i have a 2007 jeep wrangler unlimited Sahara, i wanted to purchase a arb differential cover in red but i dont know what gear ration i have so it fits properly. Does anyone know what stock Dana "?" my jeep comes with dont think the gears were ever changed eventhough i purchased it with a 4'' lift and 35'' tires.

 

There is a good chance the Jeep has been re-geared.

If you want to know for sure, and remove all doubt, do this:

Chock the front tires, fore and aft.
Put the transmission in neutral.
Emergency brake off.
Jack the left rear tire off the ground.
Put a jack stand under the frame, just in case the jack fails (had to add this).
Put an index mark on the aft end of the drive shaft, visible from the left rear wheel.
Put an index mark on the left rear tire at the 6 o'clock position.
Rotate the left rear tire 2 complete revolutions while counting how many times the index mark on the drive shaft passes its original position.
That number will be your axle ratio.
Remove jack stand and lower jack.
Put transmission in gear or Park, apply emergency brake.
Remove chocks.
If you have limited slip, jack up both rear wheels and rotate one revolution, making sure both tires rotate equally.

If the drive shaft rotated almost 3¼ turns, you have 3.21
If the drive shaft rotated almost 3¾ turns, you have 3.73
If the drive shaft rotated a little over 4 turns, you have 4.10
If the drive shaft rotated 4½ turns, you have 4.56
If the drive shaft rotated a little under 5 turns, you have 4.88
If the drive shaft rotated a little over 5 turns, you have 5.13

 

Unless it's a Rubi you should have a Dana 44 in the rear and a Dana 30 in the front. Rubi's have Dana 44's both front and rear.

 

Some '07s came with a Dana 35 in the back.

 

Ah, I stand corrected, I have an 09.

 

My 08 Sahara has a Dana 44 and 3.73 gears. Not sure if this was standard as I bought mine used and it had the tow package option and I wasn't sure if this package included a gear change.

 

You should have a 30 in the front and 44 in the rear. Pics of the diff should show that. (some had a 35 in the rear)

Wow, there were no posts when I wrote this...

 

If you meant "gear ratio", that doesn't matter when purchasing a cover. Only the housing number/style matters. ie; 30,35,44 etc.

 

X2. Should be a 30 in the front and 44 in the rear. Since yours us an 07 make sure it doesn't have a 35 in the rear, although I'm pretty sure all the Saharas had 44's.