i have a 90 v6 5spd 4x4. im wondering what gears i have in the rear. i have 30" tires and run 3,000 rpms at 70. any ideas?

 

sounds like 4.10 gears..

Look on your drivers side door sill for the axle code.

 

I Painted Over It...lol

 

The door jam sticker would have told you without a doubt. But doesn't 3000 RPM at 70 on 30" tires seem more like 4.56 gears? I had 4.10 gears on mine and I want to say on 30" tires my cruising RPMs were lower than that.

 

and i would think with the 3.0 the rpm would be lower too

 

The search engine on this site is a very powerful tool. This question has been asked and answered here many times. I've answered it three or four times myself. Here's a link to a recent thread that's got lots of info on how to check your ratio. Happy reading.

 

you shouldnt have painted over that!!! that is a ton of useful information on that door sill!

 

Why dont you try and rub off the paint with some paint thinner or somthing?

 

http://www.grimmjeeper.com/gears.html

you can use this site to help figure out which gears you have. couldnt 4.30s be a possibility too?

 

4.30 only came in automatics, so definetly not those.

I went to this site http://www.richmondgear.com/101032.html and typed in 70 mph/3000rpm/30"tire=3.83 gear ratio. No 3.83 ratio available. So, that don't jive.

Then I used the other one there, I put in 4.10/70mph/30"tire/.838 OD ratio= 2694rpm. So that don't jive either.

I put in 4.56, and it worked out to 2996rpm@70mph in OD(.838 ratio) with 30" tires.

So there you go. 4.56 That's how that works.