I have a pair of 3A's and I need to replace prop shafts and seals. I have noticed that the prop availability and value are better for 3 than 3A. Since I have no intention of running more than 650hp Can I replace the 3A shafts with 3 shafts without any expensive mods or extra parts expense? I'm never going to able to afford new props. especially when I'm going to have to go through the trial and error of finding the right set. If not I'm in need of an affordable left hand 3A prop shaft.

19 spline props for 3’s for moderate hp are not easy to find. Something to keep in mind if you ever damage one.

Thanks see I'm learning. I know bravo but not SSM...

Has anybody ever heard of putting a sleeve on a prop shaft to repair the seal grooves? Or some other form of repair?

Yes , you can put a speedi sleeve on it or you can have it ground down a little and spray welded ,or ground down and ceramic coated.

joe, here is who I have used to coat some shafts in the past.

https://frielmetalresurfacing.com/

I personally haven't run into anyone yet that has had the seal groove area repaired on a prop shaft......but coming from a company that does some machining here, i have seen shafts repaired before....there are a few different ways of doing it depending on how you want to go about it.
Yes there are sleeves you can install over the existing shaft. Off the top of my head i know SKF makes some called Speedi-Sleeves that you can basically hammer in place over the damage and get going the quickest....assuming the damage is small enough to be covered by the sleeve.
You can also have the shaft metalized and reground to size.....they basically spray weld material onto the shaft the regrind it back to the original size. Downtime is probably the longest on this route but its basically the same shaft as new when you get it back.
Another option is to grind the damaged area down at a machine shop and use a smaller seal (opening wise) to seal the shaft again. This is assuming the seal area is the same or larger then anything in front of it so the seal can go back on without damage.

TomFTM beat me to it! LOL guess i had my window open for over an hour replying in between calls here!

Thanks boys Great advice! Ive found a few shops around here that do shaft repairs I just got to get them out and they said they will advise me on the best method once they see them...

Thanks again fellas...