My understanding was that changing the final drive is a lot more involved than swapping the 5th gear. For the 5th gear swap, it's actually possible to do the work with the transmission still in the car... end cover of the tranny comes off, pop the clips holding the gears in, slide off the old ones, slide on the new ones, and then put it all back together. I'm simplifying a bit, but you get the idea. For me, since the tranny had to come out for the clutch anyway, doing the gear swap was super-easy (done in less than 15min). The final drive change would require a full dis-assembly of the tranny, from what I gather.
Other than thinking that I should've gone with a taller gear, I'm pretty happy with the swap. There is obviously a bit more of a gap between 4th & 5th now but I've easily gotten used to it... don't really notice it anymore. And swapping it again (if I decide to go with a taller gear) is going to be even easier, now that I know how to do it!
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