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Old 08-06-2022, 02:11 PM   #1
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What differential fluid to use

Hey Guys,

I need to change the diff fluid on my 01 Fleetwood w/ Cummins 6.0 Diesel.

Can anyone identify this?

And/or recommend the diff fluid?

Thanks guys!!!
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Old 08-06-2022, 02:28 PM   #2
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Quote:
Originally Posted by jvannghi View Post
Hey Guys,



I need to change the diff fluid on my 01 Fleetwood w/ Cummins 6.0 Diesel.



Can anyone identify this?



And/or recommend the diff fluid?



Thanks guys!!!


I would imagine itís in a freightliner chassis. That universal looks a little dry also.
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Old 08-08-2022, 01:05 PM   #3
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Originally Posted by Tha_Rooster View Post
I would imagine itís in a freightliner chassis. That universal looks a little dry also.
Yes, freightliner.

any recommended fluid? 75-90 gear/diff oil?

Wouldn't doubt it's low.

Thanks!
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Old 08-09-2022, 06:02 AM   #4
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I use the Mobil Delvac 1 fully synthetic gear oil in mine.
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Old 08-09-2022, 06:07 AM   #5
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....have to agree with Rooster.

Make sure you grease the u joints and spline on the driveline.
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Old 08-16-2022, 02:04 PM   #6
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According to this 2004 dated Know Your Freightliner Chassis, page 10

Quote:
Rear Axle Differential & Front Wheel, Oil
SAE 80-90W Gear Lubricant
Can be either synthetic or not.

https://www.rvtechlibrary.com/chassi...ourChassis.pdf

Notes: This document has tons and tons of helpful information!

Differential oil doesn't small bad at all when new, BUT it stinks to high heavens when draining out! Might want to give some thought to using disposable gloves, eye wear and very old clothing. Also protect the surface below incase of drips or spills.

If changing the oil in cold weather, warm the new oil first. It will make it as lot easier to get it into the housing.

Did I mention the old oil stinks, smells and you might be banned from he house until you de-stink your self????
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Old 08-16-2022, 02:13 PM   #7
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Clean the area up ; top up the fluid , and drive the coach .

You don't want to do a complete change till you figure out where that leak is .

You maybe pulling the differential apart to replace a gasket, then you'll need to do a complete refill.

BTW: I believe your Cummins is a 5.9L not a 6 .

My 99 Freightliner XC chassis differential holds 16 quarts of fluid , you wouldn't want to do a fluid change now then have to do it again any time soon.
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Old 08-16-2022, 02:16 PM   #8
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Also check out this link. see sections 35-01 & 35-02

https://dtnacontent-dtna.prd.freight....html?SM_USER=
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Old 08-16-2022, 02:23 PM   #9
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OK ; on blowing up you photo ; I've noticed your chassis has leaf spring suspension , so your differential might not hold 16 quarts , but that leak still needs to be investigated .
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Old 08-16-2022, 03:22 PM   #10
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The coach is a 2001 Fleetwood Expedition with airbag suspension.
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Old 08-16-2022, 04:35 PM   #11
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I see the air brake cans and it's clearly a rear engine, but that sure looks like a stack of leaf springs at the far right side. Never heard of an Expedition without air suspension, though.
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Old 08-17-2022, 03:30 PM   #12
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Thanks for the replies , info and links!!

Yes, 5.9 Cummins, leaf springs, WITHOUT airbags.

Any clue the differential capacity?

Greatly appreciated!
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Old 08-17-2022, 06:40 PM   #13
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Thanks for the replies , info and links!!

Yes, 5.9 Cummins, leaf springs, WITHOUT airbags.

Any clue the differential capacity?

Greatly appreciated!
Sorry , I canít say what your differential capacity is .
When I called Freightliner for the amount they said 16 PINTS , and I was under the coach with a 12 quart drain pan , only to discover capacity is 16 quarts.

Clean up took a while.
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