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Opinions on diff fluid change with mityvac? #4777159 06/04/18 10:39 AM
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monster1 Offline OP
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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.

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777181 06/04/18 11:11 AM
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nthach Online Content
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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.

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777225 06/04/18 11:43 AM
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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.

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777249 06/04/18 12:09 PM
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monster1 Offline OP
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I'll pull the covers. Thanks.

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777397 06/04/18 03:06 PM
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monster1 Offline OP
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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.

Last edited by monster1; 06/04/18 03:07 PM.
Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777405 06/04/18 03:10 PM
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JEL01 Offline
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Good on you for taking care of it,
You are now ahead of 99% of other drivers, BITOGers excluded smile


Cars I maintain:
02 Mercedes CLK430
09 Honda Accord V6
13 Lexus RX350 AWD
02 Toyota Tundra 4x4
18 Lexus GX460
Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777424 06/04/18 03:27 PM
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Billy_D Offline
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I donít bother pulling the cover on my truck. I just use an oil extractor every 40k miles. The process is painfully slow.

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777439 06/04/18 03:45 PM
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demarpaint Offline
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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

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4778998 06/06/18 10:13 AM
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monster1 Offline OP
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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.

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4779556 06/06/18 07:05 PM
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zeng Offline
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150F diff temperature towing is fantastic for Lucas 75W90 with a high [email protected]*C of 142 cSt.

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