Re: 99 25 hp johnson
Welcome to iboats dlee!
First remove the water intake screens from the lower unit. Behind it you'll find the shift rod connector. With two wrenches, unscrew the upper part of the connector out of the lower part.
Raise the upper part up to expose a small plastic keeper on the end of the upper shift rod. Carefull take the keeper off....it's split for this but be careful, they break easy if pride to far apart.
Work the shift lever to raise the upper shift rod up so you can remove the upper part of the shift rod connector. Once off, the lower unit will drop off.
Check the link below to BRP's site. Click on product in the upper left hand corner and follow the directions. You can see the parts breakdown for your lower unit.
http://epc.brp.com/(X(1)S(vomq3p45q43v3uznhc4gupig))/login.aspx?ReturnUrl=%2fdefault.aspx%3fbrands%3dej%26lang%3dE&brands=ej&lang=E&AspxAutoDetectCookieSupport=1