How do I know what transfer case I have? This is the only label I could find. 98 Yukon 4x4.

[olliec420]

Button has the 'Auto 4HI' button but I think its an aftermarket switch panel.

I understood that the 98 4x4s with "Auto 4Hi" push button 4wd take AutoTrak II fluid. I bought the fluid but have been holding off changing fluid because I want to be sure I got the right stuff. Can I find the exact t-case model in the RPO codes? Or am I looking for a label on the case itself?

 

[exp500]

It is in the RPO List. Post a Pic.

 

[olliec420]

It is in the RPO List. Post a Pic.

 

[OR VietVet]

NP8 transfer case code. GM246 transfer case. Gets the "rub" problem.

Description:

This transfer case is one of the so-called "automatic transfer cases,” or “active transfer cases.” This description results from the fact that the 246 has an "automatic 4WD function,” a 2WD position, a 4WD High function, neutral and 4WD Low position. Driving the vehicle in 2WD has all torque flowing through the transfer case to the rear driveshaft, and the vehicle operates just like a 2WD vehicle.​

 

[olliec420]

NP8 transfer case code.

Is that the NGV246 and takes the AutoTrak II fluid?

 

[OR VietVet]

GM auto track fluid part # GM 12378508 Royal Purple shows Syncromax for this application.

 

[olliec420]

GM auto track fluid part # GM 12378508 Royal Purple shows Syncromax for this application.

Awesome, thanks.

 

[Fless]

There should also be a tag on the transfer case, and the NP246's take ACDelco Auto Trak II fluid; it's blue. Two quarts and you'll have a little left over.

 

[olliec420]

There should also be a tag on the transfer case, and the NP246's take ACDelco Auto Trak II fluid; it's blue. Two quarts and you'll have a little left over.

View attachment 393531

I looked for a tag and I couldn't find it. So are you saying mine does not take AutoTrak II?

 

[Fless]

If you have NP8 for an RPO code and the transfer case hasn't been changed to something else, it's the NP246 and does take Auto Trak II.

IIRC the tag is only a couple of inches in diameter.

 

[olliec420]

If you have NP8 for an RPO code and the transfer case hasn't been changed to something else, it's the NP246 and does take Auto Trak II.

Is there a difference between NGV246 and NP246? My previous searches said NP8=NGV246.

 

[Fless]

Is there a difference between NGV246 and NP246? My previous searches said NP8=NGV246.

Same thing. Company names changed. New Venture vs New Process.

 

[olliec420]

Same thing. Company names changed. New Venture vs New Process.

Gotcha, thank you for clarifying.

 

[Fless]

If you like history..... https://en.wikipedia.org/wiki/New_Venture_Gear

 

[olliec420]

If you like history..... https://en.wikipedia.org/wiki/New_Venture_Gear

Very interesting!

 

[Fless]

When you're changing the fluid maybe you could see if yours has a tag:

 

[olliec420]

When you're changing the fluid maybe you could see if yours has a tag:

View attachment 393533

I looked for it when I was under there last but I didn't see anything but I also didnt know where to look and a lot of it has some dirt and grime on it. This was the only label I quickly found.

 

[Fless]

Now you have me second-guessing the fluid. That label clearly specifies transmission fluid.

 

[olliec420]

Now you have me second-guessing the fluid. That label clearly specifies transmission fluid.

Yes but if its an original sticker from 98... Was there AutoTrack back then?

 

[Fless]

Not a clue. Maybe @rockola1971 would have an idea?