i have a 1985 s10 blazer tahoe and would like to to wut gears in in the rear end it also has the 2.8 v6 thx

 

You'll need to find your RPO code list. Once you decode the list, it'll tell you every regular production option installed on your vehicle. It should be located on the inside of your glovebox door. Run a search on RPO codes for a link to various decoders.

 

well i looked in the glovebox and every were else and no list so i have no clue now any other ideas

 

Hmm... Well, other option would be to open up the rear diff and either count the teeth on the ring and pinion or the ratio may possibly be stamped on the ring gear... If there is still any tags on the rear axle, you may be able to get the info from there as well, but I doubt that any of the factory identification tags would still be there...

One other possibility is to jack up the rear end and put the transmission in neutral. Mark one of the cups on the u-joint and put a mark on the front of the diff housing. Then count how many turns of the driveshaft it takes to spin the tires 1 full turn (provided that both tires are spinning). 3.42 gears will require that the driveshaft spin 3.42 times for 1 revolution of the tires. 3.73 ratio == 3.73 turns of the driveshaft. You get the picture.

 

I had GM run my vin (85 s10 blazer 2dr 4x4 2.8 auto) and has 4.11's. When I had the rear diff cover off I was able to confirm that by counting the teeth. Just ask a GM parts guy to run your vin and see what it came with.

 

ight thx i will def be checkin for the tags and stuff this weekend now its only 18 degrees outside and my brothers charger is in the garage

 

ok yea i could do that 2 my neighbor works for gm thx