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02-06-2017, 12:16 AM
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#1
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Senior Member
Thor Owners Club iRV2 No Limits Club
Join Date: Mar 2016
Posts: 267
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Diff fluid change interval
How often are you all that pull changing diff fluid? Just following the recommended interval even if you're pulling or are more often? Less often?
__________________
2018 Venture Rv Sonic Lite 167VMS
2008 F150 with only 50k miles!!!!
2 Chihuahua's - yeah, were those people at the campground
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02-06-2017, 04:00 AM
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#2
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Senior Member
Join Date: Sep 2012
Posts: 542
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You should refer to your owners manual... for sure change more often if towing.
I use Amsoil Severe Gear, and change it every 75k.
__________________
2014 Ram 3500 CCLB 4x4 Dually 68RFE, 370/800 Cummins 3.42 highway gear - Deep Cherry Red
2016 Coachmen Chapparal 360IBL
Sold - 2005 Dodge Ram 2500 SLT QCLB 4x4 - Cummins Power
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02-06-2017, 05:00 AM
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#3
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Registered User
Join Date: Aug 2014
Posts: 1,346
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Towing heavy as I do (33K combined) the SevereGear AMZ/OIL 75-110 can't be beat.
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02-06-2017, 05:27 AM
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#4
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Senior Member
Join Date: Jan 2017
Location: Little Rock, Arkansas
Posts: 2,594
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Quote:
Originally Posted by chertz
You should refer to your owners manual... for sure change more often if towing.
I use Amsoil Severe Gear, and change it every 75k.
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How about the first change. I'm an Amsoil user myself and have wondered how long to go before switching over.
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02-06-2017, 05:34 AM
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#5
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Registered User
Join Date: Aug 2014
Posts: 1,346
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Quote:
Originally Posted by EdInArk
How about the first change. I'm an Amsoil user myself and have wondered how long to go before switching over.
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No Idea what you are driving but I would change out at 5K.
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02-06-2017, 05:39 AM
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#6
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Senior Member
Join Date: Jan 2017
Location: Little Rock, Arkansas
Posts: 2,594
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Quote:
Originally Posted by Cummins12V98
No Idea what you are driving but I would change out at 5K.
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LOL ...
I wandered off into a different forum and didn't realize it. I'm driving an F53 Ford based A class. Nonetheless, the question was serious. Yeah, I thought I'd get the final drive upgraded to Amsoil right away.
Thx
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02-06-2017, 05:42 AM
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#7
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Senior Member
Join Date: Sep 2012
Posts: 542
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I always change diff fluid to Amsoil as soon as I buy a truck (I always have bought used) and then start my routine from there.
__________________
2014 Ram 3500 CCLB 4x4 Dually 68RFE, 370/800 Cummins 3.42 highway gear - Deep Cherry Red
2016 Coachmen Chapparal 360IBL
Sold - 2005 Dodge Ram 2500 SLT QCLB 4x4 - Cummins Power
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02-06-2017, 07:52 AM
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#8
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Registered User
Join Date: Aug 2014
Posts: 1,346
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My 2011 RAM Dually towing a 28K combined for over 1/2 of it's 65K I changed out to AMZ/OIL SevereGear 75-110 at around 5K. The pic is at near 65k, the ring gear shows very little wear. The fluid came out translucent dark brown.
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02-06-2017, 08:40 AM
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#9
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Moderator Emeritus
Join Date: Jun 2011
Location: HillBilly country, Smokey Mtns
Posts: 4,171
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Quote:
Originally Posted by Starbreaker
How often are you all that pull changing diff fluid? Just following the recommended interval even if you're pulling or are more often? Less often?
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The Owner's Guide for my '99.5 F-250 said it was good for the life of the truck when filled with synthetic. The Owner's Guide for my 2012 F-150 is hiding from me at the moment, but I'll bet it says the same thing. Both my 99.5 F-250 and my 2012 F-150 require SAE 75W-140 Synthetic Rear Axle Lubricant. Lighter duty trucks may require SAE 75W90 Synthetic Rear Axle Lubricant
Quote:
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Originally Posted by Ford
Rear axles containing synthetic lubricant and light duty trucks equipped with Ford-design axles are lubricated for life. These lubricants are not to be checked or changed unless a leak is suspected, service is required or the axle assembly has been submerged in water. The axle lubricant should be changed anytime the axle has been submerged in water.
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And of course that assumes you never exceed the weight limits, especially the GCWR, of your tow vehicle. Your Owner's Guide may be different.
But I preferred to be a bit more careful and changed my rear axle lube at about 100,000 miles, using Mobil 1 Synthetic gear lube. Here's the hype for Mobil 1:
https://mobildelvac.com/en/ancillary...vac-1-gear-oil
The Amsoil hype is just that = hype. All major oil companies sell full- synthetic gear lube that meets the specs of your Ford. Amsoil may be just as good, but it's certainly not better Than Mobil 1 or Shell or any other major oil company brand.
__________________
Grumpy ole man with over 60 years towing experience. Now my heaviest trailer is a 7'x16' 5,000-pound flatbed utility trailer, my tow vehicle is a 2019 F-150 Lariat 3.5L EcoBoost SuperCab with Max Tow (1,904 pounds payload capacity). 
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02-06-2017, 04:26 PM
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#10
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Senior Member
Join Date: Dec 2013
Posts: 1,846
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I believe that most new trucks now come with synthetic differential fluid. That being said I will probably change both diff and the transfer case fluids at 30 - 40K. I want my new SD to last a long time.
Transmission fluid is now synthetic and good for supposedly 150 K. Will change that at 50 K.
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02-06-2017, 05:31 PM
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#11
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Member
Join Date: Mar 2016
Posts: 37
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I know all the searching I did on my 2011 1500 Silverado 4x4 said that the differentials were the weak point of the truck. That being said I changed the oils last summer at about 55000. I never had any problem with the truck and would do at least 1 camping run of about 1600 miles round trip. So that being said I would change the oil every 2 to 3 years depending on how much I tow along with the length of the tow
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02-06-2017, 08:47 PM
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#12
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Moderator Emeritus
Join Date: Jun 2011
Location: HillBilly country, Smokey Mtns
Posts: 4,171
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Quote:
Originally Posted by SmokeyWren
The Owner's Guide for my '99.5 F-250 said it was good for the life of the truck when filled with synthetic. The Owner's Guide for my 2012 F-150 is hiding from me at the moment, but I'll bet it says the same thing.
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Yep. I found the Owner's Guide for the 2012 F-150, and sure enough it does say the same thing about the rear diff lube. However, deeper in the F-150 maintenance schedule, it says that the synthetic rear diff lube should be changed at 150,000 miles. So I plan to change mine at about 100,000 miles.
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02-10-2017, 05:11 PM
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#13
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Registered User
Outdoors RV Owners Club
Join Date: Jan 2015
Posts: 348
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lower mileage than spec'd
did my rear diff @ ~30,000 miles
tranny fluid @ ~42,000 miles
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