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Volvo Penta Outdrive SX-M

Does anyone know what year Volvo Penta introduced the SX-M Outdrive model? According to the outdrive chart from Volvo Penta they started out with the SX-S (presumably in 1994 shortly after acquiring OMC), then they came out with the SX-C, SX-C1, and SX-C2 models, and then theSX-M. The chart gives no indication for the year each model was introduced. The transom shield however seems to have remained the same for all SX models up tothe SX-M.

In 2007 Volvo Penta introduce the SX-A which included a redesign of the transom shield so it becomes a new/different ball game again. I have also looked at parts sites like Doug Russell and all I’m finding is a warning about the SX-A Model not being backwards compatible.

I’ve gone to the VP website and it doesn't give much in the way of detailed Historyfor outdrives. I've seen one post on a boating forum referencing the SX-M as far back as boat model year 1999. So it would seem that the SX-M model ran roughly from 1999-2007.

As a side note; As they have always done, Volvo Penta put the gearing to accommodate the engine size in the lower unit, and the upper transmission always has the same gearing. So because VP put the gear ratio ID tag on the side of the upper; almost every upper unit for sale also lists the gear ratio off the tag, which doesn’t mean a thing if the lower unit is not included.

Ata ny rate, if someone here has any more information about the SX-M model I would love to hear about it.
 
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OK, since no one here has a clue;), I finally called and spoke to someone over at Doug Russell.

He said the SX-M model ran from approximately 1998 to 2006. Prior to that was the SX-C, C-1 and C-2 models but most things between the C and the M was interchangeable.

He also said there are 2 different uppers dependent on the size engine.

There is a 22-23 upper for the 1:43, 1:51, 1:60, and the 1:66 ratios which are for V-8's

There is a 21-26 upper for the 1:79, 1:89, and the 1:97 ratios which are for the V-6 and 4 cylinder engines.

I asked what the numbers meant for the uppers and he said the number of teeth on the upper gears. So it appears Volvo must have kept or adopted similar geometry as the OMC drives.

Hopefully this information will help someone in the future.
 
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