Bad Transmission ?

Quick question . My 2002 330 with 137k miles just started to shutter when driving in M mode.It happens when i am coming to a stop and put it in 1st .It also does it when i put it in reverse,and from reverse to drive. I have done 2 fluid/filter changes in the last 110k mile I have owned it . Does this sound like trans is on its way out? Or should i try fluid/filter change ? I have 90% of the stuff i need for my 5 speed swap. As soon as i get a few more things, Im gonna do the swap right here in my driveway