anyknow if a rear axle off of a 02 trailblazer2 wheel dr with the g80 option willbolt intoa 04 xtreme blazer? or should i just take the internals from the pumpkin to convert my xtreme with the g75into a g80.

 

The rear axle on the GMT360/370 platform vehicles is a 4 link setup, not leaf spring. It will not bolt in to an s-series vehicle. The internals should swap provided it is a 7.625" axle. Some of them came with the 8.5" axle.

And, are you sure of the RPO code you listed...? It doesn't sound like a normal s-series axle ratio code...
G75 - AXLE REAR, 3.62 RATIO

So if you do not have G80 on your RPO list, then you would need the whole differential from the vehicle you are pulling from. If it doesn't have the same axle ratio (which I HIGHLY doubt that it would), then you would need to swap the ring gear.

 

yes on my 04blazer xtreme that is the rpo code off the glovebox sticker I have no idea why this truck came without the g80 which sucks my last xtreme had it and this doesnt

 

Is your truck a 5-speed by any chance?

 

nope auto

 

Hmmm.... That's weird then.

Maybe you still managed to get the 8.5" axle... Which should only be on ZR2's and 5-speeds... Unless specially requested...

I'm gonna go digging through my RPO codes and see what I can find...

 

looked at the trailblazer tonight and it wont work so im just gonna go find one in a junkyard close by i guess its not that i need the g80 though id like to have it

 

i didnt get this truck new or anything so i dont know of any special requests though it seems by whats there and whats not a lot of stuff was added onto it and different from the package options offered in 04

 

well GU6 comes back to a 3.42 on the rpo sites list

 

G80 is the standard GM RPO code for the gov-loc diff... In all vehicles. So find a junked S-series with G80 in the dash.

GU6 is the normal s-series code for 3.42 gears...

For an S-series, G75, the code you specified in your first post, gives you GVW RATING , "4,550 LBS"

It's not a gear related code, it seems...