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Rear differential capacity... sorry, I don't have a repair manual!

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Hello... . I have a 2004. 5 Ram 2500 Limited Slip differential 4x2. 3. 73 Gears. What is the fluid capacity for the rear differential?? I was told 4 quarts by one dealer and 2. 5 quarts by a 2nd dealer and 3 quarts by a 3rd dealer! Maybe thats why most of us had them low on fluid from the very beginning. I do know there is a full line on my diff, But need to order the fluid and want to make sure I have enough... Can someone tell me how much it will take to be at the proper level???? I am switching to the AMSOIL 75-140 because I tow quite frequently, and sometimes in high heat areas... Is this a good choice?? Please respond as soon as you can. Thanks! :) :)



OH, After talking to all three dealers, one of them said I needed the LS additive, the other said I did not. I spoke to AMSOIL and they said I did NOT need the LS additive, as it was already incorporated into the formula... . what is your take on this???
 
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OK, my dealer told me ( Actually 2 dealers told me) that my truck needed the 75-140 because I use thr truck for pulling . Thats what I ordered. Is their really a big difference between the 90 and the 140????
 
The difference is 50. ;)



Dodge recommended 75W-140 in the 2nd gen axles for heavy towing. It seems that a lot of dealers don't keep up on the requirements for the new trucks. As stated before, the AA diffs do not require additive, and 75W-90 is the recommended fluid for all services. Personally, I plan to use 75W-90 Amsoil when it's time to change.
 
Gears is gears! ;)



And UNLESS there is a dern good reason to NOT use the heavier weight lube for towing, *I* sure would - I seriously doubt the AA's are made of any better stuff or machined/treated better than the gears in the Dana... I use 85/140 Valvoline synthetic blend in mine for better protection towing while still allowing proper LS function. As this is being written, My RVing buds '99 Ford Super Duty is sitting out in my driveway with a shot Dana 80 - he tows a heavy 33 foot 5er, and is still using the 90 wt in the diiferential like it came with - differential SHOT at 70K miles...



Gears is gears... ;) :D
 
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75w140 is NOT listed to use!Enough said for me. Gear facing and bearing hardness. maching etc. is NOT the same for all gears. There must be a reason 75w140 is not called for.
 
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One reason makers recommend use of lighter lubes is not related to wear issues, but fuel mileage. Thus, the switch to automatic transmission fluids in some manual trannies, and lighter weight motor oils. You see, the manufacturers aren't as interested in longevity of parts, as long as they manage to last beyond warranty, but ARE very interested in keeping their CAFE numbers as high as possible to sell more of their vehicles...



*I*, on the other hand, am FAR more interested in keeping my truck for the long-haul, and am more than willing to lose . 2 MPG in order to allow my differential and transmission to last as long as the Cummins... ;)
 
Originally posted by Gary - KJ6Q

One reason makers recommend use of lighter lubes is not related to wear issues, but fuel mileage. Thus, the switch to automatic transmission fluids in some manual trannies, and lighter weight motor oils. You see, the manufacturers aren't as interested in longevity of parts, as long as they manage to last beyond warranty, but ARE very interested in keeping their CAFE numbers as high as possible to sell more of their vehicles...



*I*, on the other hand, am FAR more interested in keeping my truck for the long-haul, and am more than willing to lose . 2 MPG in order to allow my differential and transmission to last as long as the Cummins... ;)





Good point Gary. We are not talking clutches or valves, just gears. Using a very high quality synthetic oil is probably the most important issue here. I suppose if American Axle is using particularly tight clearances there could be a reason for specifying the ligher fluid. However, our axles howl like differentials did in the good 'ol days so I suspect that using a higher viscocity is not going to hurt anything. On the other hand I'm not convinced it's better either.
 
Note that the AA requires synthetic, where the Dana did not. I suspect that synthetic 75W-90 may outperform dino 75W-140.
 
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