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Old 07-07-2021, 07:52 PM   #1
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Join Date: Jul 2021
Location: Wyoming
Posts: 4
Year: 2006
Coachwork: BlueBird
Chassis: Vision
Engine: Cat C7
Rated Cap: 35 adults
2006 Blue bird vision rear diff. issues

Hey all! I recently bought a 2006 Bluebird vision, It has a cat c7, Allison 2500, The issue I'm having is the rear diff. Is making a whining sound at 45 mph and 65mph and has a fair amount of slop when I have it in neteral and turn the driveline it will spin a good 1 1/2 " of free play. What is "Normal" for these rear ends? And yes the rear end is full of oil and clean! Any help on this issue is much welcome!!!

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Old 07-07-2021, 09:06 PM   #2
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Join Date: Jun 2020
Location: Long Beach, CA
Posts: 527
Year: 1998
Coachwork: Blue Bird
Chassis: TC1000, 40' MPV
Engine: 5.9 Cummins/B300 trans
Rated Cap: U/K
I'm no bus mechanic but that sounds like a worn out ring and pinion, like it ran dry at some point and was refilled. Lots of experts around here to help you out. Good luck with it
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Old 07-07-2021, 09:50 PM   #3
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Join Date: Jul 2021
Location: Wyoming
Posts: 4
Year: 2006
Coachwork: BlueBird
Chassis: Vision
Engine: Cat C7
Rated Cap: 35 adults
Ya, seems a bit much, I suspect the bus has alot more miles than it shows (100,250) I'm just trying to find out if just swapping out a good used unit is worth the $550. Or if this is an easy fix?
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Old 07-12-2021, 12:56 PM   #4
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Join Date: Feb 2020
Location: Way Out West
Posts: 38
Year: 1990
Coachwork: Century
Chassis: C5500, Bus not a School Bus
Engine: 3116 9YN, CAT, 250HP
Rated Cap: 30k
I just replaced the rear diff in my GMC chassis for the same thing, over 55mph and ~20 minute into a drive when everything got warm I would get a really weird noise through the drive train under load. If I lifted the throttle just a little it would go away.

I paid $900 for a reman assembly with no core. I also swapped ratios to get a little more pull power as I tow a trailer and wanted to boogie up hills.
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Old 07-12-2021, 02:21 PM   #5
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Join Date: May 2018
Location: topeka kansas
Posts: 1,054
Year: 1954
Coachwork: wayne
Chassis: old f500- new 2005 f-450
Engine: cummins 12 valve
Rated Cap: 20? five rows of 4?
My rear end

I did not have a problem. I wanted different gear ratio. Inspected, shipped, cost me $800. I was told this gear ratio 3.73 with a “tone ring” for ABS - anti lock brakes did not exist. I spent a week looking.

William
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Old 07-12-2021, 11:07 PM   #6
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Join Date: Jul 2021
Location: Wyoming
Posts: 4
Year: 2006
Coachwork: BlueBird
Chassis: Vision
Engine: Cat C7
Rated Cap: 35 adults
Yep, Exactly the same issue!!
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