Originally Posted by lapeer20m
Congrats on the bus !
I see you've encountered the same problem almost all of us have: SPEED.
the speed of your bus is equal to that of almost all diesel skoolies. My best advice: Get used to driving 55.
It's probably gonna cost in excess of $1,000 to change the ring gear thus increasing top end speed. The problem you might have after changing the gearing is not enough engine. I assume you have a 7.3 V8 non turbo diesel? This is the same engine used in ambulances and Ford F-series trucks during the early 90's. We have this engine in our "ambulance" on the fire department. it has a Ford truck front end with a big ambulance box on the back. This truck will barely do 65 downhill. IF it were a skoolie, it would weigh nearly twice as much making anything over 55 or 60 impossible. I believe our ambulance has a 4.10:1 rear end and an automatic trans with OD.
If the engine in your bus is a turbo, it may have enough power to do what you want. The newer ambulances will run circles around the non-turbo models.
With 22,800 hours on a 7.3 non-turbo, my friend's Ford E-350-scahhis cutaway shuttle bus/hauler will run 65 all day.
My B-700 will run 75, but it may have been re-geared (and has been repowered).