</font><font color="blue" class="small">( Basically, what I gather from the "TBN Great Debate" threads is that if treated properly HSTs will last a long time. I also gather that if treated properly gears will last a long time )</font>
How long is long? The gear tranny in my 46 ford 2N is 58 years old.. and basicalle is just a casting, gears, bearings, and 1 front input seal.. and oil.. unfiltered oil at that.. shared by the diffy and hyd pump...
It is durable by design and due in part to its simplicity. An HST tranny is full of seals.. etc. In 50 years are any of those seals going to leak? How hard will the repair be? How costly? The seal on my gear tranny is 3 bucks, and I can split the tractor and replace it fromthe outside and slap it back together in less than 2 hours.. all in my barn, and using no more tools than some jacks, socket sept, and a happer and screwdriver. My guess is the directions for repairing an HST tranny might be a bit more difficult, and more expensive.
I think it will just be a matter of time-testing to see if HST trannies have the extreme longevity of a basic no-frills gear tranny.
No doubt the HST offers lots of nicer features and flexibility.. that may be at the expense of lifespan, and repair costs.. etc.
Not knocking the HST tranny.. just 'waiting' to see if they end up deing as durable as the gear tranny. After all.. there are many trannies from tractors from the 30's chugging right along with no problems...
Soundguy