Changing ratios in rear engine buses is more limited due to the reverse ring gear.
In a front engine bus, you can use a gear set from any medium duty truck with the same rear axle.
However, in a rear engine bus, it uses a special revers ring gear, and flipped rear axle housing not used on anything but rear engine buses.
So if there are 1000 gear sets available for the front engine bus, there will only be a few available for the rear engine bus, as the parts can only come from another rear engine bus.
I have never seen a rear engine bus around here with higher than 4.78. Most are 5.38.
This can change with geographic region due to the way the buses were ordered.
Also the Thomas rear engine buses are made superior in my opinion.
Much stronger rear frames, engine bay is laid out better, larger air cleaner, bigger retarder, and 6th gear unlocked on the ones with the MD3060.
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization