I’m original owner of this 44 year old still-functioning-well rear mower deck. Curious as to whether it’s wise to replace shaft seals on the gear box. It is not leaking but considering the age wondering if anyone has tackled that job. I would hate to have the seals start leaking in middle of mowing season. I was able to locate replacement seals and bearings for this gear box and I’m a preventative-maintenance kind of guy. But never having done this kind of repair before, would appreciate input from you guys.