Could be your drivetrain catching back up to your motor/vise versa. My buddies 4runner does it all the time as he kinda isn't the greatest at shifting it and it's a little timid and likes to be carressed lol.
But mine makes. Clunk sometimes shifting into 5th at a lower speed and rpm. Totally normal if that's the noise your hearing.
2005 Redfire GT - Mac LT's/prochamber, Pypes mid muffler, FRPP hotrods, 4.10's, Steeda tri-ax, JLT CAI, Bama tuned, Nitto nt05's 333/327 dynojet A little go go juice too