Front and Rear Diff cover recommendation and fluid swap - Chevy and GMC Duramax Diesel Forum
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Old 02-03-2013, 10:43 AM   eBay Motors  #1 (permalink)
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Front and Rear Diff cover recommendation and fluid swap

Hi,

Looking to get some insight on what front and rear diff covers folks are using. I am getting ready to pull the trigger on a 2013 LML.

What's the best differential fluid for these trucks? Is the stock stuff synthetic?

Thanks
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Old 02-03-2013, 10:45 AM   eBay Motors  #2 (permalink)
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im using the stock front and rear covers...and whatever fluid was in there when i bought it
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Old 02-03-2013, 12:18 PM   eBay Motors  #3 (permalink)
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Stock is synthetic:
SAE 75W-90 Synthetic Axle Lubricant (GM Part No. 89021677,
in Canada 89021678).
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Old 02-03-2013, 06:08 PM   eBay Motors  #4 (permalink)
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PPE is the only one Im aware of that offers a front diff cover for the GM IFS.
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Old 02-03-2013, 06:20 PM   eBay Motors  #5 (permalink)
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PPE, Maghytec and AFE have covers available. For fluid, AMSOIL Severe Gear 75W-90 is one of the best and has 100k mile drain interval.

If I can be of assistance, please don't hesitate to ask.
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Old 02-03-2013, 06:26 PM   eBay Motors  #6 (permalink)
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I have the front, rear, pto covers and tranny pan from ppe. I like them if you need pics let me know. I also used am soil extreme gear oil. 75-90.
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Old 02-04-2013, 05:03 PM   eBay Motors  #7 (permalink)
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Left the front stock - rear went with the PML cover (1 quart over stock cover). Stock fluid is synthetic. I use 75X90 Mobil 1 synthetic gear fluid.

SAE 75W-90 Synthetic Axle Lubricant per the manual. Look for a GL5 rating on the bottle.

Changed the rear end fluid after the first 600 miles of towing and again when I installed the PML cover.

Avoid high loads, trailer towing and high speed extended driving during the initial break in of the vehicle. After the break in period axle temps will level at a much lower figure.
Gear Lube changes are a good idea because the additives are replenished and contaminates such as casting sand are eliminated.

Spare tire - got rid of the steel wheel so I can rotate the spare in when I rotate the tires.
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Old 02-04-2013, 05:26 PM   eBay Motors  #8 (permalink)
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Here are a few.





















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2012- Denali HD 4x4 2500
Xpel clear bra, amp steps, Inyati Bedliner. Rancho RS5000 Steering Stabilizer-Rancho 9000XL Shocks
PPE PTO-front/rear/Allison covers with transynd and amsoil severe gear oil. Magna-flow DPF back exhaust.

Last edited by 48548; 02-04-2013 at 05:28 PM.
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Old 02-04-2013, 05:36 PM   eBay Motors  #9 (permalink)
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If you want to save a few bucks the pml or factory aam dodge cover is cheaper for the rear. Goto the drivetrain forum and guy just installed it, pretty nice looking. When I got them all I got a deal on everything which saved me quite a few bucks as well. I paid 235 each for the tranny pan/rear cover and 223 for the front and 72 for the pto. I think total was 899 with 9 quarts of amsoil severe gear oil.
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2012- Denali HD 4x4 2500
Xpel clear bra, amp steps, Inyati Bedliner. Rancho RS5000 Steering Stabilizer-Rancho 9000XL Shocks
PPE PTO-front/rear/Allison covers with transynd and amsoil severe gear oil. Magna-flow DPF back exhaust.
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Old 02-04-2013, 05:49 PM   eBay Motors  #10 (permalink)
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see they have the front end where you can actually work on it now, Wonder if I can put an LML front diff in my 05 fairly easy?
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