2006 3500 DRW 4X4 Diff Oil Question

[Boomer1]

Hello All



First of all what a great forum! Ok I have a 2006 Dodge 3500 DRW 4x4 5. 9L

373 gears and I'm ready to change diff oils in both front and rear. I have Mag-Hytech covers to install (AA14-11. 5 Rear; AA14-9. 5 Front) which I have already. Now I'm looking at Amsoil Severe Gear 75W-110 to buy. I need to know how much of this would I need with the new covers installed. Would I also need the anti slip additive? Has anybody used this oil and how does it perform? Any help with this would greatly be appreciated.



Thanks In Advance

Dan

 

[amsoilman]

Hello All



First of all what a great forum! Ok I have a 2006 Dodge 3500 DRW 4x4 5. 9L

373 gears and I'm ready to change diff oils in both front and rear. I have Mag-Hytech covers to install (AA14-11. 5 Rear; AA14-9. 5 Front) which I have already. Now I'm looking at Amsoil Severe Gear 75W-110 to buy. I need to know how much of this would I need with the new covers installed. Would I also need the anti slip additive? Has anybody used this oil and how does it perform? Any help with this would greatly be appreciated.



Thanks In Advance

Dan

Here is a link that will show all fluid amounts for your "stock" truck:



AMSOIL Products - Auto and Light Trucks Lookup - amsoiloaf. 323223710



The Mag-Hytech covers will add more capacity. Front will take 4 1/2 Qts. Rear will take 6 Qts.

 

[mberry]

I can't help with capacities, but I am using Amsoil just about everywhere in my truck. No problems, no complaints. No, you do not have to add anti-slip additive.

 

[Boomer1]

Thanks for info. amsoilman, much appreciated.



Dan

 

[Boomer1]

Thanks for the info. mberry



Dan

 

[Jim W]

I am running Amsoil 75W-90 Diff fluid in the rear axle with Mag-Hyteck diff cover. I installed this in early Feb of this year 09 at 15K on the truck. I used 8 Quarts, I also checked fuild level with the dipstick and this was spot on. You do not want to overfill the diff. This will cause foaming and overheating of the diff.

 

[CDonaldson]

I'm running the Severe Gear 75w140, hotter road temps here in the desert SW and I tow a lot of heavy loads. I bought a case of 12 quarts, did the job. You don't need any anti-slip additive. Good to go with the Amsoil.



CD

 

[AH64ID]

Here is a link that will show all fluid amounts for your "stock" truck:



AMSOIL Products - Auto and Light Trucks Lookup - amsoiloaf. 323223710



The Mag-Hytech covers will add more capacity. Front will take 4 1/2 Qts. Rear will take 6 Qts.

IIRC I put 8qts in the rear with the Mag-Hytec...







No LSD additive required, nor would it do any good. The LSD is helical gear driven, additives are for clutch packs.

 

[WoodChuck]

Amsoilman, what viscosity do you recommend? I've been running the SVG 75w-90.

How does this compare to the FGR gear lube?

 

[amsoilman]

Amsoilman, what viscosity do you recommend? I've been running the SVG 75w-90.



How does this compare to the FGR gear lube?

I would recommend the SVG-75W-90 for your application. It has been tested to the extreme.



Read here:https://www.amsoil.com/products/gearlubes/WhitePaper.aspx



The FGR is primarily for over the road trucks.



Wayne

 

[AH64ID]

I would recommend the SVG-75W-90 for your application. It has been tested to the extreme.



Read here:https://www.amsoil.com/products/gearlubes/WhitePaper.aspx



The FGR is primarily for over the road trucks.



Wayne

I agree. . if you tow 90% of the time you could probably go with the 75w-110. . But when I talked to AAM they said 75w-90 was more than plenty except maybe towing at GCWR thru death valley in summer...



The only time I would think 75w-140 would be needed on the AAM is if your over GCWR for 90% of the time.

 

[Boomer1]

Thanks guys for all your help! I'm going to go in the middle here and order a case of Severe Gear 75W-110 Amsoil. A lot of good people here and a lot of good advise. TDR is the best!

Thanks Again Guys

Dan

 

[AH64ID]

Thanks guys for all your help! I'm going to go in the middle here and order a case of Severe Gear 75W-110 Amsoil. A lot of good people here and a lot of good advise. TDR is the best!

Thanks Again Guys

Dan

I am not sure if I would run that in the front. Its not needed, and my be too much viscosity for freewheeling.

 

[Boomer1]

What would that hurt, doesn't it thicken only when it gets warmer AH64ID?

 

[AH64ID]

What would that hurt, doesn't it thicken only when it gets warmer AH64ID?

Yes, but the diff is always spinning, and gets warm. . but only has a load when your in 4wd.

 

[steved]

What would that hurt, doesn't it thicken only when it gets warmer AH64ID?

Oil does NOT thicken as it gets warmer... the first number is a flow characteristic in cold temps, the second number is the viscosity at operating temperature. The pinions in these trucks are flooded at normal fill; the only thing thicker oil might do is affect mileage at cold temps...



Foaming? Care to explain how running a differential overfilled will cause foaming more than at normal fill? Even at normal fill, the oil is still getting beaten and blended by the differential and gears... its not like your flooding something that isn't already flooded. Take a differential cover off and look at it if you don't believe me. And further, any reputable oil will have anti-foaming additives to prevent foaming.

 

[WoodChuck]

Amsoilman, my schedule B service interval with synthetic is 15k miles on the axles. This seems like way too much and my lube always looks as good as the day it went in (with the Mag Hytec cover). What would you recommend for a service interval with and without a MagHytec?

 

[AH64ID]

Amsoilman, my schedule B service interval with synthetic is 15k miles on the axles. This seems like way too much and my lube always looks as good as the day it went in (with the Mag Hytec cover). What would you recommend for a service interval with and without a MagHytec?

My dad and I both have Mag - Hytecs and both run Amsoil SVG 75w-90. . We both change our fluid at 50K miles, the minimum amsoil says its good for.

 

[WoodChuck]

I was just reading the "White Paper" and it states the the higher viscosity oils run hotter, you read that right. So no need to run anything more than the minimum required.

 

[steved]

I believe if you read the section the 15k is stated, that's "severe duty"... I think I remember there being no specified change interval for "normal duty"...



I have 80k on my 85w140 and it looks like I just put it in, but I also have 9qts of fluid with an aluminum cover. Having the added fluid and heat disappation of any aluminum cover is a significant benefit. I would not hesistate to run a minimum of 50k or more.