Think of it this way - if your reverse clutches are worn out the media from them is in the valve body, it would need to be cleaned out YES: soo take out the valve body see if your trans has this one in a hundred problem ( MY OPINION ONLY ) that the link talks about

You have nothing to loose but time - if its your only driver than you may just want to go the gusto and over haul it but dont forget the valve body -- jz