Need to know rear end ring gear size and axle ratio for 2002 chevy blazer ls 4door 4wd 4.3l v6 vin# 1GNDT13W32K174500 NOT zR2

SOURCE: gear ratio

There are two different ratios for a S10 Blazer,a 3.42(GU6) and a 3.08(GU4).Look in your glove box for a GM option codes.Look for a GU6 or GU4 code for the type of ratio you have.Hope this helps.

SOURCE: rear end gear ratio

you can count the teeth on the ring gear and divide that # by the tooth count on the pinion. An example is: ring gear 100, pinion 10 ...100divided by 10 is 10, expressed as 10 to one. (fake #) your diff is likely a 3 series such as 3.23 to 1. or a four series such as 4.11 to 1. If you have four wheel drive it is critical to match exactly. if not you can get better performance by changing ratio to something that better fits your needs. 4 series pull loads well, 3 series are better on fuel.(depending upon terrain)

SOURCE: rear end (axle)

call jeep and give them last 9 digits of your vin and ask for three things -Differential Type,Gear ratio, and Track lock- They will give you
1) Dana 35 or 44
2) Gear Ratio 3.31 or 3.73
3) Track Lock - yes/no

SOURCE: how to remove rear door panel on 2002 chevy blazer

usually two screws one at the armrest and one under the power window console , this console usually pops out to let you at the screw.

SOURCE: where do I find the gear ratio for the rear diff

Lower down this page is a chart with RPO codes, which can potentially be found inside the glove box...
The codes pertain to the transfer case, the front differential, and the rear differential, so it may take a bit of snooping.

http://www.drivetrain.com/parts_catalog/ring_and_pinions/what_gear_ratio_do_i_have_in_my_gm_or_chevrolet.html


However, if you were merely looking for the driving-gear-ratios, here's a page containing that kind of information for a 2000 4wd ls blazer:

http://www.vehix.com/inventory/Details.aspx?inventoryid=770000019DDD0C