While your at it, you should throw some diesel fuel in the gas tank. Just because honda says to use gas don't mean s***.
Your logic is flawed, and you are a rude *. The higher viscosity of the gear lube will make the gears more difficult to turn, an effect that is amplified as the speed at which the gears turn increases. This will
not make the gears last longer but
would instead shorten the life of the assembly. At high speeds, the thick gear oil (intended for differentials, planetaries, and other kinds of
much larger gears that are machined to
far less precise specifications than honda's gearbox (not the transmission, as you stated incorrectly (the transmission is a CVT type consisting of a belt and variator)) would push the gears apart from each other.
As the high viscosity gear oil is squished like playdough between the rapidly meshing gears, the volume of oil in excess of the space between the gears (as oil does not compress) must be displaced. If you have any concept of fluid dynamics, I do not need to point out that the pressure of the oil between the gears would increase if a thicker lubricant was used. I'm guessing you skipped or slept through any classes that dealt with the topic, surely dismissing them as "more s*** I'll never need to know." In turn you would not realize that the pressure built up between the gears is transmitted to the bearings, causing possible premature wear.
That's fine and all that you have not taken the time to learn the science behind it all. That's why we made a forum, so that people like you who don't know much can ask people who
do know what they are talking about (for instance, Baka and Bear).
*, I don't even care if you ignore good advice, I've done that before...
No, the problem here is that you came into this forum of people who know what they are talking about, asked a question that you thought you knew the answer to (actually, you asked the wrong question

the viscosity matters
much more than the brand), found out your previous train of thought was at the totally wrong station, then flamed the people that tried to help you.
You can avoid being ignorant by taking what you learn here and further researching the way things work. Buy some books. Read,
Absorb, and *poof* ignorant no more!
You can avoid being a * by learning a touch of humility and not always assuming that you are always right, regardless of how well you actually know the subject. And dissent can also be delivered without being a *.
But, at this moment, you are little more than an ignorant *. You can fill your gear case with redi-mix concrete for all I care.
If you want my opinion, I'd say Synthetic 10w40. Florida heat is nothing to the internal temperatures inside an engine are, far above what your gear case will ever see. 85w90 gear lube will work, but measurably not as well. Ipso facto. Take it or leave it.