Changing rear end fluid

[GTUSN2006]

I am going to change the fluid in my front and rear diffs tomorrow. Do I need to put in the anti-slip additive like you do on posi cars?

 

I have a 2004 2500hd ccsb 6.0 with 4.10s and a locking rear.

[bobcat5544]

SAE 75W-90 Synthetic Axle Lubricant this is all you need, you dont need the additive if you use Synthetic

[Butch 02 Denali]

Yup, what Matt said!

 

Use the synthetic in the front too!

 

Might as well do the T-case while you're at it. 2 qts of GM blue Autotrac fluid is about the best for ALL t-cases, next choice is synthetic ATF.

[bobcat5544]

Yup, what Matt said!

 

Use the synthetic in the front too!

 

 

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Might as well do the T-case while you're at it. 2 qts of GM blue Autotrac fluid is about the best for ALL t-cases, next choice is synthetic ATF.

 

never put gear lube in that t-case. to thick and it will burn up the clutches on side. only use GM blue Autotrac fluid

[Butch 02 Denali]

Yup, what Matt said!

 

Use the synthetic in the front too!

 

 

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Might as well do the T-case while you're at it. 2 qts of GM blue Autotrac fluid is about the best for ALL t-cases, next choice is synthetic ATF.

 

never put gear lube in that t-case. to thick and it will burn up the clutches on side. only use GM blue Autotrac fluid

 

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Matt, synthetic ATF is Automatic Transmission Fluid!

[bobcat5544]

Info - Improved Automatic Transfer Case Fluid #99-04-21-006 - (Sep 2, 1999)

Improved Automatic Transfer Case Fluid

1999-2000 Cadillac Escalade

 

1998-2000 Chevrolet and GMC K/T 4-Wheel Drive Pickups and Utility Models

 

1999-2000 Chevrolet and GMC L Van Models

 

1999-2000 Oldsmobile Bravada

 

with Active Transfer Case (RPOs NP4, NP8)

 

Effective with vehicle production in late June of 1999, all active transfer cases on the above listed vehicles have been filled with Autotrak® II fluid, P/N 12378508 (P/N 10953626 in Canada). This fluid is a light blue color rather than the red color of the previous fluids and is the next generation Automatic Transfer Case Fluid. The fluid also contains a better friction modifier.

 

On the models listed above, the active transfer cases should only be serviced using P/N 12378508 (P/N 10953626 in Canada), even if the original fluid was the red Autotrak® fluid. The previous fluid and the new fluid can be mixed or topped off if necessary. The new Autotrak® II fluid will be the only available fluid once the supply of the old red Autotrak® fluid is exhausted on units older than stated above.

 

The Owner's Manuals and some service information will specify the incorrect fluid due to printing the information prior to the fluid change being introduced.

[builderpaul]

Yup, what Matt said!

 

Use the synthetic in the front too!

 

Might as well do the T-case while you're at it. 2 qts of GM blue Autotrac fluid is about the best for ALL t-cases, next choice is synthetic ATF.

 

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Should I use the autotrac fluid in my Manuel shift case? It's not autotrac. My service manual lists different fluids for the autotrac and Manuel.

[bobcat5544]

USE AUTO TRANS FLUID FOR MANUAL SHIFT T-CASE

[GTUSN2006]

Thanks guys.

 

Anyone know what else is involved in the 30,000 mile service GM recommends? Pretty sure it was diff fluid, front and rear, trans fluid, transfer case fluid and cleaning the carbon from the throttle body. Anything i forgot?

 

Oh, and they wanted $485 to do it for me. Maybe thats bc I overheard a technician who said 22 something for quart of synthetic 75W-90. That must be some good gear lube, bought my mobile 1 today for 9 bucks a quart...but you can read my rant about that dealership in the off-topic section.

[Butch 02 Denali]

GM Autotrack blue is the best fluid for ALL T-cases, manual included, but must be used for all Autotrac cases.

 

The dealer will usually change to the blue fluid on a manual case to cure noises.

 

As I mentioned, Blue is the best. Next choice for a manual box is synthetic ATF.

[Trooper]

I am at the same point in maintaining my truck. Where did you find the capacity listing for the various parts?. ie front and rear diff. trans. transfer. My owners book list what type of fluid to use but not how much to buy. Thanks

[GTUSN2006]

I used about 2.5 quarts for the rear and around 2 for the front.