Washer makes loud clunk as it goes around.

it sounds like you have a broken spinner assembly,
this is the unit that connects your innur tub to you center shaft seal,,,,
it can be replaced and repaired by you no special tools but the cost could be quite extensive....
an outer tub and spinner is an absolute minimum and there are parts to inspect as you take it apart
do you need both halves of the outer tub would be the biggest one
unless this machine is less than just a few years I would just not bother putting the money into it
its well past cost effective 500.00 for the two parts ive mentioned