New Mag Hi-Tech Rear Cover Question - Chevy and GMC Duramax Diesel Forum

2011+ LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
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post #1 of 9 (permalink) Old 04-01-2012, 04:59 AM Thread Starter
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New Mag Hi-Tech Rear Cover Question

I just got my new rear diff cover in. I was reading the directions to see how much fluid is needed. It said that if the truck has a limited slip, then I would need to add a additive to the oil. My question is, do we have a limited slip on the rear diff? I am getting ready to order some Amsoil 75w90 synthetic oil and need to know if I also need to get this additive?

2011 2500 Duramax 4x4
Air Lift Suspension Bags, 150db air horns with 2.5 gal tank and compressor, HID Hi/Low Beam and Fog lights. LED interior lights. Switch Back LED turn signal lights. Line X spray in bed liner.
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post #2 of 9 (permalink) Old 04-03-2012, 10:01 PM
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Absolutely you have a limited slip diff! It comes pretty standard with the tow package/4x4

2011 LML- H&S Motorsports CP3 over CP4 kit w/tunes from Kory Willis , 17x9 XD Misfits, 285-70-17 Cooper AT's, Spray on, tool box/50 Gallon Auxillary, tint all around, Ride Rite bags, Ride rite compressor system,H&S Mini Max, Cobalt Pyro, ready lift keys, 5" MBRP straight piped, Rare Part Tie rods, Cognito UCA's, Bilstein 5100's, Fass Titanium 150, ADP downpipe, EGR delete from ADP and Proflow up pipes and manifolds.

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post #3 of 9 (permalink) Old 04-04-2012, 07:09 AM Thread Starter
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Will I still need to add the additive if I use a full synthetic oil? I am going to use Amsoil full synthetic.

2011 2500 Duramax 4x4
Air Lift Suspension Bags, 150db air horns with 2.5 gal tank and compressor, HID Hi/Low Beam and Fog lights. LED interior lights. Switch Back LED turn signal lights. Line X spray in bed liner.
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post #4 of 9 (permalink) Old 04-04-2012, 08:17 AM
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No additive needed in a G80 "Limited Slip" axle. Straight gear lube in the Duramax.

The additive is only required when you have clutches in the rear axle--

Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry
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post #5 of 9 (permalink) Old 04-05-2012, 10:19 AM
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I called GM a month back and they said Synthetic 75w90 no additives. I installed PPE covers. Rear held a total of 5bottles and front was 2.5 bottles. When i changed the front their was the nastiest milk that came out and the truck has only 3200 miles on it.

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2012 Silverado 3500HD customized from Classy Chassis
Added PPE Deep Tranny Pan, Front and Rear Diff. PPE Covers, Mini Maxx, S&B Intake, CB, Trifecta Cover, and 24k Fifth Wheel.

2006 LBZ Grey CC Dually. 87k. BullyDog Exhaust. Banks Six Gun w/ IQ. Gutted Stock airbox. 24k Reese 5th Wheel Hitch.
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post #6 of 9 (permalink) Old 04-05-2012, 10:24 AM
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No additive needed as stated before. These trucks come with a locker, not a posi style limited slip.

06 ECSB GMC
30 gal. Transferflow Toolbox/Transfer tank combo
...and a few other things

-Erik
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post #7 of 9 (permalink) Old 04-08-2012, 05:51 PM Thread Starter
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Thanks everyone. I ordered my oil and waiting for it to get here.

2011 2500 Duramax 4x4
Air Lift Suspension Bags, 150db air horns with 2.5 gal tank and compressor, HID Hi/Low Beam and Fog lights. LED interior lights. Switch Back LED turn signal lights. Line X spray in bed liner.
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post #8 of 9 (permalink) Old 04-10-2012, 06:54 AM
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Quote:
Originally Posted by tazz3069 View Post
Thanks everyone. I ordered my oil and waiting for it to get here.
Glad to hear your running amsoil. I am a dealer, if you have any questions or need anything please let me know.

I just installed my aFe diff cover and didn't use an additive. It's working great.

2012 Chevy 2500HD Black CCSB Z71 Appearance Pkg[LIST][*]Congito 4-6" NTBD Lift - Fox 2.0 Resi Shocks[*]Cognito Uni-Ball UCAs & Pitman Idler Support Kit[*]Cogntio Sway Bar w/ HD End Links[*]Congito NCT Traction Bars[*]35" Nitto Trail Grapplers on 20" BMF R.E.P.R Wheels[*]H&S Mini Maxx - aFe 5" Straight Pipe[*]Rigid Ind LED - 50" & 20" E-Series, (4) Duallys, HIDs[*]AMP Running Boards - Titan 57gal Fuel Tank[*]aFe Transmission and Differential Covers
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post #9 of 9 (permalink) Old 04-10-2012, 04:45 PM Thread Starter
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Quote:
Originally Posted by dirtymaxx12 View Post
Glad to hear your running amsoil. I am a dealer, if you have any questions or need anything please let me know.

I just installed my aFe diff cover and didn't use an additive. It's working great.
That's good to know. I was really worried that i needed to add the additive to the oil. can hardly wait to get it on.

2011 2500 Duramax 4x4
Air Lift Suspension Bags, 150db air horns with 2.5 gal tank and compressor, HID Hi/Low Beam and Fog lights. LED interior lights. Switch Back LED turn signal lights. Line X spray in bed liner.
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