I recently bought a 30hp Yamaha with a bum lower. It has a pretty big crack with a questionable looking repair weld so I think I'm gonna shop around for a lower. Having trouble finding a 25/30 lower but there are a lot of 40's available. Have read elsewhere they bolt up but require the driveshaft to be cut down slightly (3/8-1/2") and splines extended down same length. I'm no machinist so I'm wondering if this is something most automotive type machine shops can handle or if its a job for a more specialized place? Curious on what the cost may be as well for a trim and spline extension or a ~5" removal and total respline to make it a short shaft?

And somewhat on subject, I have both a 30 long and short driveshaft and could just swap either out for the 40 one....if they will fit.

Anyone have any thoughts?