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Gear oil for heavy hauling #2542129 02/19/12 08:15 PM
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ib516 Offline OP
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I have the 2007 Megacab in my sig. I have added some power to it, about 100hp, and it tows a 36.5' fifth wheel RV. I have noticed that at the end of every towing season, the paint on the rear diff cover seems to have flaked off the area where the ring gear slings oil at it. I have a PPE finned aluminium diff cover to install (that adds 2 quarts oil capacity). Here's a picture of one like it I grabbed off the www.


I have changed the gear oil every year, and always use the recommended 75w90 synthetic GL5 gear oil in the diff. Last time I think it was Catrol brand.

Anyway, before I take the old cover off and put the new one on, I obviously want to have the new oil ready, and I'll need 6 quarts give or take.

Looking for recommendations as to what brand to use, and what viscosity.
Some points to consider:
- The manual calls for 75w90.
- I tow 2 months a year
- I live in Canada, it gets cold here (-40*)
- truck is used as a daily commuter the other 10 months of the year

I have been considering Amsoil 75w110 as a nice comprimise between the 90 and 140. A little heavier oil when hot for better protection, but not the 140 weight. I don't want 75w140 due to cold weather performance.

75w90, 75w110, or 75w140...brand? -- Thoughts?

Last edited by ib516; 02/19/12 08:17 PM.

2007 RAM Megacab 3500 SRW 4x4, 5.9L CTD: 15w40(sum)/Co-op DMo Gold SL 0w40(wtr)
2006 Pontiac Montana SV6: High Mileage 5w30(sum)/BG HiLo Syn 0w30(wtr)
Re: Gear oil for heavy hauling [Re: ib516] #2542147 02/19/12 08:28 PM
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ls1mike Offline
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This is th 11.5 AAM rearend used in both GM and Dodge trucks or at least it should be. They are good unit. I have not really heard of any failures even with the 75w90 used. I would think you should be fine with the 75w110. Do you thing it getting that hot, I mean hot enough to flake the paint?


Mike
00 Trans Am WS6 5.7 LS1
17 Silverado 3500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT
Re: Gear oil for heavy hauling [Re: ib516] #2542170 02/19/12 08:37 PM
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ib516 Offline OP
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Yes I think it is getting hot. Truck & RV combined weight is about 21,000#, and I usually head to the mountains.

And yes it is the AAM 11.5" (3.73s).

Last edited by ib516; 02/19/12 08:38 PM.

2007 RAM Megacab 3500 SRW 4x4, 5.9L CTD: 15w40(sum)/Co-op DMo Gold SL 0w40(wtr)
2006 Pontiac Montana SV6: High Mileage 5w30(sum)/BG HiLo Syn 0w30(wtr)
Re: Gear oil for heavy hauling [Re: ib516] #2542173 02/19/12 08:38 PM
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dparm Offline
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Motul Gear 300 is a nice 75w90 with an extraordinarily high 222 viscosity index. It's billed as being for both race and street. GL-4 and GL-5 rated.


2017 Chevrolet Corvette Grand Sport
Re: Gear oil for heavy hauling [Re: ib516] #2542181 02/19/12 08:43 PM
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deeter16317 Offline
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That is a common sight on the Dodge AAM...peeling paint.

The only thing I will say is research your brand...if you have an LSD. While they specifically tell you they don't require LSD additive, some people experience clutch chatter with certain brands of gear oil; which requires a few bottles of LSD additive to correct.

Re: Gear oil for heavy hauling [Re: ib516] #2542186 02/19/12 08:47 PM
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ls1mike Offline
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The additive is good stuff, in general I think it is pretty good for and LSD. GM tell you to use the stuff at least in my Trans am. Now I am not sure about the electric locking rear diff.
Does the Dodge have this?


