Originally Posted by Tango
On most units there is a plaque...somewhere. And it usually states the axle ratio but then, it could have been changed out.
Another way to find out what you actually have is to put it in neutral...jack up the driver side rear tires...align a mark on the tire and ground...and, put a mark on the driveshaft. Rotate the tire one full rev...and count how many turns the shaft makes. That will be your ratio or at least get you close enough to look up what is/was avail on your rig and get a match. I had to do that on mine and discovered the rear end was NOT what was indicated.
Originally Posted by BlueBirdman
There are usually two metal information plates attached above the driver's seat/windshield area. One of them will have the rear axle ratio.
There also may be a tag on the axle itself.
Found a plaque on the actual diff.: it says it's a spicer "something"455s, and it has full model and S/N. If gearing inside wasn't modified, i should be able to find some info starting from there....
Also, currently my bus has 11r22.5 tires, and comparing them to some pics that popped up yesterday on other threads, they look in very decent shape!
With that said, i guess i have to drive full steam to check max RPMs again, 'cuz i forgot!