49ers
Montana, Roger Craig, Jerry Rice, Ronnie Lott... Since they were all there together they deserve to be the 4 on the Mountain together.
Alternates and additions:
Steve Young, Y.A. Tittle, Dwight Clark, Wilcox, Bill Walsh... Possibly even Frank Gore as he's had a hell of a career over the years
Yankees..
Too many to list.
Ruth, Mantle, Gehrig, DiMaggio would probably get the nod for the 4.
Mariano, Jeter, Posada, and Bernie for another generational mountain
Whitey Ford, Munson,Yogi, Maris, Reggie, Dickey, Stengel, Rizzuto, yada yada yada yada yada...