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Discussion Starter · #1 ·
Hi Guys

Just visited my mechanic who is installing new ratio Rings & Pinions front and back for me to compensate for the oversize wheel/tyre package I have.

He asked me to make sure that the kit I have is definately correct as there is a big difference in the diameter of the Pinion gear head between the original and the new one which has a smaller head.

On the original shim configuration the Pinion and Ring gears were barely engaging and would slip even by hand turning the pinion.

After a few trial fitments he says the Ring is still not meshing deeply enough with the Pinion. He has shimmed the carrier as far over as it can. ie All the shims are now behind the bearing on the ring side.

He has also added a few more shims to the pinion depth so that the Ring is meeting the pinion at a wider point. The gears are now engaging ok but there is still far too much backlash and no space for additional shims on the carrier set up.

We could keep adding to the pinion depth shims to bring this forward, but he wanted me to check as there still seems quite a way to go.

My rear axle is a D44 with a Trac-Loc carrier. Originial ratio was 3.73 and we are fitting a 4.56 kit from G2 supplied by 4wheelparts.com

https://www.4wheelparts.com/Drivetr...px?t_c=12&t_s=237&t_pt=5092&t_pn=G/24-TJ2-456

Kit is for a D44 rear and D30 front and includes all the bearings and shims needed. Pinion and bearings fit together well and the whole lot fits into the housing as it should.

So, long story short, I guess my question is.....
Would it be normal for a pinion with a higher ratio to have a smaller diameter gear head?
 

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Discussion Starter · #2 ·
Answering my own posts now. 1st sign of madness?

After some further research it looks like I got some duff information when buying the kit. I suspect the carrier break is my problem. looks like I need a different carrier.

Not to impressed as I checked this on 4wheelparts.com before ordering.
 

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Yep you need a new carrier for your Dana 44, it changes at 3.92.

And from what your mechanic said, I'm worried if he's competent. Of course the pinion gear head will be smaller in a 4.56 set than in a 3.73 set. The pinion shaft diameter is the same but the gear head itself will be smaller. Which is why the different carrier is needed... to position the ring gear closer to the lower ratio'd 4.56 smaller diameter pinion gear.

I always make it a point to have the installing shop provide ALL of the parts for a ring & pinion installation. That way their warranty will cover both the parts they provided and their labor as well, plus they are responsible for making sure all the parts are correct.
 

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This is a great example of why it is good idea for the installer to order all the parts he/she needs to do the job. That way if there is a problem/confusion...it's on him/her to resolve and make it right.

And often they can order the parts cheaper that what we can get them for. :)
 

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In addition to this situation being an example of why one should have the shop order the parts, it is also a prime example of why one should use a gear and axle shop for gear work rather than one's regular mechanic.

Someone experienced with gear changes in Jeep axles would have already known that a different carrier is required for 4.56 gears and wouldn't have wasted time moving shims around, which in itself suggests to me that he knows just enough about differentials to be dangerous.
 

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Discussion Starter · #6 ·
Thanks for the input guys.

All good advice but unfortunately I live in Ireland not the West Coast of USA. There are no Axle & Gear specialists here. That is why I chose an experienced Mechanic that has done diff work before albeit not on Jeeps.

There is no supply chain for the parts either which is why I shopped around in America.
I chose to buy the kit from 4wheelparts as it said 3 times on the webpage that it included everything required and no additional parts were needed.

It gave me even more confidence because in the Q&A section for that item someone had previously asked if the kit worked with a D44 3.73 carrier to which the response was Yes. I now know this is wrong information unless they are providing a thicker ring, a spacer plate or a different carrier.

I have emailed them but no reply as yet.
 

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Discussion Starter · #8 ·
Thanks Jerry. Checked that link but that company doesnt ship internationally however I used the part number on there to find other companies that do.

Will be going this route if 4wheelparts dont provide a solution in the next 24hrs.
 
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