(D30) new ring gear bolts won't fit into new ring gear - JeepForum.com
 
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post #1 of 15 Old 01-08-2008, 01:47 AM Thread Starter
sportcoupe
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(D30) new ring gear bolts won't fit into new ring gear

I bought new ring and pinion gears for my dana 30 in my '97 Wrangler. I also bought a master re-build kit as well for the new bearings, etc...

The new ring gear bolts in the rebuild kit are too large thread for the new ring gear. They will not thread in to the ring gear at all. I have not opened up my Dana 30 yet as I am still driving it. I was just trying to install the ring gear to my new Detroit Truetrac in advance.

Here's the parts I ordered. One of them must be wrong for my application. Which one is the incorrect item?

Ring & Pinion
Motive Gear part number D30-456TJ

Master rebuild kit
Ratech Mfg part number 364K

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post #2 of 15 Old 01-08-2008, 06:18 AM
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Do the ring gear bolts thread in to the True Trac?
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post #3 of 15 Old 01-08-2008, 07:54 AM Thread Starter
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Ah, good point. No, the truetrac isn't threaded but the ring gear bolts do fit very nicely in the carrier. If the bolts were smaller to match the ring gear they would be undersized for the carrier allowing too much movement.

I checked the bolt and hole sizes. The bolts with the rebuild kit are 7/16x20 left hand thread. The bolt holes in the ring gear are metric 10mm but I didn't have the correct thread pitch tap on hand to an exact size. Also the ring gear bolt holes are standard right hand thread. Major differances.

I am leaning on the Motive gearset to be wrong. They list 3 differant part numbers for 4:56 ring/pinion sets for the dana 30.

D30-456
D30-456F
D30-456TJ

I "assumed" I needed the "TJ" part number since that is the wrangler I have.
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post #4 of 15 Old 01-08-2008, 08:01 AM
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FWIW, I can not recall either of my diffs (D30 or D44 rear) having left hand thread ring gear bolts. I've had mine apart a couple of times.....while my memory isn't as good as it use to be , I'm pretty sure I would remember that little detail had I come across it.

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post #5 of 15 Old 01-08-2008, 08:06 AM
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Stu is correct - no left hand thread ring gear bolts in a D30.

Your TJ D30 should have 3/8" right hand thread ring gear bolts.

Jeep did switch from 3/8 to 7/16" ring gear bolts on later model TJs, but I thought this change was only with the D35 and the D44, not the D30.

So if I understand correctly, your Detroit True Trac is for 7/16" ring gear bolts and the ring gear is for 3/8" bolts?

It sounds to me like you have some mislabeled parts.
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post #6 of 15 Old 01-08-2008, 08:44 AM Thread Starter
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I came from the GM side and left hand threads on ring gear bolts are normal. I had no idea dana's use regular threads.

I just went out to the garage and rechecked the ring gear holes, they are indeed 3/8x24 regular thread. The bolts from the kit are 7/16x20 left thread.

My truetrac has 7/16" holes for the bolts. If I have the correct ring gear then BOTH the truetrac AND the install kit are wrong. I checked the bearings from the kit on the casrrier and pinion. The bearings are way oversized! (if the truetrac is correct.

Detroit Truetrac part number 912A585
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post #7 of 15 Old 01-09-2008, 12:42 AM Thread Starter
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Update, found out the Ratech master kit marked 364K ('97+ TJ) was packaged with a master kit from a GM 8.5" 10 bolt judging by the included paper gasket, it's an exact match. So we have a mis-labeled box. They are shipping me another kit overnight.
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post #8 of 15 Old 01-09-2008, 06:07 AM
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Same Problem

Quote:
Originally Posted by Wheelin98TJ
Stu is correct - no left hand thread ring gear bolts in a D30.
Your TJ D30 should have 3/8" right hand thread ring gear bolts.
Jeep did switch from 3/8 to 7/16" ring gear bolts on later model TJs, but I thought this change was only with the D35 and the D44, not the D30.
So if I understand correctly, your Detroit True Trac is for 7/16" ring gear bolts and the ring gear is for 3/8" bolts? It sounds to me like you have some mislabeled parts.
I had this same problem several years ago when I put a Truetrac in my 2003 Dana 35. The holes in the Truetrac were too small. I drilled out the Truetrac to accept the larger bolts. This was an absolute bear since the Truetrac is hardened cast iron.
I called Truetrac about the problem and the guy there said, basically, tough ****, as they had heard about the bolt size change but had no plans to build Truetrac diffs with larger holes no matter what Jeep did with their bolt sizes.
I don't know how they stay in business with an attitude like that.
Thing is that you had better check the bolt sizes in your diff/ring gear before ordering a Truetrac.
Thanks.

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post #9 of 15 Old 01-09-2008, 06:48 AM
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Just a small delay. Glad it got worked out.

Got ignorance? Please see below.
Quote:
Originally Posted by kd4yor View Post
Chris, I just think your having buyers remorse for all the work in your 8.8 for no added gain (over the Dana 35).
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post #10 of 15 Old 01-09-2008, 08:18 AM Thread Starter
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Yes, small delays are expected with any jeep mod. I know this and don't get wound up about that fact.

Just one small thing is bugging me. If the bolt holes in the truetrac are all 7/16" diameter and the ring gear bolts are 3/8" isn't there a possibility of the ring gear slipping on the carrier?
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post #11 of 15 Old 01-09-2008, 08:27 AM
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I would definitely prefer an exact fit so then you're not just relying on the clamping force of the bolt.

I wonder why this True Trac is for 7/16" ring gear bolts?

I would say just get a different gear set with a ring gear that has threaded holes for 7/16" ring gear bolts, but I've never seen or heard of a D30 with 7/16" ring gear bolts.

You could always drill and tap new 7/16" holes in the ring gear, but that would be a PITA.

Maybe you could run sleeves in the True Trac?

Have you spoke with the gear vendor or anyone from Eaton about this?
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post #12 of 15 Old 01-09-2008, 10:19 AM Thread Starter
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Do people normally sleeve the truetrac ring gear bolt holes when installing it in the dana 30 using the smaller 3/8" ring gear bolts?

No, I have not talked to Eaton about this subject. I figured since so many truetracs are installed in TJ's someone has run into this question before here.
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post #13 of 15 Old 01-09-2008, 10:57 AM
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I recommend you call Brent at Eaton. He is very helpful and he worked with Detroit Locker before the buyout.

Here's the # for Eaton:

800-386-1911
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post #14 of 15 Old 08-21-2010, 01:00 PM
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bumping an oldie for a resolution...

anyone figure this problem out? I've got the same issue, both front and rear. Front is a 1999 XJ HP D30, rear is a 2004 TJ D44. Both TrueTrac's have 7/16" bolt holes, and both install kits and gears are 3/8". Those running TrueTrac's front and rear, how did you resolve it?


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post #15 of 15 Old 08-21-2010, 02:10 PM
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Don't remember if it was the front tt or the rear, but one of them came with sleeves for the ring gear bolts. The sleeves helped with the larger bolt hole size in the tt, though there was still more play than if the tt had just been drilled to a 3/8 hole.

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