Transfer Case Maintenance - Chevy and GMC Duramax Diesel Forum
2017-19 GM T-K2 Platform 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 11 (permalink) Old 01-04-2020, 02:32 PM Thread Starter
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Transfer Case Maintenance

Just a friendly reminder to change out your factory transfer case fluid sooner than later. Picture below is my drain plug magnet at only 27,000 miles on my 2019 Chevy. Usually try to do this within the first 10,000 miles, but unable to dedicate the time until the recent Holidays.
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2019 Chevrolet Silverado 3500HD 6.6L Duramax (L5P) Crew Cab 4x4 SRW Standard Box High Country Loaded w/ Rear Entertainment Package, Fabtech 4” Suspension Lift w/ 35’s on Vision Valor Wheels, Luverne Grille Guard w/ Parking Sensor Relocation Kit, Rhino Roll Bar (Sport Bar 2.0) w/ 8” Hella Off-Road Lights, Banks Derringer / iDash / Intake / DPF Back Exhaust, Fabtech Stealth Shocks w/ Front Limit Straps, Front & Rear Hellwig Sway Bars, Airlift Air Bags w/ Wireless Air, DuraFlap Mud Guards, S&B MAP Sensor Spacer
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post #2 of 11 (permalink) Old 01-04-2020, 02:37 PM
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Wow!! Thx for heads up


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post #3 of 11 (permalink) Old 01-04-2020, 02:51 PM
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My dads 2016 LML with the first change at 46k miles. The fluid was starting to get dark brown.
My 2017 L5P at ~16k miles/ 730 engine hours. The fluid was still cherry red but had visible metal in the fluid.
I also changed the spin-on trans filter at the same time, the filter media was getting pretty loaded. The transmission filter magnet had some fuzz on it but didn’t look terrible.

I haven’t changed my front and rear diffs yet, but plan to soon. I think getting the break-in wear out early is important.


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post #4 of 11 (permalink) Old 01-04-2020, 03:05 PM Thread Starter
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Quote:
Originally Posted by EmmettTheL5P View Post
My dads 2016 LML with the first change at 46k miles. The fluid was starting to get dark brown.
My 2017 L5P at ~16k miles/ 730 engine hours. The fluid was still cherry red but had visible metal in the fluid.
I also changed the spin-on trans filter at the same time, the filter media was getting pretty loaded. The transmission filter magnet had some fuzz on it but didn’t look terrible.

I haven’t changed my front and rear diffs yet, but plan to soon. I think getting the break-in wear out early is important.
We think alike.

I did my transfer case, outer transmission filter (2nd time), front & rear differentials, fuel filter (3rd time), and an oil change all at the same time ... about 4 hours in our home garage on my back.

Rear diff was already getting fairly black ... so it was ready to be changed. Front was still caramel-colored and probably did not need to be changed. However, I changed both diff’s so they have the same fluid. Mobil Delvac 75W-90 was available at a great price thru Summit.

Only thing left is the tranny fluid and the internal tranny filter. Not looking forward to this project ... I always make a big mess on this one ... especially in a home garage on my back.

2019 Chevrolet Silverado 3500HD 6.6L Duramax (L5P) Crew Cab 4x4 SRW Standard Box High Country Loaded w/ Rear Entertainment Package, Fabtech 4” Suspension Lift w/ 35’s on Vision Valor Wheels, Luverne Grille Guard w/ Parking Sensor Relocation Kit, Rhino Roll Bar (Sport Bar 2.0) w/ 8” Hella Off-Road Lights, Banks Derringer / iDash / Intake / DPF Back Exhaust, Fabtech Stealth Shocks w/ Front Limit Straps, Front & Rear Hellwig Sway Bars, Airlift Air Bags w/ Wireless Air, DuraFlap Mud Guards, S&B MAP Sensor Spacer
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post #5 of 11 (permalink) Old 01-14-2020, 10:36 AM
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UT,
What fluid did you use in your xfer case? The 75w-90? Just wondering as my 4500 shows a synthetic 50W in the xfer and the 75W-90 synthetic in both diffs.
I just hit 10K on the truck so after seeing your pics-- off to the store to find some fluid. Thanks for the post

