That’s it, I’m confused! Gear oil

[DarthMegaHD]

trust me, I’ve been searching the forums so please don’t tell me about using the search to find a post you saw one time. So it’s clear the favorite gear oils are amsoil severe gear and redline. Got it. Hard to find locally but I’ll order. But the weights? I have 4.10s in my 2500 and the manual recommends 75w95 but it seems most recommend 75w140 for the rear? Why would you want a different weight for the rear when they’re the same ratio? Even if the answer is “because science” that’s fine, I just don’t want to buy the wrong weight. Also, last thing. It seems the amount of oil differs quite a bit. I know there’s a fill line on the back plate. The amount to this line I’ve gathered is anywhere between 2.5 and 5 quarts for the rear. If both front and rear were to take the same weight it could save some headache and I’d just buy 3 gallons or something but that’s not the case. Many on here recommend different weights. Someone please spell this out very clearly for me, I’m a Marine I need very clear instructions lol. I’ve watched the YouTube videos and they vary or leave details out.

I’m leaning towards 3 quarts of redline 75w95 for the front and 4 quarts of redline 75w140 for the rear. If anyone thinks I’m dead wrong or need this or that tweak, by all means please let me know, thanks

 

[madtrucker2016]

Yeah you are correct to put only the correct weight oil in the rear,because if that puppy goes it,s going to break the bank. I really don't know the weight and amount I have 392 gears in rear, so I have to look up my oil too. Good luck.

 

[dexter]

I have the same gears.
The manual I have says:
Front and Rear Axle – 2500/3500 Models
We recommend you use SAE 75W-90 HD Ram GL-5 Synthetic Axle Lubricant. Limited slip additive is not required for Limited-Slip Rear Axles.

THere is a lot of mis information on the net.

Change your fluid at recommended intervals and you will be fine.
I tow a lot and use the 90.

 

[Ionicbrick]

I have the same gears.
The manual I have says:
Front and Rear Axle – 2500/3500 Models
We recommend you use SAE 75W-90 HD Ram GL-5 Synthetic Axle Lubricant. Limited slip additive is not required for Limited-Slip Rear Axles.

THere is a lot of mis information on the net.

Change your fluid at recommended intervals and you will be fine.
I tow a lot and use the 90.

Same here. I put 75w90 in mine and tow a lot too.


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[SeppW]

My manual specifies Synthetic, GL-5 SAE, 75W-90 for front and rear with no friction modifier.

 

[DarthMegaHD]

So how many quarts do I need for front and back?

 

[dexter]

So how many quarts do I need for front and back?

Do you us to change it for you also?

Check your manual.

 

[G. Mcpherson]

7 qts. The owner's manual gives you capacity.

 

[DarthMegaHD]

7 qts. The owner's manual gives you capacity.

Thanks for the help, gmac. I appreciate you

 

[ALRedneck]

Go over to the Power Wagon forum. Scroll down about 25 threads and there is a long, detailed discussion with pics.

 

[68PowerWagon]

I think some guys go with a heavier weight in the rear cause it takes on much more pressure & heat. Just like engine oil now days, they (manufacturers) try to keep the weight as low as possible for mileage & emissions. I tow heavy so I might go a little thicker than the 75/90

 

[62Blazer]

This is another one of those topics where there is a lot of BS floating around. People put way too much thought into gear oil and a lot of information floating around is pure speculation and theories coming from people who have zero scientific knowledge about it. My first comment.....quit second guessing the manufacturers recommendations. I was involved in automotive testing for a long time and can tell you that both the auto manufacturer and the axle manufacture spend a LOT of time and money verifying that items like gear oil are correct. With that said comes my second comment......the difference between something like 75w-90 and 75w-140 really isn't going to make a difference. Multi-viscosity ratings are basically just recommended operating temperature ranges (both ambient temperature and how hard you are running it). Basically the 90 vs. 140 is just saying that if you are running it really hard in really hot temps the 140 will handle that a little better. But I will also say that if the manufacturer states that 75w-90 is fine they have already tried running it really hard it really hot temps and determined it was good enough. Kinda' like being a crappy golfer...you can go buy the most expensive golf clubs out there but you are still going to be a crappy golfer........

 

[Ionicbrick]

Go with manufacturers specs. They’ve tested everything thoroughly. You want to make sure that you don’t use oil so that that it doesn’t properly lube the pinion bearings by cast off from the ring gear.



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[Ratket]

You should order a Banks diff cover while your at it. That would really sweeten the deal.

 

[DarthMegaHD]

Go with manufacturers specs. They’ve tested everything thoroughly. You want to make sure that you don’t use oil so that that it doesn’t properly lube the pinion bearings by cast off from the ring gear.



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I actually posted that exact video elsewhere after someone recommended a flat plate aftermarket cover. Banks did the science and discovered flat doesn't work. I would love to go for one of those Banks but I'm on a budget.

 

[chri5k]

The obligatory gear lube test report. Not exactly light reading but well written.

http://www.syntheticwarehouse.com/brochures/g2457_gearlube_study.pdf

 

[DarthMegaHD]

The obligatory gear lube test report. Not exactly light reading but well written.

http://www.syntheticwarehouse.com/brochures/g2457_gearlube_study.pdf

Cool, maybe I'll go with amsoil next time but I already ordered Red line today

 

[68PowerWagon]

The obligatory gear lube test report. Not exactly light reading but well written.

http://www.syntheticwarehouse.com/brochures/g2457_gearlube_study.pdf

Great! The shop that did my gear swap used Royal Purple! I just completed my last break in procedure this past weekend. I was going to wait awhile longer to change the oil to Amsoil Severe Gear. I think I might just do that sooner than later.

 

[Hemi395]

Those Easy Packs from Amsoil are hard to beat. Plus Severe Gear is a damn good gear oil....

 

[chri5k]

I actually posted that exact video elsewhere after someone recommended a flat plate aftermarket cover. Banks did the science and discovered flat doesn't work. I would love to go for one of those Banks but I'm on a budget.

The Banks diff cover for my 2106 2500 will be here today. Won't get a chance to install it before I leave for a weekend trip. Will report back once I install it.

On thing that cracks me up from the so called "expert' reviews of the diff cover is they keep saying it hangs lower that the OEM or other aftermarket covers. No it does not. The bottom edge of the Banks cover is even with the bottom edge of the diff same as stock. The bottom edge of the Banks cover is wider than the stock cover to form the air scoops for cooling but it does not hang down any lower. Also, the scoops are relieved and will break off before the cover breaks. Banks said in his video that if that happens, he will give you a new diff cover free.