How do I find the ratio of my drive?
There should be a serial number on the drive starting with “27xxxxxxx” and then often a letter like a “B”.
The tag is on the upper unit on a tag near where the U-Joint bellows connect. The tag will have
the serial number and the ratio as well. Choices are 2.15, 1.89 or 1.61 ratio.
If the drive works at all, you can turn the input shaft and count how many revolutions the prop shaft
makes. So a 2:15 means that for every 2.15 turns of the engine (or the 270 input shaft) the prop
shaft turns once. Smaller 4 cylinder engines like the AQ130 usually had 2.15 ratios, but larger engines
often had small ratios (I.e. the prop turns faster).