CJ5 Dana 30 compared to YJ Dana 30

[tinhorn]

Are the ring and pinion interchangeable?

I found out that my CJ5 differentials are 4.27 and I'd like a taller ratio for street use. Figured I'd find a complete set of axles to swap, but ran across a 3.07 ring and pinion for the Dana 30 out of a YJ. (I can buy a new ring and pinion in the same ratio for the Dana 44 .)

 

[CJ]

I'm a little confused by your post. Is the 3.07 a swap out including the carrier?

IMHO - changing 4.27 is kinda out there... 4.27 is a great intermediate gear.

 

[tinhorn]

My goal is to stay ON the street--particularly in snow and ice. My last two 4x4s (non-Jeep) revved at 3000 rpm at 60 mph. With 4.27s my CJ5 would do the same.

With taller gearing I could keep the revs down.

 

[Old Dog]

I'm not a yj guy so I'm not sure if the yj had a high pinion 30 or not.
If it is a high pinion than no it won't work, if it's a low pinion 30 I THINK the gears should work.
One thing for sure is you will need new carriers for both the front and rear.
You can look up a gear set for the cj and the yj and see if it's the same part number to know for sure.

 

[1986cj7]

Are the ring and pinion interchangeable?

I found out that my CJ5 differentials are 4.27 and I'd like a taller ratio for street use. Figured I'd find a complete set of axles to swap, but ran across a 3.07 ring and pinion for the Dana 30 out of a YJ. (I can buy a new ring and pinion in the same ratio for the Dana 44.)

Check this chart out not knowing the size of tires you have, in my opinion 3.55 or 3.54 still use the same carrier as your 4.27 and will have a good power band range. I belive the chart is at 65mph. Here also is a gear calculator from a differant thread.Gear Ratio Calculator
The full thread can be read type in changeing gear ratio in the advanched google shreach box at top of page. Or use linkhttp://www.jeep-cj.com/forums/f2/changing-gear-ratio-15534/?highlight=gear+ratio+rpm+chart

 

[Old Dog]

the carrier break for a Dana 44 is 3:73/3:92 and the 30 is 3:54/3:73

 

[1986cj7]

the carrier break for a D44 is 3:73/3:92 and the 30 is 3:54/3:73

OPPS I was thinking the AMC20 for some reason. Which the 3.07 and up use the same carrier. Sorry for the brain fart.

 

[CJim7]

No. The YJ Dana 30 is a reverse cut (high pinion) gearset. All CJ Dana 30 's are standard cut.

 

[tinhorn]

the carrier break for a D44 is 3:73/3:92 and the 30 is 3:54/3:73

So I need new carriers. Like this one I presume: Dana 44 Diff Case Standard 3 07 to 3 73 Ratios 706020X | eBay

How many possible variations of carriers are there? Do I need to worry about axle spline count, width, or anything else, or is this a bolt-together proposition?

 

[tinhorn]

No. The YJ D30 is a reverse cut (high pinion) gearset. All CJ D30's are standard cut.

Aha. I posted above before I saw your response. Okay, so I throw this onto the bad-idea pile and go to work on swapping on a newer windshield. (Meanwhile I'll keep an eye out for complete axles with 3.73s.) Thanks.