Adding extension boxes to SSMIII...INFO PLEASE.
#1
Registered
Thread Starter
Join Date: Jun 2003
Location: Somewhere other than Here
My Boat: 1972 36 Cigarette
Posts: 1,270

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?
Any other information about the conversion would be greatly appreciated. Any idea on total cost of the parts for the conversion?
#2
Platinum Member

Join Date: Jan 2002
Location: ALTO, MI
My Boat: 2001 Daytona 26, 1992 SCARAB 34, 1989 25 Checkmate Convincer, 1977 Glastron Carlson CVX 18
Posts: 4,452

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
#3
Registered
Thread Starter
Join Date: Jun 2003
Location: Somewhere other than Here
My Boat: 1972 36 Cigarette
Posts: 1,270

They do have internal drive shafts and u joint's.
#4
Registered
Join Date: Jan 2007
Location: Murrayville Georgia
My Boat: 1970 Wesco V-drive & 1974 CEE BEE Avenger jet boat
Posts: 1,127

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.
#5
Registered
Thread Starter
Join Date: Jun 2003
Location: Somewhere other than Here
My Boat: 1972 36 Cigarette
Posts: 1,270

So better to find a set of SSM5's
#7
Registered
Thread Starter
Join Date: Jun 2003
Location: Somewhere other than Here
My Boat: 1972 36 Cigarette
Posts: 1,270

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.
#8
Registered
Thread Starter
Join Date: Jun 2003
Location: Somewhere other than Here
My Boat: 1972 36 Cigarette
Posts: 1,270

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
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
#9
Platinum Member

Join Date: Jan 2002
Location: ALTO, MI
My Boat: 2001 Daytona 26, 1992 SCARAB 34, 1989 25 Checkmate Convincer, 1977 Glastron Carlson CVX 18
Posts: 4,452

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.
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.
#10
VIP Member

Join Date: Jan 2002
Location: Michigan
My Boat: 1986 Cougar US-1 46'
Posts: 2,806

__________________
"If some is good, more is better.
And to much is just enough."
----Carroll Shelby
"If some is good, more is better.
And to much is just enough."
----Carroll Shelby