2nd Gen Non-Engine/Transmission Differential fluid capacity?

[SteveAnsley]

Another differential fluid question.



Going to changing the fluids in my Dana 80 (LS) and NV4500. Plan on using Redline. ('98 12 valve'r)

75w90 (w/ friction modifier) in the rear and 50/50 of MT-90 & MTL the transmission.



Question: How much fluid for the differential?

The Haynes book list the Dana 80 between 6. 8 and 10. 1 pints.



I plan on jacking each side of the axle up while the cover is off in order to drain as much old oil as possible. How much lube should I expect to use?

 

[ata]

D-80 2 wheel drive 6. 8 pts plus 0. 25 friction modifier. D-80 4 wheel drive 10. 1 pts plus 0. 4 friction modifier. NV4500 6. 5 pts.

 

[SteveAnsley]

Thanks.

I didn't realize the 2wd and 4wd D-80 axles had different capacities.

 

[TMitch]

I just changed my NV4500 fluid witht 50/50 MTL/MT90 and I bought 2 quarts of each and had a bit left over when I was done, I think the FSM said 3. 8 quarts. I'm going to do the diffs next.

 

[TBontrager]

I have almost 100K miles and just noticed that I don't have a maintenance interval to change differential oil? What is the recommended maintenance interval?

 

[ox1]

I just put a gallon of opil in the rear (80) on my 4wd. That brought it almost to the bottom of the plug. Close enough for me.





Someone explain to me how there is a difference in capacity between 2 and 4wd on an 80.



You sure it isn't the diff between an 80 and an American Axle?

 

[Gary - K7GLD]

I just drained and refilled the Dana 80 in my '02 a couple of days ago, got just a bit over 3 quarts before lube started spilling outta the fill plug - this was on a level garage floor...

 

[ox1]

Doesn't your 3/4 have a 70 in it?

 

[ata]

Someone explain to me how there is a difference in capacity between 2 and 4wd on an 80.



The only thing I can think of would the size of the rear cover. I just Quoted what was in the Dodge service manual.

 

[ox1]

I put 4 qrts in mine - and it IS a 4wd - but the cover doesn't look like it could be any smaller and still clear the ring gear. I aint gett'n an extra qrt in the cover - that's for sure.



The thought of Dana puting more fluid capacity in the same diff b/c it was getting some help from the front just makes no sence to me.



HAS to be a different axle or maybe the one version doesn't have oil bath wheel bearings? (If that's even a possability?)



----



BTW - the friction modifier is only for diff's equiped with limited slip. Mine is open.

 

[Gary - K7GLD]

I would expect that LSD differentials, as compared to non-LSD types, would hold less lubricant due to additional internal hardware, unless housing changes made up for that difference.

 

[Kirwin]

Dana 70 vs Dana 80

Auto equipped 2WD 2500s have Dana 70s from the factory. All 2nd gen 4WD trucks have Dana 80s from the factory. Ken Irwin

 

[Gary - K7GLD]

Auto equipped 2WD 2500s have Dana 70s from the factory. All 2nd gen 4WD trucks have Dana 80s from the factory. Ken Irwin

OR, to put it another way as I understand it, ONLY the automatic transmission equipped 2WD 2nd gennies had Dana 70's, all others have 80's...

 

[ox1]

Does that mean that as long as it doesn't have an auto in a 3/4 that is is an 80? LOL!





Anyway - how aboot Dana 80 HD? I believe that they actually have the HD - at least in mine. Are all the 80's in them the HD's? If the 70 is OK in a 3/4 ton auto - then it would seem that in some cases that the standard 80 was acceptable?



I have absolutely no idear what the diff between a st and an HD would be - but that could be you qrt of url right there. ???

 

[PatrickCampbell]

Guys, the 4x4 diff or diff cover (not sure I have a 2wd) has some sort of resevoir.



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

 

[DAWG-1]

Capacity

There is a Dana 80 single rear wheel and a Dana 80 dual rear wheel. The difference is the length of the axle tubes, a 1 ton dually has shorter axle tubes = less fluid . Sam

 

[PatrickCampbell]

Dawg, the 4x4 versus 4x2 is advertised as holding more, not the single rear wheel vs dually.

 

[RDelissen]

Auto equipped 2WD 2500s have Dana 70s from the factory. All 2nd gen 4WD trucks have Dana 80s from the factory. Ken Irwin

not exactly ... mine is a 96 4wd auto with a Dana70 in the back

 

[PatrickCampbell]

GUYS, please now. HO's get the Dana80.