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Open Roads Forum  >  Class C Motorhomes  >  Class C

 > Differential Service

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Trackrig

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Posted: 12/21/21 11:33am Link  |  Quote  |  Print  |  Notify Moderator

I've always changed the differential oil in my rigs around 50,000 miles if I bought them new. If it's a used vehicle, it gets changed as just part of going through everything. I like to know if anything is falling apart in there before it's serious.

Bill


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EMD360

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Posted: 12/21/21 12:19pm Link  |  Quote  |  Print  |  Notify Moderator

Differential fluid is not part of a typical oil change fluid check. It did not occur to me to check it. Of course I had the tires checked and the brakes. That’s why it’s in the shop. Also getting Koni shocks and a Heliwig sway bar in front.


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Krusty

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Posted: 12/21/21 12:52pm Link  |  Quote  |  Print  |  Notify Moderator

All fluid levels should be checked during an oil change. Differential included.


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klutchdust

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Posted: 12/21/21 01:37pm Link  |  Quote  |  Print  |  Notify Moderator

PartyOf Five wrote:

He said when the particulate matter in existing fluid will, when replaced, make the seals/ gaskets the "weakest link" & they may fail more readily. Let a sleeping dog lay.



That's a new one. I do know this. A transmission "flush" is the worst thing you can do to your transmission.
Jerry was in business over 30 years, replaced many a trans just after a flush. Want piece of mind, don't flush.....your tranny that is....

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Posted: 12/21/21 01:56pm Link  |  Quote  |  Print  |  Notify Moderator

OP, don’t worry about “new” fluids causing leaks. Not applicable in the vast majority of scenarios and definitely not applicable in your case.
However it appears you also believe there is an issue with the rear end. Cover needs to come off to inspect or verify anything, so if you’re chasing that issue, even if there’s no issue, new fluid needs to go back in anyways.


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EMD360

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Posted: 12/21/21 02:03pm Link  |  Quote  |  Print  |  Notify Moderator

Grease Monkey does a 16 point inspection and I’ve found that should include the differential but I can’t find the details on the GM inspection points. The paperwork is in the RV. I’ll have to see what it says.

Edit:
I found this online for Grease Monkey.
Its 16-point inspection consists of the following checks and maintenance procedures: wash exterior windows, vacuum interior, check/fill battery fluid, check air filter, check windshield wiper blades, check breather element and PCV valve, check/fill windshield washer fluid, check all exterior lights, check/fill transmission or trans-axle fluid, check radiator level and test coolant, check/fill power steering fluid, install new oil filter, change oil (up to 5 quarts), lubricate chassis, check/fill differential fluid, and check and set tire pressure. Grease Monkey technicians also visually inspect hoses and belts.

* This post was edited 12/21/21 03:18pm by EMD360 *

enblethen

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Posted: 12/22/21 12:40pm Link  |  Quote  |  Print  |  Notify Moderator

OP: you didn't say whether there was any signs of a leak?


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EMD360

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Posted: 12/22/21 03:21pm Link  |  Quote  |  Print  |  Notify Moderator

I didn’t notice a leak. Still waiting to pick it up but the shop said it was ok and just performed regular maintenance. They did not mention a leak either just that fluid was low. I have since read that metal shavings are common and not a problem. They should have been cleaned out with the fluid change.

enblethen

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Posted: 12/22/21 06:10pm Link  |  Quote  |  Print  |  Notify Moderator

Seems strange to have lost fluid with no evidence.

enblethen

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Posted: 12/23/21 11:30am Link  |  Quote  |  Print  |  Notify Moderator

I remembered that most differentials have a vent. If it is clogged pressure can build up and blow fluid through seals while it is hot.

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