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Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 15883
Experience:  Degree in Marine Technology. Gas and diesel marine mechanic.
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How much of a difference is there in a 4.3 and a,5.0 upper

Customer Question

How much of a difference is there in a 4.3 and a,5.0 upper drive assembly. I have a 5.0 in my boat and found a upper gear case ftom a 4.3 and need to know if I can swap them.yhx
Submitted: 1 year ago.
Category: Boat
Expert:  Jason replied 1 year ago.

Hello my name is ***** ***** I will be helping you today.

A 5.0 upper has an effective ratio of 1.23 to 1. The 4.3 has a ratio of 1.10 to 1. In a very heavy boat you would want to stay with the correct ratio. On a lighter or average boat, in reality it won't make that much of a difference.

You would more than likely have to make a propeller change, or increase the pitch on yours by 2 to 3 inches.

Expert:  Jason replied 1 year ago.

I think that should do it. But I work for tips so I do want to make sure you are happy with my service before you go. If you had a further question on the issue by all means feel free to ask. If not, Just in case you do not understand the way the website works (and some folks do not). You do have to put forth a positive rating in order for it to credit me for helping you. When ratings are not done, the website simply keeps your deposit and they will not credit me. The ratings box is located at the top of the screen. To rate, you must select the star you wish and also confirm it. Please let me know if you run into any problems or errors when trying to do it. If you do have a problem, or if you can not see the ratings box which is at the top of the screen. Please reply back "I rate Jason's service _______" and fill in the blank.

Questions do not close out, so if you have to come back later on with follow up questions to the issue you still can even after doing a rating.

Thank you and happy holidays!

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