What is the gearing on a 1993 4.0 manual YJ???

[IcemanK2]

I don't have an owners manual and I have heard both 3.73 and 3.07. I would just like to know because I am about the purchase 33x12.50x15 BFG MT KM's and I want to make sure and buy the best gear ratio for my Jeep. Thanks.

[Lost_Knight]

Most likely 3.07. My YJ is a 94 and had 3.07s with the 4.0 and AX-15. Look at the tag on the diff and double check. :cool:

[Jerry Bransford]

Originally posted by Lost_Knight
Most likely 3.07. Ditto to that. The other possible ratio would be 3.55, not 3.73 which didn't come along until 1998. Look at the narrow steel tag bolted between two bolts at the 9 o'clock position on your rear axle's differential cover. The ratio will be embossed into it as either "307" or "355" since they tend to leave the decimal points off.

[Dev Dev 23]

I have 3.73, mine's a sahara and I don't know if that might have something to do with it(?). Check the diff. cover.
Devin

[aircraig]

At one time my 93 was a 3.73 rear changed it once now have to change A second time. There should be a tag on the rear telling what the gear ratio is.

[IcemanK2]

Where can I get some 3.73's cheap that will work for my setup?

[love24wheel]

My dads 93 4.0 ax-15 yj has 3.55's in it. My 89 yj HAD 3.55's in it, before I swapped them out for 4.56's
Scott

[Dev Dev 23]

Originally posted by Dev Dev 23
I have 3.73, mine's a sahara and I don't know if that might have something to do with it(?). Check the diff. cover.
Devin

Holy crap, major brain fart. I lied, I have 3.55s! Sorry 'bout that. :)

[Mascarab]

Mine had 3.07's until I swapped axles for 4.10s

[Joe Dillard]

This is a sure fire way to calculate your gear ratio:

Yes, you can look at your axle tag, but this method tells the true tale every time, zero room for question if done correctly. :)

Jack up one rear tire if you have an open diff, or both tires if you have a working posi or locking differential. Rotate (transmission is in neutral), the tire(s), one full revolution for posis and lockers and 2 full revolutions for open diffs. Carefully count the number of full revolutions the driveshaft makes. This is your gear ratio. In other words, if the drive shaft turns 3 ¾ turns (and you have a locker), you probably have a 3.73 gear ratio. Turning the tire for twice the number of full revolutions and dividing the drive shaft revolutions by two will give you a more accurate reading.

With a floor jack, this process takes ~1-2 minutes max.

[BFJ93YJ]

I have 3.55's right now in my '93. Hopefully that will change real soon!

[IcemanK2]

Would someone want to sell me there extra 3.55's real cheap?