Modify vanilla humvee, set center diff ratio to 100, then to 0, notice no difference.
For comparison, modify a differential which is part of an axle, now 100x switches through all gears before it even reaches 10kph.

the issue can easily be circumvented by multiplying center and axle diff ratios and inputting the result into the latter, *but* I spent like 4 hours to figure out why the RL performance figures for a car I'm working on wouldnt work and I suspect many other people will lose a lot of time on this issue or even give up on it.