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Fluid change

SxViper

By SxViper
in 2000-2014 Silverado HD & Sierra HD

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SxViper Enthusiast

SxViper

Posted
Posted

I am going to be changing my fluids in my 2002 2500HD. I want to change the transmation fluid out to synthetic. I was told to just dump the pan and fill backup with synthetic. This would get rid of a good amount of the non-synthetic but not all and just do that the next few times and I would be a full synthetic about the third time. Good idea?? Is there an easy way to do it all at once?

 

 

Also this is a 4x4 and was wondering for the transfer case. It says to use Autotrack II fuild in the owner manual. Where the heck can I get this? Or is it like ATF fuild like my S10 did?

 

Anyone know where to mobil 1? I am looking for 80w-95 for the front axle and can not seem to find it around here. I figuring ordering it online is my only hope.

bigdogs Senior Enthusiast

bigdogs

Posted
Posted
I am going to be changing my fluids in my 2002 2500HD. I want to change the transmation fluid out to synthetic. I was told to just dump the pan and fill backup with synthetic. This would get rid of a good amount of the non-synthetic but not all and just do that the next few times and I would be a full synthetic about the third time. Good idea?? Is there an easy way to do it all at once?

 

 

Also this is a 4x4 and was wondering for the transfer case. It says to use Autotrack II fuild in the owner manual. Where the heck can I get this? Or is it like ATF fuild like my S10 did?

 

Anyone know where to mobil 1? I am looking for 80w-95 for the front axle and can not seem to find it around here. I figuring ordering it online is my only hope.

 

 

 

 

 

The only way to swap all all the tranny fluid at once is a flush. As far as the transfer case, I didn't think the 2500HD's had AutoTrak, I know mine does not. If you can't find 80W90 Mobil you can use the 75W-90 as that is close enough. The "problems" happen when you use the 140W stuff especially in cold weather.

Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted

The Auto Zone here carries the Mobil 1 80-95 oil.

 

I didn't think the 2500HD's had the Auto Trak II either. Well live and learn. If so they you need to use that fluid and only that stuff, Only place to get it is the dealer. As far as I know no other manufacture makes a replacement for the Auto Trak II.

 

It might be a pain in the butt, but to drop your pan and change the filter then fill up with synthetic is an easy way to start the process. Then on your next oil change just drain the transmission pan at the same time as you change your oil and filter. Do this at every engine oil change for at least 3 and you will have changed out 99% of the fluid. This is a lot cheaper than doing it all up front at one time with a flush. Don't get me wrong there isn't anything wrong with flushing it, just that this method is eaiser on the wallet.

SxViper Enthusiast

SxViper

Posted
  • Author
Posted

I have push button 4x4 but for some reason in the book it says that autotrak II stuff which to me is weird.

 

 

 

Just looked on Mobil1's website and they dont' even make a 80w90 so I will just go with the 75w90. There is no way to tell the difference is there if something should go wrong with the front diff?

 

 

Thanks for the info.

Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted

You will be just fine with the 75w-90. There are several of us that are using that and no problems at all.

 

I remember reading in here that if your transfer case used regular ATF that you could put the AutotrakII in it but if you had the AutotrakII you can't put regular ATF in it. The internal design of the Autotrak transfer case requires the AutotrakII fluid. Do a search on here and you will come up with all kinds of good info.

SxViper Enthusiast

SxViper

Posted
  • Author
Posted
You will be just fine with the 75w-90. There are several of us that are using that and no problems at all.

 

I remember reading in here that if your transfer case used regular ATF that you could put the AutotrakII in it but if you had the AutotrakII you can't put regular ATF in it.  The internal design of the Autotrak transfer case requires the AutotrakII fluid.  Do a search on here and you will come up with all kinds of good info.

 

 

 

 

 

I wouldn't think I have the autotrak 4x4 in a 2500HD... This is a 2002...

Mighty HD Senior Enthusiast

Mighty HD

Posted
Posted

Lets clear this up

 

If you have the BLUE fluid in your transfer case, you need to go to the dealer and get the autotrak transfer case fluid. REGUARDLESS IF YOU HAVE AUTOTRAK OR NOT! My 00 S-10 ZR2 had the blue stuff.

 

If you have RED fluid, you CAN use ATF but there is a tsb on GMSI that states to use the new autotrak fluid.

:devil:

mhraracing Enthusiast

mhraracing

Posted
Posted

I did my Transcase a few weeks ago - it was red - but I put in the Blue stuff. Not to highjack thread - but at what milage are you guys dopping the pan of your Trannys and doing the filter. My HD has 28k on it and was thinking it is getting close to time. I think I would drop the pan and filter and refill with Mobil 1 synthetic ?? Thoughts.

Thanks

bigdogs Senior Enthusiast

bigdogs

Posted
Posted
If you have RED fluid, you CAN use ATF but there is a tsb on GMSI that states to use the new autotrak fluid.

:devil:

 

 

 

 

Do you happen to know the number of that TSB? I'm curious as to why GM would now recommend using the AutoTrak in not AutoTrak transfer cases. IOW what does it fix or improve on over ATF? I don't think it is pure synthetic is it?

bigdogs Senior Enthusiast

bigdogs

Posted
Posted
I did my Transcase a few weeks ago - it was red - but I put in the Blue stuff. Not to highjack thread - but at what milage are you guys dopping the pan of your Trannys and doing the filter. My HD has 28k on it and was thinking it is getting close to time. I think I would drop the pan and filter and refill with Mobil 1 synthetic ?? Thoughts.

Thanks

 

 

 

 

I changed my external filter at 5K miles. I'm not sure what the next interval for that one is, 25-30K I'm guessing but will have to look. I think the internal one does not get changed until 50K

mhraracing Enthusiast

mhraracing

Posted
Posted

Thats what I figured for the Allison....but I should have mentioned that I have 4l80e as I have the 6.0L. I know still a HD - but not as HD as the DM or 8.1's ?!?! :devil:

chevroletmb Enthusiast

chevroletmb

Posted
Posted

the push button 4wd still uses atf in the t-case unless the switch has the auto 4wd button then it needs autotrak fluid

also any vehicle with all wheel drive ie safari or any suv's also take autotrak fluid

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