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#4777159 - 06/04/18 11:39 AM Opinions on diff fluid change with mityvac?
monster1 Offline


Registered: 01/31/10
Posts: 114
Loc: ca
Hey guys, I'm wanting to change my diff gear oil in my 04 2500 5.9l cummins 4x4. Should I completely pull the covers or will using a mityvac suck and swap be ok? Odometer is about 75k. First service.

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#4777181 - 06/04/18 12:11 PM Re: Opinions on diff fluid change with mityvac? [Re: monster1]
nthach Offline


Registered: 01/02/04
Posts: 3893
Loc: California
If you can get the Mityvac to pick up from the bottom of the diff, I think it should work but it could struggle with the thicker gear oil. I would try it with the diff oil warm.

Pulling the diff cover isn't a bad idea if not messy. I would go that way to avoid any drama. If you were planning on swapping diff covers to a Mag-Hytec or similar with a drain plug it's also a good time.

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#4777225 - 06/04/18 12:43 PM Re: Opinions on diff fluid change with mityvac? [Re: monster1]
229 Offline


Registered: 06/23/11
Posts: 748
Loc: Mid Atlantic
Slow but better than not refreshing. Pull the covers so you can wipe out the slime. Use Mopar gear RTV or compatible black gear oil RTV silicone.

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#4777249 - 06/04/18 01:09 PM Re: Opinions on diff fluid change with mityvac? [Re: monster1]
monster1 Offline


Registered: 01/31/10
Posts: 114
Loc: ca
I'll pull the covers. Thanks.

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#4777397 - 06/04/18 04:06 PM Re: Opinions on diff fluid change with mityvac? [Re: monster1]
monster1 Offline


Registered: 01/31/10
Posts: 114
Loc: ca
Pulled the cover to the rear. Gear oil was dark. But no shavings and everything was really clean. Put in 3 quarts of Lucas full synthetic 75w-90 and tightened everything back up. I think the front diff will wait for now since the rear was so clean. Too dang hot for me to be working in the sun.


Edited by monster1 (06/04/18 04:07 PM)

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#4777405 - 06/04/18 04:10 PM Re: Opinions on diff fluid change with mityvac? [Re: monster1]
JEL01 Offline


Registered: 09/24/15
Posts: 117
Loc: Rainville, USA
Good on you for taking care of it,
You are now ahead of 99% of other drivers, BITOGers excluded smile
_________________________
Cars I maintain:
02 MB CLK430-Edge 0w40
05 Honda Accord V6-Maxlife 5w30
13 Lexus RX350 AWD-M1 AFE 0w20
02 Toyota Tundra 4x4 M1 5w30

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#4777424 - 06/04/18 04:27 PM Re: Opinions on diff fluid change with mityvac? [Re: monster1]
Billy_D Offline


Registered: 06/23/08
Posts: 1021
Loc: midwest
I donít bother pulling the cover on my truck. I just use an oil extractor every 40k miles. The process is painfully slow.

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#4777439 - 06/04/18 04:45 PM Re: Opinions on diff fluid change with mityvac? [Re: monster1]
demarpaint Offline


Registered: 07/03/05
Posts: 29747
Loc: NY
Originally Posted By: monster1
I'll pull the covers. Thanks.


If you don't have a drain plug, that's what I'd do. thumbsup
_________________________
God Bless Our Troops


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#4778998 - 06/06/18 11:13 AM Re: Opinions on diff fluid change with mityvac? [Re: monster1]
monster1 Offline


Registered: 01/31/10
Posts: 114
Loc: ca
I towed my 4k lb boat yesterday on a 50 mile round trip. I know this is nothing for a 3/4 ton truck but the lazer thermometer showed the differential running at 150 degrees in 100 degree heat. Looks like that Lucas synthetic gear oil does it's job. I was a bit concerned I made a wring choice if lubricants because it's not a very popular product as far as the internet is concerned.

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#4779556 - 06/06/18 08:05 PM Re: Opinions on diff fluid change with mityvac? [Re: monster1]
zeng Online   content


Registered: 09/01/15
Posts: 2188
Loc: Malaysia
150F diff temperature towing is fantastic for Lucas 75W90 with a high [email protected]*C of 142 cSt.

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