changing lower unit gear ratio

[86strados169v]

Does anybody know what effect I will have If I change from a 2/1 to a 1.87/1 ratio? How will it effect prop size? will I need to go up or down? Thanks

 

[Don S]

Re: changing lower unit gear ratio

What is your problem? Whatever it is, I doubt you suddenly need a gear change to cure the problem unless you have changed altitudes.
Also, what Year, Make, and model engine do you have?

 

[WillyBWright]

Re: changing lower unit gear ratio

You would need less pitch to accomplish the same general performance. A different set of gears would set you back $600 - $800 depending on the model (ballpark).

 

[86strados169v]

Re: changing lower unit gear ratio

What is your problem? Whatever it is, I doubt you suddenly need a gear change to cure the problem unless you have changed altitudes.
Also, what Year, Make, and model engine do you have?

My problem is that I hit a rock with the prop and bent the shaft on my lower unit ! I have been looking around for a used lower unit and I have only been able to find one with a 1.87/1 ratio and I have 2/1 ratio right now! If change to a1.87/1 ratio I don't know what prop to go to. I have a 24p 4 blade right now but it was bent as well so It will have to be replaced ! I'm in the process of trying to take my lower unit apart to see how the gears look. If they look good I will just get a new shaft, bearings and seals for the lower unit I have and put it back together!

 

[Laddies]

Re: changing lower unit gear ratio

If the shaft is all thats bent remove it and have it straghtened. works for us in most cases

 

[86strados169v]

Re: changing lower unit gear ratio

hey laddies, do you know where to get parts, Seals, gaskets, water pump ect. for my lower unit! looks like everything is going to work out to where I'm only going to need a few part instead of a whole unit! Thanks

 

[Laddies]

Re: changing lower unit gear ratio

Here on lboats or anyplace that sells Sierra parts NAPA or most parts stores might as well get a seal kit and put a impellor in it while it's apart