I know I have a 17:21 upper gear ratio off a factory 305 from 1983. My sticker is gone from the top and I found one that says 1.50:1 on the sticker. Are these the same?
Re: Is 1.50:1 the same as 17:21 upper gear ratio for OMC
The correct gear ratio for the top is 21:17 for the 305. I can't remember what the correct gear ratio for all V8 800 drive lower units is 14:26. This gives you a total of .67 which gives you an overall ratio of 1.50:1.
The correct gear ratio for the top is 21:17 for the 305. I can't remember what the correct gear ratio for all V8 800 drive lower units is 14:26. This gives you a total of .67 which gives you an overall ratio of 1.50:1.
Just what I needed to know. I bought a used drive off a guy who said it came of a V-6. The sticker on the top said 1.50:1 and it had the same prop on it as mine. It also had close to the same model and serial number as mine. I now have it mounted and ready for a test.
Funny side note, we tried the steering and it was backwards. Thanks to some research on this site I found out about 2 diff. worm gears. I elected to switch my steering box 180* instead and we are ready to go.
