I replaced the slave on mine when my synchros were going bad. Had close to 100k on it. It made no noticeable difference. Might not be the same for you. The slave cylinder rebuild kit is really cheap. Another available option is to source an overseas/South American manual 5 speed. It will bolt up, but you will likely have to have its crossmember, as well as possibly alter the length of the drive shaft. I have no idea what all is actually entailed. Then it comes down to how much the cost differences are between that, replace in with a used AY6, or doing the T-56 swap.