Congrats on your DIY.
There shouldn't be any 'bang' stops, especially on only half of the gearbox. If there are look at two separate things:
- did you remove the shifter assembly's appendix (green plastic plate on bottom of housing)? If not, do so ASAP.
- adjust (shorten) the cable on the right (as facing forward in vehicle) one or two threads at a time until the banging ceases
Good luck