Pretty sure you’re going to throw a code with 15/43 .349. It took me about a week before mine showed up at 16/46 .348. Ck engine, no gear indicator. Thay was how I got my Vx, with code freshly reset from previous owner.
You won’t really pick up any top speed with taller gearing. 103 indicated on the flat is about all there is in any ratio. There is a difference in how quickly the 300 will get to the top tho. Better acceleration with lower ratio.
A brief history of my ratio experience with my 2017.
16/46 when purchased in ‘20
14/46 rest of ‘20 season
15/46 1st month of ‘21
14/46 rest of ‘21
14/48 for a couple weeks now
It did throw-up a code 25 after about 120 miles, which means the gear selector sensor isn't communicating with the ECM. I researched for a fix, but the only thing I found was shorting-out the clutch switch, but that doesn't seem like such a great idea. I also thought about taking it to a dealer to reset the ECM, but that costs money and I'm cheap. Plus, doing a reset would probably only work for another 120 miles or so until the problem returned, I'm thinking. What I did was simply ignore the situation and continued to ride it as it was, and after about another 120 miles, the system reset itself. The Check Engine light simply blinked-out, and the gear selector came back too! The only guess I have about that is that the ECM had to "learn" that the final drive ratio had changed, and adjusted itself accordingly, just like modern cars will go into a default mode until it has enough miles to re-learn your driving habits if you disconnect the battery. I haven't found out anything about that in the factory manual I have, all I know is everything's back to normal now. It makes me wonder how many people have panicked over the issue, and resorted to haphazard "fixes", or have started on an endless number of return trips to the dealer for a "reset"...
