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75k and never changed diff fluid #4629311
01/09/18 01:43 PM
01/09/18 01:43 PM
Joined: Jan 2010
Posts: 129
ca
monster1 Offline OP
monster1  Offline OP
Joined: Jan 2010
Posts: 129
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.

Re: 75k and never changed diff fluid [Re: monster1] #4629317
01/09/18 01:52 PM
01/09/18 01:52 PM
Joined: Apr 2016
Posts: 971
KS
FordBroncoVWJeta Online content
FordBroncoVWJeta  Online Content
Joined: Apr 2016
Posts: 971
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.


2017 Volkswagen Jetta 1.4T - 2015 Honda CRV 2.4 - 2012 Volkswagen Jetta 2.0 - 2001 Pontiac Sunfire 2.2
Re: 75k and never changed diff fluid [Re: monster1] #4629318
01/09/18 01:53 PM
01/09/18 01:53 PM
Joined: Sep 2015
Posts: 142
Rainville, USA
JEL01 Offline
JEL01  Offline
Joined: Sep 2015
Posts: 142
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.


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
Re: 75k and never changed diff fluid [Re: monster1] #4629328
01/09/18 01:59 PM
01/09/18 01:59 PM
Joined: Dec 2017
Posts: 3,040
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 3,040
SE British Columbia, Canada
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


If you want the job done right......do it yourself.
Re: 75k and never changed diff fluid [Re: monster1] #4629343
01/09/18 02:13 PM
01/09/18 02:13 PM
Joined: Oct 2014
Posts: 12,591
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,591
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 .


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: 75k and never changed diff fluid [Re: monster1] #4629361
01/09/18 02:40 PM
01/09/18 02:40 PM
Joined: Feb 2009
Posts: 8,806
Texas
440Magnum Offline
440Magnum  Offline
Joined: Feb 2009
Posts: 8,806
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.)


'66 Dodge Polara & '69 Dodge Coronet R/T both 440/727
'08 Ram 1500 4.7/545RFE
'12 Challenger SRT8 392/6-speed
'99 XJ 4x4 4.0/AX15, '14 WK2 4x4 3.6/8HP
Re: 75k and never changed diff fluid [Re: monster1] #4629402
01/09/18 03:29 PM
01/09/18 03:29 PM
Joined: Jun 2005
Posts: 11,622
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,622
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.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: 75k and never changed diff fluid [Re: monster1] #4629475
01/09/18 04:27 PM
01/09/18 04:27 PM
Joined: Aug 2011
Posts: 3,268
n.c.
gman2304 Offline
gman2304  Offline
Joined: Aug 2011
Posts: 3,268
n.c.
My 05 Chevy Avalanche just tripped 193,000 on the FF. Iíll change mine soon.

Re: 75k and never changed diff fluid [Re: CT8] #4629522
01/09/18 05:11 PM
01/09/18 05:11 PM
Joined: Oct 2004
Posts: 8,337
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 8,337
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).


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: 75k and never changed diff fluid [Re: monster1] #4629530
01/09/18 05:17 PM
01/09/18 05:17 PM
Joined: Jul 2005
Posts: 30,996
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,996
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.


God Bless Our Troops

Re: 75k and never changed diff fluid [Re: demarpaint] #4629579
01/09/18 06:10 PM
01/09/18 06:10 PM
Joined: Oct 2014
Posts: 4,050
Utah
CKN Offline
CKN  Offline
Joined: Oct 2014
Posts: 4,050
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.

Re: 75k and never changed diff fluid [Re: monster1] #4629595
01/09/18 06:20 PM
01/09/18 06:20 PM
Joined: Dec 2016
Posts: 7,199
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,199
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!


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: 75k and never changed diff fluid [Re: monster1] #4629789
01/09/18 08:41 PM
01/09/18 08:41 PM
Joined: Jan 2011
Posts: 2,837
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,837
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.

Last edited by Lubener; 01/09/18 08:44 PM.

The "thinking" man's friend.
Re: 75k and never changed diff fluid [Re: monster1] #4629854
01/09/18 10:10 PM
01/09/18 10:10 PM
Joined: Sep 2009
Posts: 466
indiana
dakota99 Offline
dakota99  Offline
Joined: Sep 2009
Posts: 466
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.

Re: 75k and never changed diff fluid [Re: monster1] #4629895
01/09/18 11:11 PM
01/09/18 11:11 PM
Joined: Nov 2017
Posts: 683
South Carolina
eyeofthetiger Offline
eyeofthetiger  Offline
Joined: Nov 2017
Posts: 683
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.


2017 Ford Fiesta 1.0T - Valvoline SynPower 5W-20, Motorcraft FL910S
1988 GMC K1500 4.3/700R4 - Supertech 15W-40, Fram TG3980
1986 Ford Ranger 2.0 - uhh
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