is ACDelco 10-4051 gear oil discontinued?

[Tnman54]

cant find it anywhere...what's the best alternative for '96 G80?....confusing

 

[df2x4]

Looks like it is discontinued... That sucks.

The specification is GL5 80W90 with no friction modifiers or additives, but unfortunately I'm not aware of any others that meet those specs off the top of my head. I'll look around...

Maybe this JEGS 28054? Looks like there's no limited slip additive in it, the only additive I see mentioned is an anti foaming agent.

https://www.jegs.com/i/JEGS/555/28054/10002/-1

 

[Vanishing Point]

How about this one! worked great for me, on my 1996 C2500 G80 Differential:
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Valvoline High Performance SAE 80W-90 Gear Oil 1 QT

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List Price:	$10.99 Details
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Style: Conventional
Size: 32 Fl Oz (Pack of 1)

• 1 GA
  
  
• 1 QT
  
  
• 1 QT, Case of 12
  
  
• 5 GA Pail
  
  
• 32 Fl Oz (Pack of 1)
  
  
• Configuration: 80W-90

• 80W-90
  
  
• 75W-90
  
  
• 85W-140

Brand	Valvoline
Package Information	Bottle
Liquid Volume	1 Quarts
Item Weight	0.01 Ounces
Viscosity	80W-90

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About this item​

• Protects Against Severe Temperatures To Help Extend Service Life
• Formulated With Extreme-Pressure Additives To Minimize Gear Wear From Shock Loads
• Helps Protect Against Gear Wear From Scuffing, Scouring, Corrosion And Pitting
• Recommended For Conventional Hypoid Differentials And Non-Synchronized Manual Transmissions In Passenger Cars, Light Trucks, Sport Utility Vehicles, Vans And Heavy-Duty Trucks Where An Api-Gl5 Or Gl-4 Fluid Is Specified

 

[Schurkey]

The specification is GL5 80W90 with no friction modifiers

That's actually kinda debateable. The GM bulletin was written by a high-schooler, it's vague and ambiguous. And--especially helpful--the recommended part number has been superseded at least once and maybe more, so that no one seems to know what the CURRENTLY recommended fluid is.

They tell you not to add "friction modifiers" but they do not specify whether the recommended gear lube has it blended-in by the manufacturer. Some sources claim that "of course it has some amount of friction modifier already blended-in, but don't add more."

https://bobistheoilguy.com/forums/threads/gm-synthetic-gear-lube.39655/#post-515982

OTOH, my 9.5" G80 quit working shortly after I changed the fluid to one with friction modifier blended-in already. I'm starting to think that the real problem is that it's worn-out, the fluid change and subsequent failure to work wasn't really the fault of the fluid, it's the fault of clutches that aren't as thick as they should be.

OTOH, the G80 is sorta working now, after two changes of fluid using the stuff below:

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[df2x4]

OTOH, my 9.5" G80 quit working shortly after I changed the fluid to one with friction modifier blended-in already.

I had the same issue with an 8.5" G80, and swapping the fluid to the ACDelco 10-4051 (no limited slip additive) brought it back first try. That's good enough for me.

EDIT - Regarding the superseded part numbers... It's been a long time since I looked into it but IIRC the original recommended oil from the TSB had no limited slip additive either.

 

[df2x4]

Directly from the TSB:

"Some light duty trucks equipped with locking rear axles (G80) may exhibit rear axle chatter, especially when turning a corner from a stop. This condition of alternate engagement and disengagement of clutches in differential assembly is usually caused by contaminated axle lubricant. To correct this condition, drain and refill the rear axle with SAE 80W-90 GL5 (P/N 10950849).

The use of any additive in locking rear axles (G80) is not recommended. Rear axle additives are designed for use in limited slip differentials which are normally installed in cars. All light duty trucks equipped with RPO G80 make use of a locking differential and the use of additives will delay the engagement of the locking mechanism and may decrease axle life."

Even if you think the additive part is debatable (IMO it seems pretty clear that they recommend against it) they definitely specifically call for GL5 80W90.

 

[Schurkey]

Define "ADDITIVE". (Is it an "additive" if the consumer is not the one who "adds" it to the gear lube? Or, in other words, is it an "additive" even if it's blended-in by the producer of the gear lube?)

Do they mean that there's ZERO friction modifier in the fluid as delivered to the consumer, or do they mean "don't put a bottle of friction-modifier additive in with the recommended fluid".

APPARENTLY, they mean "don't put a bottle of friction modifier additive into the fluid", because the supposed "expert" has claimed that there's some minimal amount of friction modifier blended-into the fluid already.

As I said...the bulletin is not real helpful because it's ambiguous and the part numbers are outdated.

"I" am using GL5 80W-90 fluid with zero friction modifier blended-in. But I'm not sure that's correct, it's just what works best for my worn-out G80.

The replacement clutch set for a G80 is about half the cost of an aftermarket TrueTrac differential. I have a hard time justifying replacing my clutches when I could get the entire friggin' differential new for about double.

 

[df2x4]

"I" am using GL5 80W-90 fluid with zero friction modifier blended-in. But I'm not sure that's correct, it's just what works best for my worn-out G80.

I am as well, and I'm fairly certain my G80s aren't worn out as they're both working as expected. That combined with reports from others here who have had similar experiences leads me to believe that this is the correct choice. GL5 80W90 with no additives or friction modifiers works, and stuff with them did not for me.

 

[fancyTBI]

Guess I’ll give the Valvoline a shot in my 14 bolt. I was looking for the AC Delco fluid a while back and everywhere said it was out of stock. Somewhere some dealership has a case of this laying around!

 

[Schurkey]

The 10-4051 specifically says it's not for use in trucks--cars only. Go figure.

www.amazon.com/ACDelco-10-4051-GL-5-80W-90-Axle/dp/B007Q10F3S

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MAYBE you want to look at 10-4016 "Grape Juice".
www.amazon.com/ACDelco-10-4016-75W-90-Synthetic-Axle/dp/B000QGOX1A/ref=sr_1_10?crid=39V4J1J22VMOT

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I'm thinking that the current version of the locking-differential gear lube is grape-scented. I may be wrong. Downsides to this stuff are that it's unreasonably expensive, and if your axle uses OEM RTV Silicone sealer, synthetic gear lube can cause deterioration of the Silicone. Aftermarket RTV Silicone may/may not be affected; and Permatex makes "special" RTV Silicone for use with gear lube.