as far as i know, devs did drop the idea of gearbox designer as a whole, giving us standardized gearboxes instead
how about giving a set of standard gearboxes and an advanced option to design them from scratch
I know it says hondas but it may be a good base, you can enter each individual gear and final drive and it will spit out top speed in each gear at redline and adjust for tire size.
We’re still going a range of standardized gearboxes with some choice regarding ratios.