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-   -   Difference between #4 speedmaster & #5 (https://www.offshoreonly.com/forums/drives-lower-units/22975-difference-between-4-speedmaster-5-a.html)

Griff 01-03-2015 01:51 PM

An SSM IV is a shorty 3. An SSM V is shorty 3A.

cig92 01-03-2015 02:02 PM


Originally Posted by Griff (Post 4243646)
An SSM IV is a shorty 3. An SSM V is shorty 3A.

I don't think that is correct. Larger gear sets . You can't handle more hp just because the drive is shorter. The higher the # the more hp you candle, that's the simple way to explain it .

Unlimited jd 01-03-2015 03:00 PM

The vertical shafts could take more torque being shorter

RMPRam 01-04-2015 01:06 PM


Originally Posted by cig92 (Post 4243650)
I don't think that is correct. Larger gear sets . You can't handle more hp just because the drive is shorter. The higher the # the more hp you candle, that's the simple way to explain it .

The #3 and #3A are basically the "same number", but way different in internal construction. The #3A has the same straight cut, near net forged upper gear set as the #5 and the same propshaft (1.75" dia.) and lower gears as the #5. The #3 and the "shorter" surfacing #4, share, basically the same internal components. In my opinion, the "weakest" of the four drives is a #3 followed by the #4, then the #3A and #5 are the same strength, but the #5 is the "surfacing" version of that set.


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