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Lubricant recommendations


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I have a 2003 Suburban K-1500 LS and would like to change out all the fluids / lubricants to the front axle, rear axle, and transmission. What RPO codes or information can I post to get the most current recommendations for fluid-types and quantity. Also, is there a separate fluid for the transfer-case?

Thank you
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Basically your vehicle takes a 75w-90 gear oil for front and rear differentials. The engine is a 5w-30 and the transmission is a dexron VI fluid. Depending on if you have the AutotrakII transfer case, it takes the AutotrakII fluid from the dealer if it is a Transfer Case,NVG 236/246......SLF transfer case or it can take ATF fluid if it is the Transfer Case,NVG 261/263......GLS transfer case. Just need to know which one you have.

 

Powersteering is power steering fluid that you can get from most autoparts stores.

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Basically your vehicle takes a 75w-90 gear oil for front and rear differentials. The engine is a 5w-30 and the transmission is a dexron VI fluid. Depending on if you have the AutotrakII transfer case, it takes the AutotrakII fluid from the dealer if it is a Transfer Case,NVG 236/246......SLF transfer case or it can take ATF fluid if it is the Transfer Case,NVG 261/263......GLS transfer case. Just need to know which one you have.

 

Powersteering is power steering fluid that you can get from most autoparts stores.

What RPO codes would I look for regarding transfer case? Not sure what I have, other than push-button four-wheel drive with a neutral for the transfer case on a K1500 chassis with the 5.3L.

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What RPO codes would I look for regarding transfer case? Not sure what I have, other than push-button four-wheel drive with a neutral for the transfer case on a K1500 chassis with the 5.3L.

 

I don't know the RPO code right off hand but will get it tomorrow. Or MS3DALE on here can look it up for you as well.

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I don't know the RPO code right off hand but will get it tomorrow. Or MS3DALE on here can look it up for you as well.

Only the transfer case with the AUTO button on it uses AutoTrac II fluid as it has a clutch in it. All the rest use ATF Dexron III, even the push button w/o the AUTO button as its just electrically shifted and is same TC as manual floor shift version . Dexron VI is not recommended for any tc that calls for Dexron III as it may cause issues (per GM TSB).

 

This is the ONLY TC that used Auto Trac II, with the big round 'AUTO' button. Note-New models that use the Rotary dial use Dexron VI. Auto Trac II ceased to have any applications from 2007 onward with rotary dial TC's by MP (Magna Powertrain).

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Elcamino pretty much covered it best. From what I found out there isn't a straigh RPO code that covers an AutoTrac II transfer case. Having the Auto button is pretty much a sure sign that you do or do not have it.

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A little more detail re: transfer cases:

 

"Any vehicle that previously used DEXRON-III for a manual transmission or transfer case should now use p/n 88861800 (88861801 in Canada) Manual Transmission and Transfer Case Fluid. And power steering systems should now use p/n 89020661 (89021183 in Canada) Power Steering Fluid."

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Keep in mind that Dexron VI replaces III Dexron in GM hydramatic transmissions and its not a blanket replacement for all instances of Dexron III. This fact is always overlooked in relation to using Dexron VI.

 

Manual Transmission and Transfer Case Fluid is actually Dexron III, they just changed the name of it.

 

 

 

 

 

This information applies to 2007 and prior GM passenger cars and trucks.

Dexron III is being phased out as a product name. It is being renamed Manual Transmission Fluid and carries p/n 88861800 U.S. (88861801 Canada).
If fluid p/n 88861800 U.S. (88861801 Canada) is not yet available when servicing a manual transmission or transfer case, Dexron III can be used in its place.
DO NOT
use Dexron VI in place of manual transmission fluid in any manual transmissions or transfer cases that specify Dexron III, as a failure may result.

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