Lower gear ratio Alpha1

[walleyehed]

Would anyone know what the lower gear ratio is for a '85ish 260 mercruiser with (I believe) an Alpha 1 Drive???<br />I need the ratio to figure prop slip.<br />Thanks.

 

[Bondo]

Re: Lower gear ratio Alpha1

All Merc. Alphas,+ Pre-Alphas are 1.65/1 in the lower unit,........<br /><br />Over-All Gear Ratios are determined by the Upper Gear Set............<br /><br />When Combined with the 1.65/1 of the Lower Gear Set,..<br /> <br />You end up with Over-All ratios of 1.98/1 for the 4 cylinders,.. <br />1.84/1 for the 470s,+ some of the 6 cylinders,..<br />1.65/1 for some of the 6 cylinders,+ high altitude V8s,... <br />1.50/1 for the Standard V8s,.. <br />And there's a 1.32/1 available for some Hi-Pro models......