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Old 03-09-2015, 06:39 PM   #1
New Member
Join Date: Aug 2008
Posts: 7
Year: 1988
Coachwork: Blue Bird
Chassis: All American RE
Engine: CAT 3208 10.4 liter 250 h
Rated Cap: 78
What fluid in the differential of a 1989 78-passenger BlueBird All-American

So, I sheared off an axle, and found a replacement, but it is sitting on a bit of an incline, with that axle downhill, so I've lost probably 3/4 of the fluid out of the diff. What fluid do I add, and should I drain it completely and put in all fresh?
I've looked around, and found a tag on the diff that's hard to read, but I can make out "Rockwell International", and the model looks like it might read R 125NX 7

BlunderBus is offline   Reply With Quote
Old 03-10-2015, 12:46 AM   #2
Bus Nut
Join Date: Oct 2011
Location: Snowflake, Arizona
Posts: 343
Year: 1996
Coachwork: Blue Bird
Chassis: All American Rear Engine
Engine: C-8.3-300 Cummins MD3060
Rated Cap: 40 Prisoners
check out this link, You probably need a GL-5 lube and the type of differential will determine the viscosity.
Dragonpop is offline   Reply With Quote
Old 03-10-2015, 09:22 AM   #3
Bus Geek
Join Date: May 2014
Location: West Ohio
Posts: 3,703
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
Gl-5 rated 75w140, we use Valvoline but whatever brand you feel loyal to will work. If it has limited slip or is a two speed you might have to include a friction additive in the fluid for it to work properly.
Booyah45828 is offline   Reply With Quote

axle, bluebird, differential, fluid, oil

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