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Replacing The Gear Oil


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Poll: What brand gear goil?

What brand gear oil do you like? And Why?

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#1 isutechman

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Posted 19 August 2009 - 08:51 PM

I'm going to replace the gear oil on my 04 with 60k miles. It has never been done before on this truck. Right now I'm leaning towards the Amsoil but wanted to see what you are all using and how you like it.

Thanks

#2 txab

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Posted 19 August 2009 - 09:02 PM

.

Edited by txab, 19 August 2009 - 09:03 PM.

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#3 Hammer2785

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Posted 19 August 2009 - 09:30 PM

I've used both Mobil 1 synthetic gear oil and Lucas Oil gear oil in both front and rear differentials.
2000 Z71 Off-Road SLT: 5.3L, 4L60E, 3.73 gears
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#4 Sir Dan

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Posted 19 August 2009 - 09:30 PM

Amsoil would be my first choice and Mobil 1 second. Both are very good and very easy to find at local stores, but Amsoil has proven to be a winner as far as I'm concerned. I started running it in my Harley after using their Screamin' Eagle full synthetic for years. Now the motor runs 20 degrees cooler and much smoother. That says alot for me!
2008 Sierra SLT ECSB Z71, Corsa Touring, and GMPP CAI
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#5 isutechman

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Posted 19 August 2009 - 09:47 PM

and how much do I need?

2004 2wd with the 3.42 10bolt.

#6 txab

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Posted 19 August 2009 - 10:21 PM

It'll take 2 qts. for sure and probably a little of a 3rd qt. I know on my '04 (3.73), 2 put it right at the correct level. YMMV though. If you end buying something local and you don't need the 3rd qt. you can always return it.

Edited by txab, 19 August 2009 - 10:22 PM.

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#7 C. Charles Hahn

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Posted 19 August 2009 - 11:26 PM

I used to run exclusively Mobil 1; this time around though I put Royal Purple in and I honestly think it does a better job than my M1 ever did.
2008 GMC Sierra CC SLT "All Terrain" Z71 4x4
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2009 GMC Envoy Denali 4WD
Quicksilver Metallic | Ebony Leather | 5.3L AFM V8 | 3.42 Locking Differential (G80)
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#8 spurshot

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Posted 20 August 2009 - 08:44 AM

I've never had any rear axle problems (or front on 4wd) using anything from Sta-Lube to Mobil 1. Frankly, I can't tell the difference. My El Camino had half a million miles on the stock rear axle and mostly Sta-Lube in it that was only changed a couple times and it had engines in excess of 400 hp in front of it. Sta-Lube has to be the cheapest stuff money can buy. I run Mobil 1 now, because it's in the stores.

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#9 rev353

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Posted 20 August 2009 - 08:52 AM

Now days I don't think it matters as much. I have good luck with Amsoil just like others have had good luck with other brands. I did check my mileage and driving before I changed all of my fluids to Amsoil, then switched and I still 13 months later have not noticed even a 1/2 mpg increase, thats what I was hoping for. The truck will make it to 300k on standard oil

#10 spurshot

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Posted 20 August 2009 - 09:00 AM

My experience with the El Camino was from about 1980 to 1998. Gear metallurgy in GM products hasn't changed much if any since then. Even if it did, what more could we ask for? The rear axle will probably outlast the truck, if it isn't damaged from abuse.

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#11 Bish

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Posted 20 August 2009 - 01:32 PM

Amsoil would be my first choice and Mobil 1 second. Both are very good and very easy to find at local stores, but Amsoil has proven to be a winner as far as I'm concerned. I started running it in my Harley after using their Screamin' Eagle full synthetic for years. Now the motor runs 20 degrees cooler and much smoother. That says alot for me!


+1 Amsoil first then Mobil1 for me.
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#12 redvett

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Posted 20 August 2009 - 02:33 PM

Here is a list of Capacities

2004 CHEVROLET TRUCKS 5.3L 8-cyl Engine Code [T]

CAPACITIES
Engine, with filter..........6.0 quarts[1]
Cooling System, W/ FR & RR AC Initial Fill..........16.0 quarts
Cooling System, W/ Front AC Initial Fill..........14.0 quarts
Automatic Transmission, 4L60-E Initial Fill..........5.0 quarts
Automatic Transmission, Total Fill
4 speed 4L60-E..........11.0 quarts
Differential, with 8.25 ring gear Front..........3.0 pints
Differential, with 9.25 ring gear Front..........3.2 pints
Differential, with 10.50 ring gear Rear..........5.5 pints
Differential, with 11.50 ring gear Rear..........7.6 pints
Differential, with 8.60 ring gear Rear..........4.2 pints
Differential, with 9.50 ring gear Rear..........5.5 pints
Transfer Case,NP8..........4.0 pints
Transfer Case,NR3/NR4..........3.0 pints
Transfer Case,NVG 246-NP8..........4.0 pints
Transfer Case,NVG 261-NP2..........4.0 pints
Transfer Case,NVG 263-NP1..........4.0 pints

#13 thearborbarber

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Posted 21 August 2009 - 01:38 AM

Amsoil Severe Gear oil is top shelf stuff.
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#14 C-Hawks

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Posted 21 August 2009 - 01:46 AM

How do you tell which gearing you have?

Here is a list of Capacities

2004 CHEVROLET TRUCKS 5.3L 8-cyl Engine Code [T]

CAPACITIES
Engine, with filter..........6.0 quarts[1]
Cooling System, W/ FR & RR AC Initial Fill..........16.0 quarts
Cooling System, W/ Front AC Initial Fill..........14.0 quarts
Automatic Transmission, 4L60-E Initial Fill..........5.0 quarts
Automatic Transmission, Total Fill
4 speed 4L60-E..........11.0 quarts
Differential, with 8.25 ring gear Front..........3.0 pints
Differential, with 9.25 ring gear Front..........3.2 pints
Differential, with 10.50 ring gear Rear..........5.5 pints
Differential, with 11.50 ring gear Rear..........7.6 pints
Differential, with 8.60 ring gear Rear..........4.2 pints
Differential, with 9.50 ring gear Rear..........5.5 pints
Transfer Case,NP8..........4.0 pints
Transfer Case,NR3/NR4..........3.0 pints
Transfer Case,NVG 246-NP8..........4.0 pints
Transfer Case,NVG 261-NP2..........4.0 pints
Transfer Case,NVG 263-NP1..........4.0 pints



#15 Irv

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Posted 21 August 2009 - 02:25 PM

Mobil-1 for me, never had good luck with Amsoil engine oil (consumption issues in truck, quad, sled) maybe not an apples to apples comparison but to be honest Amsoil makes me a little nervous :lol:




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