Gear ratio information needed

[rcahill31]

4-winns 245 vista 5.7L outdrive model985273 1.41gear ratio, found cobra model983843 if it is a 5.0L the ratio is 1.50 can this model be used in place of the 985273 which is junk?

 

[Master mechanic]

You posted " if ". Say it is then your ok but....you " may " have to change props.

 

[RicardoMarine]

By design, the engine determines the over-all gear reduction.
Between the 1.41:1 and the 1.50:1, there is little difference.... but none-the-less, there is a difference.
Typically, there is no substitute for a correct ratio. If can become difficult to prop ourselves out of an incorrect ratio.


However, if going to a numerically higher ratio (lower in terms of reduction) we typically do this when reducing horse power/torque.
IOW, the 5.7L engine would typically require the taller ratio (1.41:1)..... and the 5.0L engine would require the lower ratio (1.50:1).

The hull size can also influence this.

If you have already purchased this drive, about all you can do is give it a try.
Experiment with props, making your target the OEM spec'd WOT RPM.

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