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#4629311 - 01/09/18 01:43 PM 75k and never changed diff fluid
monster1 Offline


Registered: 01/31/10
Posts: 114
Loc: ca
I have an 04 2500 4 x 4 dodge with 5.9 Cummins. I've never changed the fluid out of my diff as it's always been out of sight out if mind. I've learned this is something I should have done some time ago. Anyway, first off, have I killed my gears? I don't drive the truck hard and I only occasional tow a 5k trailer. Second, what weight gl-5 synthetic gear oil am I supposed to use? I'd look it up in the owners manual but I've never had one. Also, is it as simple as draining with a mityvac and refilling or do I need to make a mess and remove the covers? As always, thanks for the helpful replies.

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#4629317 - 01/09/18 01:52 PM Re: 75k and never changed diff fluid [Re: monster1]
FordBroncoVWJeta Offline


Registered: 04/16/16
Posts: 765
Loc: KS
Highly doubt you damaged it. There are TONS of people that go 200K and never change it. On the Trailblazer it never was changed till 110K. No damage. Although I would change it at this point VERY easy to do.
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#4629318 - 01/09/18 01:53 PM Re: 75k and never changed diff fluid [Re: monster1]
JEL01 Online   content


Registered: 09/24/15
Posts: 117
Loc: Rainville, USA
Your gears are fine, FWIW I did the mityvac method on my old 99 F359 and seapped it with Mobil 1 75w140 for the first time at over 200k shocked when I got it, so 75k is not bad. What does the interwebs call for? I suspect itís the same as my old truck, check Amsoilís site for the exact specs for your truck.
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Cars I maintain:
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13 Lexus RX350 AWD-M1 AFE 0w20
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#4629328 - 01/09/18 01:59 PM Re: 75k and never changed diff fluid [Re: monster1]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1680
Loc: Alberta
Not a problem. Get on RAM.com or Dodge.com and you should be able to look up your owners manual.

To be honest, most truck makers do not suggest you need to change the rear diff for the first 150,000 miles unless you have severe service like lots of towing or going off-road. It's only us gear heads who do. (Ever wonder why there is no drain plug on the rear diff?).

Take a look at your owners manual and feel free to bring up any issues.

One more thing. Your transfer case does need changes. For severe service (which I like to use), it is usually 50,000 miles or so. Most people think, front diff, transfer case and rear diff. It should be front diff, rear diff and 3 times more for the transfer case.

You need to make a mess and take off the rear cover. That way you can clean out any gear shavings.

SF

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#4629343 - 01/09/18 02:13 PM Re: 75k and never changed diff fluid [Re: monster1]
CT8 Offline


Registered: 10/09/14
Posts: 10920
Loc: Idaho
Originally Posted By: monster1
I have an 04 2500 4 x 4 dodge with 5.9 Cummins. I've never changed the fluid out of my diff as it's always been out of sight out if mind. I've learned this is something I should have done some time ago. Anyway, first off, have I killed my gears? I don't drive the truck hard and I only occasional tow a 5k trailer. Second, what weight gl-5 synthetic gear oil am I supposed to use? I'd look it up in the owners manual but I've never had one. Also, is it as simple as draining with a mityvac and refilling or do I need to make a mess and remove the covers? As always, thanks for the helpful replies.
The owners manual has the recommended viscosity .
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#4629361 - 01/09/18 02:40 PM Re: 75k and never changed diff fluid [Re: monster1]
440Magnum Offline


Registered: 02/01/09
Posts: 8754
Loc: Texas
Originally Posted By: monster1
I have an 04 2500 4 x 4 dodge with 5.9 Cummins. I've never changed the fluid out of my diff as it's always been out of sight out if mind. I've learned this is something I should have done some time ago. Anyway, first off, have I killed my gears? I don't drive the truck hard and I only occasional tow a 5k trailer. Second, what weight gl-5 synthetic gear oil am I supposed to use? I'd look it up in the owners manual but I've never had one. Also, is it as simple as draining with a mityvac and refilling or do I need to make a mess and remove the covers? As always, thanks for the helpful replies.


