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Oil Change Ready to change the oil in your Dodge Ram? Engine -Trans - Differential - Transfer Case


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  #1  
Old 06-25-2011, 05:34 PM
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Default Rear End Oil Change

Ok maybe some can help me here I want to change the differential oil in the rear so I went to Kragen auto part store and ask for the gear oil and LSD oil for my 2010 Dodge Ram 1500 4x2 and he showed me 4 to 5 different brands and wights and one type 4oz LSD oil some where synthetic and regular gear oil. My question is what brand / weight gear oil to use, synthetic or regular and how many bottles does it take and how often does it need to be changed . any help would be great. Thank you

Last edited by Drkangel1; 06-25-2011 at 06:38 PM.
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Old 06-25-2011, 06:53 PM
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your rear end only uses SYNTHETIC fluid

You need to look at your owners manual for types & capacities
i believe that only 4X4 & 2x4 with Limited Slip Differential use LSD fluid

as far as Kragen/Oreilly goes, their people were either in high school within the last year or 2 & always ride a bicycle or a skateboard
They probably couldn't show you where your dipstick was located

Next time you should go to NAPA, at least they only use the computer to double check part numbers
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Old 06-25-2011, 09:59 PM
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Quote:
Originally Posted by GTyankee View Post
your rear end only uses SYNTHETIC fluid

You need to look at your owners manual for types & capacities
i believe that only 4X4 & 2x4 with Limited Slip Differential use LSD fluid

as far as Kragen/Oreilly goes, their people were either in high school within the last year or 2 & always ride a bicycle or a skateboard
They probably couldn't show you where your dipstick was located

Next time you should go to NAPA, at least they only use the computer to double check part numbers
For rear ends the oil used can be either synthetic, conventional, or blend. He would be using a hypoid gear oil which most are because they are backwards compatible so it would just make sense to make just hypoid. Anyways because you have a LSD you need a Posi-Trac additive. You can go to the local autozone and get Trans-X Posi-Trac Additive, it's sold usually by the tube, it's an additive for the LSD clutch's etc. Anyway's the weight depends on the temperture that the truck will most likely operate in and what kind of use for the truck. If you do alot of towing I think you would use 75-140, I use 80-90 because I can use it in both high and low temp environments, but their is some restrictions such as if I do towing but the oil will still do it's job just might get a little bit hotter. Anyways if you look in the owners manual their will be a chart with weights and temps along with oil weights that would be best for using in a towing environment. I changed my differential fluid and just used 2 Bottles of Valvoline 80-90 and a tube of additive even though I don't have a LSD. The additive isn't going to do any harm in a differential without LSD, BUT IT IS NEEDED IF YOU HAVE A LSD. Anyways, the manufacture uses RTV for the axle housing gasket, but I used a felpro gasket and I put RTV on both sides of the gasket. I didn't fully trust using RTV or using just a paper gasket so I did both and it might prove to have been smart when I do my next gear oil change because the paper gasket will help with removing more RTV then just trying to scrape it etc... I have the chrysler 9.25 axle with a 3.55 ratio (typical)... Anyways when you put the cover back on torque the bolts to 30 Ft/Lbs once the sealant is dried. Well really just put the cover on with the sealant etc then finger tighten the bolt to the RTV seeps out of the sides of the cover and axle, then wait about 1-2 hours and then fully tighten the bolts to 30FT/LBS and then you can put gear oil in, BE SURE TO PUT THE ADDITIVE IN FIRST!


Part of this reply is for the person who posted this thread.

Excuse any grammer mistakes etc, I can't see very well and I am a little under the weather so bare with me here. Thanks

Last edited by ramvan2500; 06-25-2011 at 10:01 PM.
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Old 06-26-2011, 04:42 AM
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I want to thank GTyankee and Ramvan2500 for taking your time to reply to my post, all your information and input will be of great help agin thank you.
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Old 06-26-2011, 11:47 AM
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If you tow be sure to use 75-140w. ( my stock gear lube got cooked towing 7500lbs). I always use a brand named synthetic like Royal Purple, or Valvoline so no LS additive is needed.
You may want to research on adding too much limited slip additive to a LSD as it can cause the clutches to slip too much (stop working).
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Last edited by westxsrt10; 06-26-2011 at 02:13 PM. Reason: info. added
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Old 06-26-2011, 01:42 PM
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Quote:
Originally Posted by westxsrt10 View Post
If you tow be sure to use 75-140w. ( my stock gear lube got cooked towing 7500lbs). I always use a brand named synthetic like Royal Purple, or Valvoline so no LS additive is needed.
An additive is still recommended because the additive is a friction modifier much like ATF is a friction modifier, the LSD consist of clutches much like a transmission consist of friction plates and steels that are made to be known as clutch packs. So the additive is a good idea, and yea that stock oil I'm sure cooked very good, valvoline is all I use and nothing else. Great Stuff!


Anyways yes like I told him 75-140 would be best for towing, but their are others that can be used, it just sucks though when you have to keep changing gear oils left and right... But you got to take care of the truck you want it to keep running
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Old 06-26-2011, 01:43 PM
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Quote:
Originally Posted by DRKANGEL View Post
I want to thank GTyankee and Ramvan2500 for taking your time to reply to my post, all your information and input will be of great help agin thank you.
You're very welcome and I know I am more than happy to help you with anything in the world with your truck, just knock on my door and help is on the way.
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Old 06-26-2011, 03:57 PM
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Agin Ramvan2500 thank you agin for all your help and too every one else for there input this fourm is one of the best.
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Old 06-26-2011, 04:42 PM
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DRKANGEL
this is from the 2010 Ram Owners Manual
Page 555 Fluid types

Rear Axle – 1500 Models MOPAR Synthetic Gear Lubricant SAE 75W-140 (MS-8985).
it does NOT read it but equivalent fluid is acceptable

Limited-Slip
Rear Axles require the addition of 118 ml (4 oz.) MOPAR Limited Slip
Additive or equivalent.
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Old 06-26-2011, 06:22 PM
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Thank you GTyankee
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