Sorry, I don't remember the exact dimensions but I seem to recall a "20" and
a "25". I believe the actual dimensions referred to are from the underside
of the transom clamp (that would rest on top of the transom) down to the c/l
of the prop shaft. The easiest way to check against another otherwise
identical motor though, is to measure the mid section--from the bottom of
the powerhead to the top of the "foot".
LD

"Tom Creech" wrote in message
...
Now I'm not so sure that it's a short shaft.
Part # crosses to short shaft assembly, but seller says that the exposed
shaft (sticking out of lower unit) is 21".
That would be a long (20") shaft, right?
I'm thinking that someone rebuilt this for a long shaft..
Any thoughts?

Thanks again,

Tom
"Tom Creech" wrote in message
...
I need a new lower unit for my 1979 70 hp Mercury outboard (long shaft).
I've found one, but it's for a short shaft). Aside from the length of
the
drive shaft, is there any difference in the two?

Thanks,

Tom