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Old 04-08-2013, 10:48 AM
tommyadrian5 tommyadrian5 is offline
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Join Date: Aug 2011
Boat: 1999 Sportstar 5.7L Vortec
Location: Mid-atlantic
Posts: 61
1999 Sportstar OB shaft diameter.

Having my exhaust manifolds replaced soon and going to have my mechanic throw a dripless shaft seal on it while he has it.

Does anybody know what diameter shaft my boat has? Unfortunately it is at a summer home ad I forgot to measure it this weekend when I was up there. I kind of remember someone in the past telling me that the sportstars came with 1" shafts but would like confirmation before I order it.

Thanks in advance.
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Old 04-08-2013, 11:08 AM
east tx skier's Avatar
east tx skier east tx skier is offline
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Join Date: Jul 2004
Boat: 1998 Ski Nautique
Location: End of my rope.
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It depends on whether you have a 1:1 transmission or a powerslot 1.52:1. In all likelihood, you have a 1:1, in which case you have a 1" shaft. If you have a powerslot, your shaft diameter is 1.125".

Sportstars were meant to be bare bones ski boats and most were not ordered with high priced options. But there were some that had LT1s in them, so I cannot rule out that there may have been some that had powerslots as well.
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