In need of knowledge 89 48hp lower

[Bigle]

I have a 89 Johnson 48hp motor with a bad lower unit I have acquired a 93 48hp evinrude lower and to me the only thing that appears different is the shaft mine is tapered at the top spline where the 93 is not can I just put my shaft into the evinrude lower and trim it or are there other compatibility issues I will be facing with this thanks in advance.

 

[Bosunsmate]

Are the splines the same? Count them
I dont know any more about that, but someone else im sure will.
How far off is the difference in length, and shift shaft too

 

[racerone]

The small spline at the top of the driveshaft was used in 89 / 90 / 91 and 92 model years.-------These gearcases are NOT ROBUST in my opinion.-----Yes you can swap out the shaft.------Might be best to get a shop to shim the 93 pinion to the 89 driveshaft.

 

[racerone]

NOTE-----To swap the shaft would require nearly a total teardown.----Good time to install a seal kit too.