Well,I think it WOULD be worth it.Since I've already removed the deck,got the seat and the back fender off,and already have the speed control disconnected(it needed repair),and the wheels off-then all I have to do is 4 more bolts,and the unit just drops out.And,considering what the cost of another unit would be-like you said yourself,IF I could get one-just 4 more bolts,after I ALREADY have it mostly disassembled anyway,is certainly worth the time and trouble.Besides,it's just me in my workshop,working on my mower,for my own use,when I'm not using it during this time of year,like in summer.And maybe while I have it out,I can add in a drain plug,once I CAREFULLY determine WHERE to put it.(and clean out any chips from drilling!) I have the tools and knowhow and can tap threads to put in a plug,to save effort next time I need to change the oil.I still think the extra work,and minimal expense of oil,and filter is worth saving a good trans,that is not only scarce,but expensive,IF and WHERE you can find one.I have found a few,for about $500.Oil is $32 a can,a filter a few more.A LOT less expensive than at least $500.This mower,built 30 years ago,is MUCH better made than the ones nowadays-you would have to pay a LOT for a new mower built this way.It's much cheaper to keep what I've got.