1988 Johnny Moore, Ray Lewis, Billy Lewis, John Thurston
August 1988 - October 1989 Johnny Moore, Billy Lewis, John Thurston, Joe Cofie
October - November 1989 Johnny Moore, Joe Cofie, John Thurston, George Chandler
November 1989 Johnny Moore, Joe Cofie, John Thurston, Tony Jackson
November - December 1989 Johnny Moore, Joe Cofie, John Thurston, Keith John
Early 1990 - Mid 1990 Johnny Moore, Joe Cofie, John Thurston, Peter Lamarr
Late 1990 Johnny Moore, Roy Hemmings, Joe Cofie, Patrick Alan
Early - Mid 1991 Johnny Moore, Roy Hemmings, Joe Cofie, Peter Lamarr
Mid 1991 - Early 1995 Johnny Moore, Roy Hemmings, Joe Cofie, Rohan Delano Turney
Early 1995 - Late 1996 Johnny Moore, Roy Hemmings, Rohan Delano Turney, Jason Leigh
Late 1996 - Dec 1998 Johnny Moore, Roy Hemmings, Rohan Delano Turney, Peter Lamarr
Mid 1998 - Late 2001 Roy Hemmings, Rohan Delano Turney, Patrick Alan, Peter Lamarr
Early 2002 - Late 2003
Roy Hemmings, Rohan Delano Turney, Patrick Alan, Victor Bynoe
2004 to present
Peter Lamarr, Rohan Delano Turney, Patrick Alan, Victor Bynoe

Official Sources:
‘Rockin’ & Driftin’ – The Drifters Box (Warner Bros / Rhino Records RZ 72417) - 1996
‘The Drifters – Save The Last Dance For Me’ by Tony Allan with Faye Treadwell (MAGIM 903) - 1997
‘The Definitive Drifters’ (Warner Bros WSMCD137) – 2003