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Adding extension boxes to SSMIII...INFO PLEASE.

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Adding extension boxes to SSMIII...INFO PLEASE.

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Old 12-02-2018, 03:05 PM
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Default Adding extension boxes to SSMIII...INFO PLEASE.

Thinking about putting extension boxes on my 1972 36 cigarette widebody. My drives are currently to deep so I want to raise the x dimension about 3" . I am not going to raise the engines. So my question is how much travel do you have with the extension box once it is mounted to the boat. And how much higher do I need to go to get back to neutral since the boxes are 10" set back.

Any other information about the conversion would be greatly appreciated. Any idea on total cost of the parts for the conversion?




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Old 12-02-2018, 03:34 PM
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Unless you use Stelling's boxes with internal U joints and drive shafts You will have to raise the engines. ( this is true for BRAVO drives - I don't know if Stelling makes boxes for #3 drives
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Old 12-02-2018, 07:13 PM
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They do have internal drive shafts and u joint's.
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Old 12-02-2018, 07:46 PM
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general rule is up 1" for every 12" of setback so that would mean you are trying to go up 4". with a 10" setback you are going to try for a 4" offset in that 10" which means the u-joints are not going to last a week.
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Old 12-02-2018, 08:24 PM
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So better to find a set of SSM5's
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Old 12-03-2018, 09:57 AM
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Originally Posted by Ironmanwb View Post
So better to find a set of SSM5's
absolutely...
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Old 12-03-2018, 01:55 PM
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Well---sh!t ... I guess I will cut the transom and run it with what I have and then try to find some 5's when I have some spare change.
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Old 12-03-2018, 05:51 PM
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Last 2 questions....

how much could I raise the drive height with the boxes and not hurt the u joints?

can I get 2" spacers for SSM 5s
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Old 12-03-2018, 07:27 PM
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IF you don't cut the holes any bigger or taller than you have to you could always lower the boxes later.
Some people slot the mounting holes on the box ( transom side ) so that if you loosened the bolts the box could be raised or lowered with out removal.
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Old 12-04-2018, 09:49 AM
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Originally Posted by Ironmanwb View Post
Well---sh!t ... I guess I will cut the transom and run it with what I have and then try to find some 5's when I have some spare change.
Here ya go...https://www.offshoreonly.com/forums/...s-tie-rod.html


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