2019 Chevrolet 4500HD CC 4X4 Flatbed
2018 Chevrolet 1500 CC 4X4 High Country 6.2 liter
2019 Chevrolet 3500HD CC 4X4 Flatbed--SOLD
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1957 GMC 1 ton flatbed with 22K original miles.
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2003 Chevrolet 2500HD CC: 2011 Chevrolet 3500HD CC 4X4 and 2013 3500HD ex. cab 4X4-- all sold.
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post #6 of 11 (permalink) Old 01-14-2020, 03:15 PM
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Quote:
Originally Posted by sambor View Post
UT,
What fluid did you use in your xfer case? The 75w-90? Just wondering as my 4500 shows a synthetic 50W in the xfer and the 75W-90 synthetic in both diffs.
I just hit 10K on the truck so after seeing your pics-- off to the store to find some fluid. Thanks for the post
Book calls for

DEX VI ATF in the transfer case
75W-90 synthetic in the front and rear diff.
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2018 GMC 2500 L5P CCSB 4x4 Denali - Mineral Metallic; previous '11 LML, '10 LMM and 04.5 LLY
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post #7 of 11 (permalink) Old 01-14-2020, 10:08 PM
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Just picked up some DEX VI ATF for the transfer case. Could only find it in synthetic. Can't wait to see the shavings!
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post #8 of 11 (permalink) Old 01-20-2020, 09:53 AM
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Just changed the fluid in the transfer case and rear diff. @ 10786 on the 4500HD. I used Delvac 50W synthetic in the T-case and Delvac 75W-90 synthetic in the rear diff.OM calls out these weights and synthetics for all 3 gearsets. Going to use the same in the front when I can get the truck away from the wife. I did find a gray paste on the T-case drain plug but no flakes etc. On the rear I did find one flake and very light gray paste.
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2019 Chevrolet 4500HD CC 4X4 Flatbed
2018 Chevrolet 1500 CC 4X4 High Country 6.2 liter
2019 Chevrolet 3500HD CC 4X4 Flatbed--SOLD
2011 Peterbilt 337 hauler with 360HP 8.3 Cummins--SOLD
1957 GMC 1 ton flatbed with 22K original miles.
3 different Kubotas
2003 Chevrolet 2500HD CC: 2011 Chevrolet 3500HD CC 4X4 and 2013 3500HD ex. cab 4X4-- all sold.
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post #9 of 11 (permalink) Old 01-26-2020, 07:52 PM Thread Starter
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Quote:
Originally Posted by sambor View Post
UT,
What fluid did you use in your xfer case? The 75w-90? Just wondering as my 4500 shows a synthetic 50W in the xfer and the 75W-90 synthetic in both diffs.
I just hit 10K on the truck so after seeing your pics-- off to the store to find some fluid. Thanks for the post
Sorry for the delayed response.

Mobil Delvac 75W-90 fully synthetic in the front and rear diffs.

Mobil Dexron VI ATF (synthetic blend) in the transfer case ... plan to change it every 25k anyway.

Side Note: Mobil Dexron VI ATF synthetic blend is designed to meet the stringent service fill requirements of GM’s DEXRON-VI specification. Mobil DEXRON-VI ATF provides limited warranty protection for 2006 and newer GM vehicles.

2019 Chevrolet Silverado 3500HD 6.6L Duramax (L5P) Crew Cab 4x4 SRW Standard Box High Country Loaded w/ Rear Entertainment Package, Fabtech 4” Suspension Lift w/ 35’s on Vision Valor Wheels, Luverne Grille Guard w/ Parking Sensor Relocation Kit, Rhino Roll Bar (Sport Bar 2.0) w/ 8” Hella Off-Road Lights, Banks Derringer / iDash / Intake / DPF Back Exhaust, Fabtech Stealth Shocks w/ Front Limit Straps, Front & Rear Hellwig Sway Bars, Airlift Air Bags w/ Wireless Air, DuraFlap Mud Guards, S&B MAP Sensor Spacer
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post #10 of 11 (permalink) Old 01-27-2020, 09:02 AM
 
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Just did my transfer case yesterday because of this thread. Mine was just as bad as the original posts. Changed my fluid to AMSOIL ATF. Just an observation from my point, get the normal quart bottles with quart bottle pump.... not a lot of room by the fill bolt for the easy fill bags from AMSOIL.


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