2nd Gen Non-Engine/Transmission amsoil in the differentials

[Wyomingcowboy]

Sorry if it seems as if this is being beaten to death guys, but what would be the best amsoil to run in my diff's? I have the Dana 80 in the rear, and I assume the 60 up front. I was thinking of going with the 80W-90 in both because it's a tad cheaper/qt. I do not tow regularly, but it tends to get heavy when I do. Alot of hwy crusing and around town stuff as it's (going to be) my daily driver.

Thoughts... ... ... ... . ?



TIA!

 

[GOlsen]

80W-90 is good for both.

 

[fest3er]

It's been suggested that 75W110 Severe Gear is the minimum one should consider using in a diesel P/U's differentials. 75W90 and 80W90 were spec'ed decades ago for the common loads and power levels back then. The specs haven't changed since, but the loading sure has increased a lot.

I've been using the 75W90 and 80W90 in my diffs for 11 years & 260K miles. They haven't fallen apart, but they sure do get loud in sub-zero temps. Were I to start over again, I'd've used a heavier lube in the differentials.

I would suggest using 75W110 Severe Gear at a minimum. If you haul very heavy loads long enough for the diffs to get to full hot temp, even on an irregular basis, I would suggest using 75W140 Severe Gear. For the little extra you'll pay for the Severe Gear lube, you'll be getting a lot of extra wear protection. The pour point of both -110 and -140 Severe Gear is -48F; both will flow fairly well at the normal cold temps you see in WY.

Finally, my usual caveat. Only you can decide which lube to use. We dealers and lubrication experts can only try to give you the information you need to make the wisest decision.

 

[Wyomingcowboy]

It's been suggested that 75W110 Severe Gear is the minimum one should consider using in a diesel P/U's differentials. 75W90 and 80W90 were spec'ed decades ago for the common loads and power levels back then. The specs haven't changed since, but the loading sure has increased a lot.



I've been using the 75W90 and 80W90 in my diffs for 11 years & 260K miles. They haven't fallen apart, but they sure do get loud in sub-zero temps. Were I to start over again, I'd've used a heavier lube in the differentials.



I would suggest using 75W110 Severe Gear at a minimum. If you haul very heavy loads long enough for the diffs to get to full hot temp, even on an irregular basis, I would suggest using 75W140 Severe Gear. For the little extra you'll pay for the Severe Gear lube, you'll be getting a lot of extra wear protection. The pour point of both -110 and -140 Severe Gear is -48F; both will flow fairly well at the normal cold temps you see in WY.



Finally, my usual caveat. Only you can decide which lube to use. We dealers and lubrication experts can only try to give you the information you need to make the wisest decision.

Wouldn't the heavier lube be louder at colder temps - theoretically?

 

[amsoilman]

Lok at the last page of this document:



White Paper - A Study of Automotive Gear Lubes

 

[georgej]

I use Amsoil 75-140w synthetic as per dodges '01 specification. I tow about 50% of the miles on my truck which has 124700mi on it. YMMV

 

[CumminsPower98]

I ran the 75w140 Severe Gear the whole time I was driving OTR with about 45% towing. It worked well for me. I ran 100k mile change intervals. Now that the truck just sits and isn't towing much I have put the 75w90 back in for a little less drag running empty. I sure did notice the drag until warm from the heavy stuff in the sub-zero weather up north.

 

[Grumpy John 4x4]

diff oil

I use servere gear Amsoil 75-140 works for me!

 

[Midnite]

Up here in Alaska I went with the Amsoil lighter weight lube to help handle the cold weather a little easier. Towing hasn't been a problem either, but I've only towed as heavy as a 10000# boat+trailer.

Mike

 

[CochranD]

amsoil

I run Amsoils light weight stuff, I forget the number. Dont forget the sliplock. I didnt put it in right away till I noticed a shutter when pulling 4 horses in my gooseneck trailer.