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General Dakota Board
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DrDakota
Dodge Dakota
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1/03/2004
15:19:24
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 Subject: Differential Gear Oil
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Message:
I am about to change the fluid (gear oil) in my differentials. I have a 2001 Dak w/ AWD and LSD. I am planning on using Amsoil. Here are my questions...
How much fluid does each differential take (I know there are a lot of factors in deciding this, an approximate value will be fine, I need to know how much to buy).
Amsoil has a new '2000' series gear oil, anyone use this yet? There website says you don't need to add Friction Modifier, has anyone experienced that they need to add any more?
Last, but not least...I know the transfer case needs approximately 1.2 quarts of fluid, but what fluid? Gear oil, same as the diffs? Do I need friction modifier in the AWD (full-time) transfer case?
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DrDakota
Dodge Dakota
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1/03/2004
20:50:58
|  RE: Differential Gear Oil
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Message:
Bump.
C'mon guys, I know atleast a few of you guys have changed your Diff Oil...can't you remember how much you bought? A quart per diff...two quarts per diff?
I know a lot of you guys tout Amsoil too! Am I going to have to revert to a Chevy forum for those tough Amsoil questions....I always thought the Dodge guys were the smart ones...
I know the transfer case question is a hard one, c'mon think...I know you can! Anyone have a manual...experience or can ask your Dad?
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Mark
Forum Moderator
1/03/2004
22:14:04
| RE: Differential Gear Oil
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Message:
You can probably check your owners manual. I have an 8.25" rear and I think two quarts did it
-Mark Hryckiewicz
1993 Sport RC SB 5.2L Auto
Mark.DodgeDakotas.com
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BlkDakDave
GenIII
 
1/03/2004
22:48:53
| RE: Differential Gear Oil
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I use Amsoil series 2000 and found that I needed to use the Friction Modifier. As I recall, it took two quarts for the rear(9.25) and one + some for the front.
NEVER FORGET!
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DrDakota
Dodge Dakota
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1/04/2004
01:00:26
| RE: Differential Gear Oil
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Message:
Thanks guys, I knew there were still some helpful DD.Com'ers out there.
BlkDakDave- Tell me more...I take it that you used the '2000' then had problems with your LSD and had to add more Friction Modifier?
What about the Amsoil (non-2000) gear oil? Now that I have a quantity to buy, I'm a little bit scared which to buy?
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AmsoilSponsor
DakotaEnthusiast
1/04/2004
09:16:43
|  Amsoil Series 2000 Synthetic Differential Gear Oil
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DrDakota,
I don't have the quantity information available --- please refer to your Owners Manual --- but I would like to add the following (perhaps you have seen it on other threads --- I am reposting just in case you have not read it before. For those of you that have read it before --- please bear with me.)
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FYI - Gear Lube Information:
High quality gear oils must lubricate, cool and protect geared systems. They must also carry damaging wear debris away from contact zones and muffle the sound of gear operation. Commonly used in differential gears and standard transmission applications in commercial and passenger vehicles, as well as a variety of industrial machinery, gear oils must offer extreme temperature and pressure protection in order to prevent wear, pitting, spalling, scoring, scuffing and other types of damage that result in equipment failure and downtime. Protection against oxidation, thermal degradation, rust, copper corrosion and foaming is also important.
AMSOIL Series 2000 Synthetic 75W-90 Gear Lube delivers unbeatable protection and fuel economy (independent testing shows class 8 vehicles with AMSOIL Series 2000 Synthetic 75W-90 Gear Lube in the differentials obtained up to 4.83 percent more mpg than vehicles equipped with another popular gear lube). Amsoil Synthetic Gear Lube has the film strength required to deliver all the protection heavy-duty and high-stress applications need in a fuel-saving viscosity grade. AMSOIL Series 2000 Synthetic 75W-90 Gear Lube is recommended for use in all passenger vehicles, commercial trucks and race vehicles.
AMSOIL 75W-90, 80W-90 AND 85W-140 Gear Lubes exceed the lubrication and performance requirements for gear boxes where API MT-1, GL-4 or GL-5 lubricants are specified.
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I am going to quote an old friend from this site ... Sandman ... whom we have not heard from in a while. Hope everything is okay Sandman!
... and I quote: "GM recomends 100,000 to 150,00 mile drain intervals. This is in the 8.625 rear end's equipted with synthetic gear lube from factory. This is under normal conditions. So I will apoligise for makeing fun of Amsoil's claim of "life of vechile" drain interval for their new 2000 series gear lube. I figure if that type of drain interval can be aproved by an OEM then that is good enough for me!
Sandman
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Amsoil Series 2000 is latest introduction from Amsoil offering a higher level of performance vs. Amsoil's regular gear lube. They start with a different base stock with a special additives package. Amsoil could have discontinued the regular gear lube but contine to carry it due to its popularity.
I have Freightliner customers driving Class 8 Tractor Trailor Trucks using 75w-90 synthetic gear lube in their difs. Tuff enough for them ... Tuff enough for me.
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Additives ???
AMSOIL Slip-Lock Differential Additive
Effectively Eliminates Gear Housing Chatter
When making a turn, the outer wheels of a vehicle must travel faster than the inner wheels. It is up to the differential to act as a balance arm, establishing constant equilibrium of torques and forces between the left-hand and right-hand driven wheels. In standard (or open) differentials, power is directed to the wheel offering the least resistance. This works well when making a turn, but in a situation where one wheel is lifted off the ground, it causes the suspended wheel to turn while the other remains motionless.
