How do i know what rear end gear ratio my s10 blazer haS?

 

You need to check your RPO codes in your glove box... Or take your diff apart and hope it's stamped on the ring gear...

Or, you can make a line on your tire, and the pavement, and one on your driveshaft and differential, and move one rotation of the tire, while a friend counts how many times the driveshaft goes around... and that'll give you a rough estimate, since, unless someone changed it to a custom ratio, you'll have:

3.08
3.42
3.73

There might be others but I can't remember what else the S-series got... Also, year, model, and trim level might help... 4x4 or non 4x4...

 

I think they also came with 4.10 gears but not sure, I believe the most popular were the 3.42 and 3.73.

-Lenny

 

I think the only S-Series that got the 4.10 was the Sonoma GT

 

Since *search* is such an overlooked feature here, I did the work for ya (that is what you wanted right?)...[&o]

With 'ratio' as the search criteria, I found quite a few hits. Here's one that runs through what you asked for: gear ratio's

 

And here's a link with all the codes, & the meanings.

http://www.automotiveforums.com/vbul...d.php?t=450285

 

Gonna havea little fun digging through that RPO list... It seems to cover all GM vehicles, lol.

Here is an S-Series specific RPO Decoder