Unless the fluid got water in it, you've probably done zero harm. Heck, my 73 Satellite went close to 200k (with some trailer towing) on a lightweight 8.25 rear gear before the fluid ever got changed, and it proceeded to continue quite happily until over 240,000 miles (still going when I sold the car). Solid axle differentials are notoriously tough, with a few exceptions. None of those exceptions show up under a 3/4 ton Ram (unfortunately, half tone Rams do get the 9.25, which has a lot of reliability problems due to the tooling being so old.)
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#4629402 - 01/09/18 03:29 PM Re: 75k and never changed diff fluid [Re: monster1]
bdcardinal Offline


Registered: 06/03/05
Posts: 10976
Loc: Santa Barbara, CA
I wouldn't worry about it. I'm sure if you went to a junkyard, most of the vehicles have the factory fill diff and trans fluid.
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#4629475 - 01/09/18 04:27 PM Re: 75k and never changed diff fluid [Re: monster1]
gman2304 Offline


Registered: 08/11/11
Posts: 3047
Loc: n.c.
My 05 Chevy Avalanche just tripped 193,000 on the FF. Iíll change mine soon.

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#4629522 - 01/09/18 05:11 PM Re: 75k and never changed diff fluid [Re: CT8]
bullwinkle Offline


Registered: 10/09/04
Posts: 7649
Loc: Cincinnati, OH, USA
Originally Posted By: CT8
Originally Posted By: monster1
I have an 04 2500 4 x 4 dodge with 5.9 Cummins. I've never changed the fluid out of my diff as it's always been out of sight out if mind. I've learned this is something I should have done some time ago. Anyway, first off, have I killed my gears? I don't drive the truck hard and I only occasional tow a 5k trailer. Second, what weight gl-5 synthetic gear oil am I supposed to use? I'd look it up in the owners manual but I've never had one. Also, is it as simple as draining with a mityvac and refilling or do I need to make a mess and remove the covers? As always, thanks for the helpful replies.
The owners manual has the recommended viscosity .
75W90, I have RP full syn Severe Gear in mine, along with the oversize rear diff cover (Mag-Hytec).
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#4629530 - 01/09/18 05:17 PM Re: 75k and never changed diff fluid [Re: monster1]
demarpaint Offline


Registered: 07/03/05
Posts: 29736
Loc: NY
I know plenty of people who sent their vehicles to the junkyard with the differential fluid that the vehicle rolled off the assembly line with. Many with hundreds of thousands of miles on them.
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#4629579 - 01/09/18 06:10 PM Re: 75k and never changed diff fluid [Re: demarpaint]
CKN Offline


Registered: 10/14/14
Posts: 3680
Loc: Utah
Originally Posted By: demarpaint
I know plenty of people who sent their vehicles to the junkyard with the differential fluid that the vehicle rolled off the assembly line with. Many with hundreds of thousands of miles on them.


^^^^^^^^^^^^^^^^^^^^^^^^
THIS-they don't seem to wear out under normal use.

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#4629595 - 01/09/18 06:20 PM Re: 75k and never changed diff fluid [Re: monster1]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Early 90's Dana 70 rears had some side carrier bearing problems, but it sounds like yours has had an EASY life so far!
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#4629789 - 01/09/18 08:41 PM Re: 75k and never changed diff fluid [Re: monster1]
Lubener Offline


Registered: 01/22/11
Posts: 2574
Loc: N.Ohio
I never change differential oil unless it has to be opened up for some reason. That only happened once in 38 years for an axle seal. I make sure the level is up and that's it. I doubt your diff. has been damaged and is the most durable component on your truck.


Edited by Lubener (01/09/18 08:44 PM)
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#4629854 - 01/09/18 10:10 PM Re: 75k and never changed diff fluid [Re: monster1]
dakota99 Offline


Registered: 09/27/09
Posts: 463
Loc: indiana
I changed the factory fill diff fluid in my 99 Dakota at 90k just out of a combination of boredom and curiosity. One word of caution, differential oil smells terrible. I mean i canít even describe it. FF looked fine to me. I cleaned the magnet and filled it back up with Mobil 1 and some slip lock? additive. I canít remember the name exactly. It made noise with just the mobil 1 and no additive.

Iím guessing I wonít need to do it again with a good quality oil in there now.

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#4629895 - 01/09/18 11:11 PM Re: 75k and never changed diff fluid [Re: monster1]
eyeofthetiger Offline


Registered: 11/18/17
Posts: 683
Loc: South Carolina
I suspect that my '88 GMC has the factory fill in the rear end, but it doesn't make noise or have excessive play. I have a mini spool waiting to be installed, so it will be taken care of soon enough.
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