Open Rear?

[Toomanyhobbies]

My 2004 Tahoe was starting to lose traction and want to do one wheel burnouts when starting up hill. Tire tread is good but that shouldn't matter on dry pavement anyway. I assumed it had a G80 in it that was shot and when i took it to the garage mechanic told me it has an open rear. I pulled the window sticker this morning and it says "3.73 axle ratio" and it says it has the tow package which I remembered but is it possible it could have an open rear and have come with that high a gear ratio and the tow package? It's at the shop so I didn't look in the glovebox to see if it says "G80" as one of the codes.

Thanks

 

[915_Tahoe]

what the last 8 of your vin# i can check for you

 

[Toomanyhobbies]

4R253129

Thanks!

 

[Big Mama]

Very possible I don’t think all tow packages came with the same gears though you think they would.

 

[915_Tahoe]

by vin# it has a GT4 3.73 ratio, non-G80, 8.625 ring gear
other words, has open diff.

 

[SUBURBIAN]

These rigs were built in all kinds of configurations. Tow package does not require or include the G80 gov lock rear end.

 

[SnowDrifter]

I have the tow package (I think so anyway) and have 3.55 gears w/ g80

 

[SRQYukon]

How does one determine if they have the G80 posi rear diff? Mine has the GT4 (3:73) on the glove box decal, but I see that the GT4 can be either open or posi. I also have traction control which I assume use the gov-lock. But is that technically posi?

 

[Fless]

GT4 is the 3.73 ratio. You should have another Gxx RPO code for the actual diff.

 

[SRQYukon]

That just it. I see no G80 RPO code, but I'm being told this is a G80 diff? I'm the original owner so no chance its been changed.

 

[Fless]

What are all of your "G" codes?

 

[SRQYukon]

I see that 915_TAHOE was getting it from the VIN# (last eight digits), but I'm not sure how to decode that.

 

[Fless]

Don't you have an RPO sticker in the glovebox?

 

[SRQYukon]

My bad! I took a pic of the RPO code decal and I cropped off the last column. I went out and looked again. It does have the G80 RPO code in that last column. Thanks for the help.

 

[Fless]

G80: