differential oil

[scippy]

I'm replacing the rear cover on my Dana 80.... what type of oil & weight would be the best to use for the oil change?.........thanks Scippy

 

[jlbayes]

It will depend on if it has a limited slip or not.

 

[scippy]

It will depend on if it has a limited slip or not.

How do I know for sure....glove compartment sticker has info says, Dif. 80M

 

[SportRam00]

You could check the factory service manual. There is a link somewhere around here to download it. When I serviced my Chrysler 9.25" diff, I used Valvoline 75w-140 Synthetic with some Trans-X Friction Modifier. That's what the FSM recommended for heavy hauling. For "normal" use it calls for 80w-90 I believe....

Those are both recommended weights for the 9.25" axle. A D80 may be different.

 

[jlbayes]

How do I know for sure....glove compartment sticker has info says, Dif. 80M

Check the axle tag or run the vin.

 

[scippy]

gave the last 8 of my vin to dodge and they said my truck has "anti slip differential".....what type of oil should I fill her with?

 

[scippy]

gave the last 8 of my vin to dodge and they said my truck has "anti slip differential".....what type of oil should I fill her with?

Amsoil severe gear 75w90 ????

 

[Gr8bawana]

If you decide to use it make sure you ad a friction modifier or the rear-end will chirp when making a turn.

 

[Nathan Haslag]

Ya it needs to have a modifier for the limited slip

 

[scippy]

Thanks guys!.........So, with the Amsoil severe gear (75w90) .........I just ordered Archoil 9100 friction modifier and mopar limited slip additive.

 

[dodge dude94]

Friction modifier and LS additive are the same thing. You can use one or the other.

Surprised the Amsoil doesn't already have friction modifier in it. I know a lot of synthetics have it because it's easier to just skip a step. Keeps people from jacking up their stuff and then suing the manufacturer.

 

[S0CAL]

given the opportunity, you could go with Redline as it has friction modifier in it, no need for MOPAR Unicorn tears.

 

[scippy]

Thanks!!.........So now how many quarts of gear oil for my 2001 dodge ram diesel dually with the Dana 80?

 

[S0CAL]

Thanks!!.........So now how many quarts of gear oil for my 2001 dodge ram diesel dually with the Dana 80?

It differs on 2WD and 4WD. See this link, look towards bottom of page for Dana 80. Others on the forum may know definitively.

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

 

[scippy]

The chart states it very clear thanks SOCAL!........Now since I already ordered friction modifier to use in conjunction with gear oil.,
I won't be using Amsoil severe gear oil with friction mod already added .......I'll buy oil without and just add my own.
I have a Question about the weight of gear oil to be used, the truck will be used less than 3k miles a year & within that year I'll be
towing my boat (which is 14k lbs. boat & trailer) approx. 3 times a year totaling 1K miles. The grade will be slight incline, but not
mountainous .........should I still use recommended 75w90 oil?

 

[S0CAL]

Yessir, stay at the recommended. Good luck!

 

[scippy]

Any body use Royal purple max gear oil in their rear differential ?

 

[jlbayes]

We use the 75w-140 as it is already in the shop for trucks and throw in the modifier. Do not use 80w-90 in it whatever you do. It will act like a locker.

 

[Stefan N]

Do not use 80w-90 in it whatever you do. It will act like a locker.

How can it do that?

 

[jlbayes]

How can it do that?

The oil is too thick and will not let the clutches do their thing. Slip on turns.