[JaM]

AH-64 COIN - 30mm M230 if far more effective veapon than 7.62 minigun.
AH-64 is not able to shoot TOW missiles as they are wired SACLOS guided.Apache use laser beam to guide Missiles. They have HE Hellfire missile, Israelis use them against Hamas leaders and similar geeks... (TOW is not as big as Hellfire, so Hellfire is more effective with HE warhead)
M1A3 Abrams - Current guns are quite effective, so they dont need 140mm so soon. New projectiles such as M829A3 could penetrate over 900mm at 2000m,It is enough to kill even most modern T-80/90... Other things are in TUSK improvement