GM 75w-90 Synth, As good as other synth gear oils?

[NHHEMI]

 Originally Posted By: gmctodd

 Originally Posted By: NHHEMI

The Autotrak II fluid was for the electronic( ie; dash control to shift )t-case. 1/2 tons only I believe.

Per my GM dealer the autotrak II fluid is for transfer cases that switch automatically between 2 and 4 wheel drive (button labeled AUTO) not the electric shift models in 2500 HD pickups

I was unware the HD models had anything but a manual floor shifter? When I say "electric shift" I am referring to the push button or knob( NBS )on the dash in the 1/2 tons. Yes, those with the AUTO 4WD option.

 

[xxch4osxx]

 Originally Posted By: Jim 5

I'm talking Canadian Dollars, so you can reduce that price by another 20% or so. We usually pay around $10 per oil filter and about $20 for the spin on trans filter. The synthetic gear oil usually runs close to $30 and Mobil 1 synth retails for around $18. Not sure about the autotrac II, but as it turns out, that's not the fluid for my transfer case after all. Looks like its Dex VI.

I just bought some auto-trak fluid a couple weeks ago from a local GM dealer and I paid $9 per liter, thats Canadian funds.

 

[gmctodd]

 Originally Posted By: NHHEMI

 Originally Posted By: gmctodd

 Originally Posted By: NHHEMI

The Autotrak II fluid was for the electronic( ie; dash control to shift )t-case. 1/2 tons only I believe.

Per my GM dealer the autotrak II fluid is for transfer cases that switch automatically between 2 and 4 wheel drive (button labeled AUTO) not the electric shift models in 2500 HD pickups

I was unware the HD models had anything but a manual floor shifter? When I say "electric shift" I am referring to the push button or knob( NBS )on the dash in the 1/2 tons. Yes, those with the AUTO 4WD option.

My 2500 HD has push button shift on the dash, 3 buttons (2Hi, 4Hi, and 4Lo) very rare to see a manual shift (lever on floor) around here anymore! My GF's Envoy has a knob 2Hi,AUTO,4Hiand4Lo. It requires the autotrak II fluid

 

[Jim 5]

In summary, it appears that if your GM transfer case has an "AUTO" selection, then it uses the Autotrak II.

 

[Jim 5]

 Originally Posted By: Jim 5

In summary, it appears that if your GM transfer case has an "AUTO" selection, then it uses the Autotrak II.

Of course, if I was brighter, I would simply have looked at the owner's manual.

 

[Mike_dup1]

We had some HD2500's at work with manual TC and floor shift but they were basic work trucks that were fleet ordered. If you try to option a truck with anything but basic features, it will force the automatic TC.