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Fluids Change ?

DareDog

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DareDog Enthusiast

DareDog

Posted
Posted

2005 1500 5.3 L 124k had truck since 70k and figure its time to change the fluids in the front and rear diff, and also transfer case. what brand oil is good to use? is it ok to use 75w-90 in both differentials? front calls for 80w-90 and rear is 75w-90. For rear should replace the gasket or reuse old one? The cover is getting rusty should sand blast it and paint it or buy a new cover for it? For transfer case it calls for Auto Track 2, why does newer gm's call for ATF? use auto track or ATF?

diyer2 Senior Enthusiast

diyer2

Posted
Posted

It's never to late but late you are IMO.

Any brand oil is OK.

New gasket. :happysad:

newdude Senior Enthusiast

newdude

Posted
Posted

Put 75w90 in the front. GM had a bulletin a time ago when those were new for cold weather operation concerns. Called for changing the front diff fluid to 75w90.

DareDog Enthusiast

DareDog

Posted
  • Author
Posted

It's never to late but late you are IMO.

Any brand oil is OK.

New gasket. :happysad:

 

what millage should it be changed at?

sdeeter19555 Senior Enthusiast

sdeeter19555

Posted
Posted

Most of us fall under the "severe service" maintenance schedule in the owners manual.

 

I'm not sure there is a scheduled change for the differentials, but the transfercase is something like every 50k?

 

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Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted

As stated above you can use 75w-90 in front, no problem. The transfer case is Auto TrakII or AMSOIL's ATF fluid will work. It takes 2qts.

 

If you have the time, sand blast the rear cover, wash it really well and install with a new gasket. Just make sure you cover up the open rear diff so nothing can get in, even if it is inside a garage. Better safe than sorry.

 

If you are interested in AMSOIL for your fluids send me a PM of your ship to address and what you want and I can get a quote out to you.

  • 3 weeks later...
DareDog Enthusiast

DareDog

Posted
  • Author
Posted

only a 1/4 of a quart came out of the transfer case, it hods 2. some how 1 quart must have leaked out some time. Have not checked the fluid level on it in a while

 

 

.

GhostWriter Enthusiast

GhostWriter

Posted
Posted

Dang.

 

Seems like I researched this, last winter, & the consensus was to stay with the 80-90 non-synthetic, due to leakage issues with the synthetic.

 

Must have miss-read something.

sdeeter19555 Senior Enthusiast

sdeeter19555

Posted
Posted

Dang.

 

Seems like I researched this, last winter, & the consensus was to stay with the 80-90 non-synthetic, due to leakage issues with the synthetic.

 

Must have miss-read something.

Conventional 80w90 is perfectly fine for a front differential that sees limited use...a lot of cars and trucks out there with loads of miles on 80w90 that never got changed.

 

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GhostWriter Enthusiast

GhostWriter

Posted
Posted

Thanks for the info.

 

Even with the 80-90, differential still leaks on driver's side. Seems like most experience the same thing. Wish there was a fix.

sdeeter19555 Senior Enthusiast

sdeeter19555

Posted
Posted

Thanks for the info.

 

Even with the 80-90, differential still leaks on driver's side. Seems like most experience the same thing. Wish there was a fix.

Replace seal...

 

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Z45 Senior Enthusiast

Z45

Posted
Posted

Dang.

 

Seems like I researched this, last winter, & the consensus was to stay with the 80-90 non-synthetic, due to leakage issues with the synthetic.

 

Must have miss-read something.

I have run synthetic in my front and rear differentials for decades in numerous GM trucks and cars and NEVER had any leaks. Lots of misinformation about synthetics and they get blamed for poor gaskets and shoddy workmanship.

dasimmon Enthusiast

dasimmon

Posted
Posted

got cover blasted and painted.

 

 

76bbb9bcc2c5a05aceccd64610f6c302.jpg\

 

 

bc6a633f380eb39df349b7f944c6f2da.jpg

good lord, what a difference

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