Is there or was there a standard shaft that was used in the 1967 Commander Express 31 with 327's?

I'm having the boat shipped to me but I'm trying to get a jump on a new set of 4 blade OJ props for it so I can put them on before we launch her. Any help is greatly appreciated!

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Should be 1.25" I've heard 4 blade props don't do well on our boats though, vibrations if I remember right.

Thanks Mike, It has a new set of 15x17 Michigan wheel 3 blades on it but it's slow to plane and from what I understand it should have a pair of 15x15's on it.  I had a 1958 Chris Craft Sportsman and currently have a 77 Chris Craft Tournament Fisherman and I put OJ 4 Blade props on both of them and the difference was literally night and day. I'm going to talk to the guys at Johnson Props today and see what they say or if they have had any experiences with 4 blades on a 31. Either way, I think I need a lower pitch prop than the 15x17's.

My '66 31 has the original 15x17's With 327's and it gets right up on plane no problem. If fact I had it just over 30mph this past weekend right before my right trans blew. I think the newer 31's had 15x15's but they also had a higher redline on the Q's. At 30mph I was running 3,800 rpm, by the book I shoukd be able to get to 32 at 4,000rpm which I'm sure it would do with factory fresh engines, my 50 year old engines I'm sure don't put out 100% anymore. I would consider a possible engine issue, and or dirty bottom if it's having problems with that pitch prop.

Good to know.  These motors are original as well so a little less pitch may make them happy. 

"right before my right trans blew."....  Ouch!

My 1979 33 Catalina with 350K's has 1.25 shafts.

Yeah, just had it rebuilt too, not even an hour on it.

Dale Baker said:

"right before my right trans blew."....  Ouch!

My 1979 33 Catalina with 350K's has 1.25 shafts.

 30 mph at 3800 rpm and the gear was just put in? 1 hr old Im hoping the mechanic was still onboard.That just hurts to hear. Just curious did you change the cooler and lines as well as rebuild the gear?

New lines, the cooler was cleaned and pressure tested. The trans failed in the same place as it did the first time, the forward pressure seals, except this time instead of the seals wearing away slowly, the metal seals ate into the housing and through the back of the cap. One the back ring ate through the cap it was ejected into the housing, that's when I suddenly lost forward gear. I was only running 3,000 rpm when that happened. I only pushed it up to full throttle for a couple minutes, I try to do that at least once a week or so if the water is smooth enough.

Kevin McKinnon said:

 30 mph at 3800 rpm and the gear was just put in? 1 hr old Im hoping the mechanic was still onboard.That just hurts to hear. Just curious did you change the cooler and lines as well as rebuild the gear?

I have a pair of brass/bronze shafts from my 1967 31 Commander that had 327's.

If you need to know the length of the shafts I can  measure them.

John

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