Limited-slip (or positraction) and locking differentials are traction-increasing devices. Locking differentials transfer all available torque to both wheels. The teeth of the spider assembly engage with those on the locker clutch, causing both axle shafts to operate as one. Locking differentials don't allow one drive wheel to spin while the other remains stationary. Instead, they keep both wheels in drive mode, but unlock to permit different wheel speeds when turning. The engaging and disengaging of the teeth on automatic locking differentials often causes a banging and clunking sound. Manual locking differentials usually use an electric motor or vacuum diaphragm to engage the locker, reducing this noise.
Limited-slip differentials allow different wheel speeds when turning, but when one wheel loses traction, greater torque is transferred to the wheel offering more resistance. Limited-slip differentials make use of friction between clutch plates, as opposed to the meshing teeth employed by locking differentials. Transferring less torque per side, limited-slip differentials are generally smoother and quieter than locking differentials, but still sometimes "chatter" when transferring torque to the wheel with traction.
In some differential applications, a friction modifier additive is necessary to reduce chatter. AMSOIL Slip-Lock Differential Additive is formulated with advanced friction modifiers and is designed to eliminate gear-housing chatter in cars, trucks and SUVs equipped with limited-slip, positraction and locking differentials. It also reduces the banging and clunking associated with automatic locking differentials.
AMSOIL Slip-Lock Differential Additive is formulated for use with both synthetic and petroleum gear lubricants and safely replaces manufacturer recommended friction modifiers. Its convenient flip-top dispenser provides quick and easy application to the gear housing. One four-ounce bottle of Slip-Lock treats differential capacities of two to four quarts. It is not for use in automatic transmissions or other applications requiring ATF.
NOTE: AMSOIL Synthetic Gear Lubes DO NOT require the use of this additive. However, not all differentials respond the same and if chatter is noticed, the addition of AMSOIL Slip-Lock will eliminate it. For chattering differentials not running AMSOIL Gear Lube, this product is an excellent solution to the problem.
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DIY Helpful Information
For those of you thinking of changing your own fluids (DIY) ...
Helpful Differential Recommendations:
-Flush (drain) as much of the old fluid out.
-Differential fluid capacity depends on ring gear and axle housing size.
-Do not over/under fill differential. This could mean a capacity difference of a quart or more and may cause overheating problems. (See the owner’s manual for proper fill level)
AMSOIL gear oils are formulated with friction modifiers for limited slip differential applications. There is no need to add limited slip or additional additives.
-After changing the differential fluid, drive the vehicle in 7 or 8 figure eight turns, so the new lubricant can work its way into the axle assembly.
__________________________________________________
Synthetics provide the long-lasting protection, fuel efficiency and dependability needed for top performance, even extreme-pressure conditions. Synthetics stay fluid in cold temperatures for easy cold-weather shifting.
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Hope you found this to be helpful!
To request a FREE Amsoil Catalog, clink the link below.
Steven Roark , Amsoil Dealer , Proud Sponsor of www.DodgeDakotas.com
AMSOIL Synthetic Motor Oils, Lubricants, Filtration, and Truck Care Products
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BlkDakDave
GenIII
1/04/2004
10:55:00
| RE: Differential Gear Oil
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Message:
Prior to changing the rear differential fluid I was getting the clunk sound when turning either left or right while going up a slight grade, like turning into my driveway. With that, and having already using Amsoil in my tranny and crank I changed out the front and rear. As soon as the fluid was changed out I hit the parking lot and proceeded to do the figure eights and then drove the truck for a day hoping that the clunk sound would work itself out. It did not. So,I ordered the friction modifier and a few days later it was added to the rear. Back to the parking lot for more figure eights and the clunk was gone.
Having search a few threads, first trying to figure out what the heck that clunk sound was and then like you, trying to find out how much fluid to use, I found that not everyone needed the friction modifier. So you may not need to add it. Now if you ask me, I would tell you to go ahead and add it. It's not going to anything except save you a little bit of time in the long run.
NEVER FORGET!
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GO HERE
Dodge Dakota
JOIN HERE
1/04/2004
12:04:49
| RE: Differential Gear Oil
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Message:
Hey DrDakota try this;
http://www.dodgesrtclub.com/2001dodgeFMS/SERVIC~1.PDF
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DrDakota
Dodge Dakota
JOIN HERE
1/04/2004
12:35:50
| RE: Differential Gear Oil
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Message:
GO HERE- Thanks a bunch, you too BlkDakDave!
I used to frequent this site very often, but it filled up with trolls...I am very pleased to see that there are helpful Dak owners still out there! Keep up the good work guys! Thanks again!
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Lurkin
Dodge Dakota
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1/04/2004
13:20:47
| RE: Differential Gear Oil
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Message:
Dr, I just did this about a month ago.
The diffs take about 4 quarts of diff fluid for both. The front is just under 2 and the rear is just over if I remember. I used the Series 2000 gear lube without any LSD additive. Works fines for me.
The xfer case takes the ATF+4 fluid, or the AMSOil Universal fluid. Yes, about 1.5 qts will do.
Make sure that you have a fluid gun for the fills.
On the front diff, it's easier if you remove the splash guard to get to the top cover bolts. On the reassembly, it's easier to put the gasket sealant on the pumpkin, as you need to squeeze the cover up through a thin slot between the diff and the crossmember. The rear diff and xfer case are easy.
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DrDakota
Dodge Dakota
JOIN HERE
1/04/2004
23:03:45
| RE: Differential Gear Oil
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Message:
Thank Lurkin
Its those little tips like putting the gasket sealant on the pumpkin that really makes a job go easy!
You guys ever need any tips or pictures on putting in the HO cams and intake feel free to email me!
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