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Opinions on diff fluid change with mityvac? #4777159
06/04/18 11:39 AM
06/04/18 11:39 AM
Joined: Jan 2010
Posts: 132
ca
monster1 Offline OP
monster1  Offline OP

Joined: Jan 2010
Posts: 132
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.

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777181
06/04/18 12:11 PM
06/04/18 12:11 PM
Joined: Jan 2004
Posts: 5,273
California
nthach Offline
nthach  Offline

Joined: Jan 2004
Posts: 5,273
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.

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777225
06/04/18 12:43 PM
06/04/18 12:43 PM
Joined: Jun 2011
Posts: 752
Mid Atlantic
229 Offline
229  Offline

Joined: Jun 2011
Posts: 752
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.

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777249
06/04/18 01:09 PM
06/04/18 01:09 PM
Joined: Jan 2010
Posts: 132
ca
monster1 Offline OP
monster1  Offline OP

Joined: Jan 2010
Posts: 132
ca
I'll pull the covers. Thanks.

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777397
06/04/18 04:06 PM
06/04/18 04:06 PM
Joined: Jan 2010
Posts: 132
ca
monster1 Offline OP
monster1  Offline OP

Joined: Jan 2010
Posts: 132
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.

Last edited by monster1; 06/04/18 04:07 PM.
Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777405
06/04/18 04:10 PM
06/04/18 04:10 PM
Joined: Sep 2015
Posts: 184
Rainville, USA
JEL01 Offline
JEL01  Offline

Joined: Sep 2015
Posts: 184
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 Mercedes CLK430-Edge 0w40
05 Honda Accord V6-Maxlife 5w30
13 Lexus RX350 AWD-M1 AFE 0w20
02 Toyota Tundra 4x4 M1 5w30
Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4777424
06/04/18 04:27 PM
06/04/18 04:27 PM
Joined: Jun 2008
Posts: 1,038
midwest
Billy_D Offline
Billy_D  Offline

Joined: Jun 2008
Posts: 1,038
midwest
I don’t 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 04:45 PM
06/04/18 04:45 PM
Joined: Jul 2005
Posts: 32,340
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 32,340
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

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4778998
06/06/18 11:13 AM
06/06/18 11:13 AM
Joined: Jan 2010
Posts: 132
ca
monster1 Offline OP
monster1  Offline OP

Joined: Jan 2010
Posts: 132
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.

Re: Opinions on diff fluid change with mityvac? [Re: monster1] #4779556
06/06/18 08:05 PM
06/06/18 08:05 PM
Joined: Sep 2015
Posts: 2,626
Malaysia
zeng Offline
zeng  Offline

Joined: Sep 2015
Posts: 2,626
Malaysia
150F diff temperature towing is fantastic for Lucas 75W90 with a high [email protected]*C of 142 cSt.

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