Mike
00 Trans Am WS6 5.7 LS1
17 Silverado 3500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT
Re: Gear oil for heavy hauling [Re: ib516] #2542194 02/19/12 08:50 PM
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tomcat27 Offline
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personally I'd use Amsoil Severe Gear....
I've used Amsoil normal gear lube in mine for years
- granted I only have approx 13,000 lbs that I pull combined


2019 Cherokee, 2018 Jetta, 2014 Sentra, 2001 Camry, 1995 Escort, 1970 Cougar, 2013 XT250, 2010 Vstar, 2014 CTX1300
Re: Gear oil for heavy hauling [Re: ib516] #2542197 02/19/12 08:51 PM
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Originally Posted By: ib516
I have been considering Amsoil 75w110 as a nice compromise between the 90 and 140. A little heavier oil when hot for better protection, but not the 140 weight. I don't want 75w140 due to cold weather performance.

The Amsoil Severe Gear in 75W-110 should serve you well.


2019 o)|||||(o Rubicon Wrangler Unlimited 3.6L V6 [Castrol Edge + Ultra]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum + Mann filter]
Re: Gear oil for heavy hauling [Re: ls1mike] #2542206 02/19/12 08:57 PM
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ib516 Offline OP
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Originally Posted By: ls1mike
The additive is good stuff, in general I think it is pretty good for and LSD. GM tell you to use the stuff at least in my Trans am. Now I am not sure about the electric locking rear diff.
Does the Dodge have this?

It is a limited slip, but doesn't require any additive as it has no clutches.


2007 RAM Megacab 3500 SRW 4x4, 5.9L CTD: 15w40(sum)/Co-op DMo Gold SL 0w40(wtr)
2006 Pontiac Montana SV6: High Mileage 5w30(sum)/BG HiLo Syn 0w30(wtr)
Re: Gear oil for heavy hauling [Re: ib516] #2542230 02/19/12 09:14 PM
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JosephHarmon Offline
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That doesn't look that heavy.

Re: Gear oil for heavy hauling [Re: JosephHarmon] #2542241 02/19/12 09:24 PM
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ib516 Offline OP
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Originally Posted By: JosephHarmon
That doesn't look that heavy.


What are you talking about?


2007 RAM Megacab 3500 SRW 4x4, 5.9L CTD: 15w40(sum)/Co-op DMo Gold SL 0w40(wtr)
2006 Pontiac Montana SV6: High Mileage 5w30(sum)/BG HiLo Syn 0w30(wtr)
Re: Gear oil for heavy hauling [Re: ib516] #2542242 02/19/12 09:24 PM
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DrDusty86 Offline
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Wecome ib,
This crowd is a lot friendlier than trailerlife..many helpful folks here..it wont turn into a trollinng bash fest either.
Dusty

Re: Gear oil for heavy hauling [Re: ib516] #2542250 02/19/12 09:35 PM
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chubbs1 Offline
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Another vote for Amsoil Severe Gear 75w110. Arguably the best product Amsoil makes.


'12 Charger SXT
QSUD 5w30 OEM filter

'12 Charger SXT
Edge FST EP 5w30 OEM (Mine;)

'11 Hyundai Sonata GLS
QSUD 5w20 OEM Filter

Re: Gear oil for heavy hauling [Re: ib516] #2542498 02/20/12 07:48 AM
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deeter16317 Offline
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Originally Posted By: ib516
Originally Posted By: ls1mike
The additive is good stuff, in general I think it is pretty good for and LSD. GM tell you to use the stuff at least in my Trans am. Now I am not sure about the electric locking rear diff.
Does the Dodge have this?

It is a limited slip, but doesn't require any additive as it has no clutches.




While the Dodge spec says it doesn't need LSD additive, that Trac-Rite LSD indeed has clutches. They are termed "shoes" in the IPL and the Trac-Rite will indeed experience LSD clutch chatter.

I have one too (with almost 270k miles on it), trust me; they will get chatter with different fluids.

Re: Gear oil for heavy hauling [Re: ib516] #2543430 02/21/12 12:33 AM
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MetalSlug Offline
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I do use redline on rear diff, i know few guy towing some serious heavy towing, they all running redline gear oil. any car truck i own that using rear wheel drive, my choice alway redline gear oil. It never let me down.

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