ok so i have an 07 2500 hemi, and am looking to change the rear diff fluid to amsoil, but i have some questions/ missing information

first off its an aam rear end with 14 bolt pattern, the bolts all say AA 10.9 thats all i could find on the diff. question is what weight of fluid do i need? from what i've checked online its 75w 90.

next i believe the owners manual says friction modifer is not required, i have some, but do i need to put it in? if its not needed and it is installed will it ruin anything?

lastly what do i tourque the cover bolts to when i reinstall the the cover?

any help would be greatly appreciated.

 

I used 75 140 in my rear and 75 90 in the front... IMO its better to have the thicker fluid in the rear, it keeps things cooler. If you already have friction modifier go ahead and dump it in, it wont hurt anything if you dont have an LSD, and if you do have an LSD then you're covered. If you are familiar with rear ends you will know if you have an LSD when you open it up...
Not sure on the torque, I just got mine snug, then let the RTV dry, then cranked them down evenly..

 

If you have limited slip, you need the friction modifier for the clutches.
It will not hurt anything if you install it in an open differential.
The owners manual will tell you the recommended weight.
I believe it is a 10.5 with the hemi and 11.5" with the Cummins.

 

i could not find the weight in the owners manual anywhere, i'll look again. but i'm certain its not in there. its a canadian truck but i can't see the owners manuals being different, i'll check again in the morning, thanks for the posts

 

I do parts at a chrysler dealership in northern canada and for year around service we use 75w90 ( the mopar stuff) in all the trucks. Granted, for HD use or hot climates 75w140 would deff be preferable.
For those wondering what rear axles in which trucks...
1500- 9.25 chrysler
2500- 10.5 AAM
3500- 11.5 AAM

If you do not add the friction modifier to your LSD it will not last long. I suspect a quick lube place made that mistake before i bought my truck cuz mine is toast lol

 

Here you go jayjma.

Taken from the Dodge maintenance manual.

FRONT AXLE C205F - Mopart Gear Lubricant 75W-90
9 1/4 AA - Mopart Synthetic Gear Lubricant 75W-90

REAR AXLE 9 1/4 - Mopart Synthetic Gear Lubricant 75W-140

10 1/2 AA - Mopart Synthetic Gear Lubricant 75W-90

11 1/2 AA - Mopart Synthetic Gear Lubricant 75W-90

Capacities FRONT AXLE ± .03 L (1 oz)

C205F 1.66 L (3.5 pts.)

9 1/4 AA 2.25 L (4.75 pts.)

REAR AXLE ± .03 L (1 oz)

9 1/4 2.32 L (4.9 pts.)*** *** With Trac-Lok add 118 ml (4 oz.) of Limited Slip Additive.

10 1/2 AA 2.25 L (4.75 pts.)

11 1/2 AA 3.62 L (7.65 pts)

Hope this helps?
Al.

 

75w-90, both axles, fill to 3/4" BELLOW fill plug, NO FRICTION MODIFIERS!.

If you overfill, the seals will start leaking.

Clean the flanges with brake cleaner, seal with RTV, then tighten down to a snugged bolt in an even tightening pattern, allow RTV to set up for an hour, fill.

A syringe (looks like a grease gun but has a hose connection where the grease pump head would be) makes filling these extremely easy.

Done it several times already---Just follow the FSM!!
Doing the right maintenance--the right way--means reliability.

NO FRICTION MODIFIERS IN 3/4 TON DIFFERENTIALS FOR DODGE!!!!!!!

 

+1 on the "overfill" as Gone stated.
Plus, the the oil starts to foam and overheating results.
Read here, cooked internals due to oil break down.
Al.

 

thanks for the posts, i'll try to get it done today, maybe with some pics. still would like to know the bolt torque. i bought the blue rtv sealant the guy at the parts shop said thats sufficent, just need a little clarification so i get both surfaces clean apply the rtv to the cover, stick the cover on and just start by finger tightening the bolts? or just torque them down right away?

 

bear found this its great

http://dodgeram.info/tech/BRSpecs/fluids/specs.html