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-   -   Adding extension boxes to SSMIII...INFO PLEASE. (https://www.offshoreonly.com/forums/drives-lower-units/357937-adding-extension-boxes-ssmiii-info-please.html)

Ironmanwb 12-02-2018 02:05 PM

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?





Tinkerer 12-02-2018 02:34 PM

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

Ironmanwb 12-02-2018 06:13 PM

They do have internal drive shafts and u joint's.

compedgemarine 12-02-2018 06:46 PM

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.

Ironmanwb 12-02-2018 07:24 PM

So better to find a set of SSM5's

TomFTM 12-03-2018 08:57 AM


Originally Posted by Ironmanwb (Post 4662000)
So better to find a set of SSM5's

absolutely...

Ironmanwb 12-03-2018 12:55 PM

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.

Ironmanwb 12-03-2018 04:51 PM

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

Tinkerer 12-03-2018 06:27 PM

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.

cougarman 12-04-2018 08:49 AM


Originally Posted by Ironmanwb (Post 4662080)
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


Jon


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