leaky 904 and woreout old man

I have never considered an type of stop leak product for an auto, ( front seal leaky) but not on my financial plate to have it pulled nor this 70 yr old to pull it either on the dirt.
Is there a good product that can remedy this leak and not do any damage to the trans??
95000 mi 904 behind slant. Trans shifts fine, no rebuild desired anytime,