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Hi all.

I have a 2000 Blazer 4x4 2dr LS (my 1st) and I would like to know if there is a way to tell visually whether it has had a high/wide package fitted to it. Reason for this is that I need to do a bit of front end work to it - ball joints and a lower control arm to be precise. I did have the VIN checked and it came back wit a negative on this. However, I recently had to do the rear rotors and backplates, and the VIN said the vehicle was fitted with the standard 7.625" diff. Not so. it actually has an 8.625" limited slip diff, and the suspension on it is, well lets just say I feel every bump in the road (OUCH).

Anyone have any pointers as to how I can tell if it was beefed up?

TinW

is yours a stick shift? i think that all the sticks were the larger rear end. but im not completely sure on that. if you check your RPO codes in the glove box, you will be looking for "ZR2" thats the higher/wider package.

No mine is automatic. Where in the glove box would I find the codes?

TinW

OK just looked in my glovebox and found the sticker (pretty mangled after 14 yrs) and found a whole host of codes on there one of them being ZR2. I am presuming that all these codes, assuming that was what you were referring to, have something to do with what the vehicle was fitted with at manufacture and that all of them are relevant to my vehicle. If my lack of knowledge seems a bit naieve, please forgive me as my last vehicle was a Land Rover which I owned for over 10 yrs.

TinW

RPO codes, (Regular Production Option) in the glove box has all of the options that your vehicle was equipped with when it was built. ZR2 has a different frame, (higher, wider). It's not something that can be "added" after the vehicle is built. Post all RPO's that start with "G" and we can figure out which rear axle and gear ratio you have.

Hey sorry to be so long in getting back. The two codes are GT4 and G80. Somebody mentioned too that the shocks could have something to do with the rock hardness of the suspension. All 4 are Bilstein shocks. Also when looking up the VIN for this vehicle it says it has 4 wheel ABS errr no it doesnt. It has front wheel ABS. I know this as I have had the rear end apart. Trust me to get the seemingly ~Odd One Out~

Cheers

Tin

GT4 = 3.73 ratio rear differential


G80 = Positraction limited slip axle

[QUOTE=TinW;623836]Hey sorry to be so long in getting back. The two codes are GT4 and G80. Somebody mentioned too that the shocks could have something to do with the rock hardness of the suspension. All 4 are Bilstein shocks. Also when looking up the VIN for this vehicle it says it has 4 wheel ABS errr no it doesnt. It has front wheel ABS. I know this as I have had the rear end apart. Trust me to get the seemingly ~Odd One Out~

Cheers
The sensor for the rear abs is mounted towards the rear of the trans housing.....:icon_playing:

Attached is a list of GM RPO Codes. Have fun looking up the codes from you car.

That looks like an all day affair there!!:icon_screwy::icon_emm::icon:icon_look:

Cheers for the humungous list :). Do I take it that the RPO sticker in the glovebox refers to everything my vehicle was fitted with, as I am getting a little confused about this. I ask because apparently the VIN number says one thing (E.G standard 7.625" non locking diff), and the RPO sticker says something different. Oh and originally it was a dealer who gave me a printout of the VIN when I asked if it was possible to tell the rear axle from the VIN. Nice when you have everything apart, no transport and the wrong part!

Cheers for your help guys

The RPO codes are what your car was built with. There are just too many options available for a VIN to specify every option that can be installed during production. So if you have a delta between the VIN and RPO code the RPO code takes precedence.

If you had the ZR2 (higherwider) package you'd have plastic fender flares and 31x10.5x15 factory tires for a couple of easy visual cues and like others have said you'd definitely have the ZR2 RPO code. I'm not positive, but I believe it is possible to have the standard 7.6" rear end with either the GU6 or GT4 gears along with the G80 locking diff. They're not exclusive to the ZR2's. The G80 was an upgrade option for quite a bit of the production run of the Blazers.

Thanks for that info. Yes I have the plastic fender flares and the 31x10.5x15 tyres and I know the ZR2 RPO is in the glovebox. Due to the help from you guys I have now figured out that the vehicle is a ZR2. All I have to do now is decode all the RPO`s from the list that was kindly supplied on here

Cheers for the help guys (:>)

Tinw

Check out compnine dot com, all you do is enter your VIN and it tells you every option. You can save it to your computer, or print it out.