Re: 70EL77S Long shaft or short shaft??
I dont think you can tell from the model number. At least they seem to list both standard (15") models and longshaft (20") models against the same number'
Measure it!
Measure from the transom top (or inside the mounting bracket) down to to about an inch or so above the cavitation plate. If you are in the region of 15" then its a standard shaft but if you are round 20" its a long shaft.
Also look at these two diagrams and note the differences in design of the leg (exhaust housing) itself (#46 in the first ,#32 in the second))
Standard shaft model
Longshaft model
The gearcases are also different but not quite so obvious