Originally Posted by Jolly Roger
Thank's for the history and I do appreciate the comment! But that didn't address the question?
From what I understand the AT545 is a non overdrive transmission.
That is the first problem.
Second is the 6 something rear gears.
My bus does around 100 kph downhill (60 mph) with 4 something rear gears and a non overdrive transmission.
You can either exchange rear gears or replace the axel.
I feel like replacing the axel will be cheaper and easier than replacing the gears.
Most MD axels would fit I think. Possibly even HD axels.
Around here there are several MD and HD salvage places.