The reason i ask is because every other 1999/2000 Blazer i have looked at have 235/70-15 tire size, but on my car the tire size is 31x10.50R15 and it also says so in my cars vehicle registration

On the drivers side door there is a GM sticker where it says that the tire size is 31x10.50R15

The car have four buttons where you can choose: auto 4WD high, 2WD high, 4WD high and 4WD low

I did a search on the net just now and came up with a web site that mention Blazer versions where it says 2 wheel drive, 4 wheel drive and LS with Off-Road Suspension (31x10.50R15LT/C)
https://www.goodyear.com/en-US/tires...et/blazer/1999

I thought that all 4WD Blazers was kind of off road

So does my old Blazer LS have "Off-Road Suspension" since it haves the 31x10.50R15LT tire dimension on the vehicle registration and the original GM tag on the drivers side door?

 

Based on the pic in your avatar you have a ZR2 And if that is indeed your truck in the pic then yes it would have come from the factory with larger tires, a wider and taller stance and fender flares along some other small differences.

 

But, not all 2 doors are zr2 it will say ZR2 on the sticker in the glove box, in the fender well and on the plate on the firewall. Non zr2 Blazers came with 235s

 

All other Blazers where i have looked at the tire size have 235/70-15 so that is why i wondered why my car had wider tires written in the down in the vehicle registration

I have never noticed any ZR2 when looking to buy a cheap old Blazer

I reacted to the fact that the car have more ground clearance than other Blazers and also have 31x10.50R15LT tires and also the fact that the car have the tire size 31x10.50R15LT written in the vehicle registration
But i thought the wide tire dimension was something the previous owner had got written down in the vehicle registration

But when i checked the drivers side door tag and the tire dim is 31x10.50R15LT origan i knew that there had to be some kind of difference on the Blazer S10 models

So when i had a look at the tag in the glove compartment it reads ZR2

This is good do know because if i need any parts for the suspenson there might be a difference from what i read about the ZR2 cars

I am sure that the previous owner had no idea that the Blazer was an ZR2

 

Yes, parts are different. you also have 3.73 gears front and back, g80 rear locker. 8.5 inch rear end. I believe the transmission is slightly beefed up also. Stock s10 have smaller rear ends, most are non g80 and 3.43 gears