Call Mercrusier USA (405-743-6566) and give them the Drive #. They match each drive to the engine and they keep great records. As for the prop, most dealers install the props. If it was a used boat when you bought it the prop may have been changed anyway. Replacing the prop if you dont know what was installed is a small nightmare. But have no fear, there are ways to make it a little easier.
Anyway, call merc give them the drive and engine number. You are going to need the following info from the them:
1: Drive gear ratio
2: Type of drive (Alpha, Bravo, ect....)
3: Manufacturers recommended wide open RPM rating**********Most important!!!!!!**************
Next, you should have recorded this info on your original breakout cruise. If not, maybe you remember.
1: Make of engine
2: HP of engine
3: Boat weight
4: Total crusing weight ( boat + fuel + water + gear + passengers + zodiac and OB + any other extras.) Normal crusing weight!
5: Wide open throttle RPM
6: Wide open throttle Speed
7: Normal cruising speed and RPM
Extras : Time to plane and RPM at plane, Time to 30 mph.
Getting a new prop is one of the last dark arts in boating, so take your time and dont rush this.
I just bought a new prop for a 97 Maxum 2800 SCR from Power Tech
This is the best company I have ever done business with. They are all about you getting the prop you need and not the prop they want to sell. Anyway here is the contact info for them.
for Marcus x241 <----This guy is great to deal with!!!!
for Bill x227
for Jeff x226
Once they run your specs through the computer and give you the price directly them from them. Hang up and call Dan's Discount Propellers at 1-800-573-5533 and he will beat the price better anyone you will find. I bought a prop for a Bravo 2 drive for $624 from him instead of $800 to $1000 other place. Shipped to me in 3 days. The prop I bought was a 17 3/4 x 19p Stainless Steel 4 blade.
The guys at prop tech will walk you through everything you need to replace the prop with no pressure to buy. Let me say it again, they are wonderful!
If you need any further help let me know. I am more then happy to help you find contacts for what you need.