Re: 54 7.5 HP Evinrude Fleetwin impeller
Not having the book in front of me, and depending on memory............
Some of those older models had their shift rod located outside of the long exhaust housing between the exhaust housing and the steering swivel bracket with a connector of sorts about halfway up the housing. Easy to see.
If you see nothing moving in that area when shifting, then yes.... remove the powerhead.