Guests - If You want access to member only forums on FM. You will gain access only when you Sign-in or Sign-Up on Fishing Minnesota.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
federline

GM 1/2 ton autotrac xfer case oil

3 posts in this topic

So I just performed 4x4 service (both diffs and xfer case) last weekend. The truck is a 99 Silv 1/2 ton with autotrac. The previous times I did it, I only did the differentials (always Mobil 1 gear oil), and had the xfer case done with the auto tranny service.

I always thought that you had to use the "blue smurf oil" for the xfer case because of GM's "special friction formulation" to assist the autotrac system. But when I drained the xfer case, I got what looked and smelled like red auto trasmission fluid.

Does anyone in-the-know think there could have been any damage done? Or can you safely substitute ATF for the Smurf oil? It's not like the Smurf oil is terribly expensive, $6 per quart from the stealer, 2 qts required. I'm just curious, and possibly a little worried - but I can notice no problems with the autotrac function, just used it in the mud again this weekend.

Share this post


Link to post
Share on other sites

GM has transfer cases that take different fluids. First of all here's how to tell which you should use:

1. If your transfer case is an electronic shift - that is you just have a push button to control it - you MUST use the GM blue fluid.

2. If you have a manual or floor shifter use the Dexron spec - the same as what goes in your automatic transmission.

(Also GM changed from Dex III to Dex VI in 2006 with everything, a few in 2005.)

The two fluids are NOT interchangable. If yours is supposed to have the blue and it had Dexron change it back to the blue, someone has apparantly put in the wrong fluid. As to damage, unknown, but get the correct fluid back in it.

As far as I know the blue 'smurf' fluid is only available from GM.

Share this post


Link to post
Share on other sites

Thanks oilman, it is as I suspected. I appreciate the confirmation. We're all smurfed up, now.

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • mrpike1973
      2 catfish, small but boy it brought a smile to me.
    • mrpike1973
      I believe it is the 49 bridge just a little south of there. Lots of ice chunks coming down.
    • Huntin&Fishin
      How far did you get?
    • Flyin Ryan
      I fished the river on Saturday and saw at least a dozen different full sized trucks going in and out of the bays and all over the Arrowhead Flats. Since then an F150 and several ATV's have gone through. Just like Big Country predicted, another one today. Under the Oliver Bridge an old timer on a 6 wheeler spent 30 minutes in the water before a passerby noticed him holding onto the ice. Please be safe, tell your friends, tell anyone who talks fishing. Any ice right now is sketchy
    • Fishing Frenzy
      A buddy of mine was out fishing last night and some guy drilled a big spear hole in the ice and never marked it or out the ice back in the hole. My buddy told me the ice block wasn't even by the spear hole he almost fell in! Reminder to always mark your spear hole and keep a careful eye out to make sure you don't step in one!