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Old 03-09-2012, 02:23 PM   #1
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TrueTrac in D30 Installation Question

Am considering putting the Detroit TrueTrac in the D30 front of my 09 JKUS; already have the OEM TracLoc in the rear. I read recently that there may be some installation problems regarding ring gear bolt sizes. Other post said that in late 07 Jeep switched from 7/16'"to 1/2" ring gear bolts but the TrueTrac is only drilled for either 3/8" or 7/16" bolts and need to be drilled/tapped to 1/2". Apparently this may be difficult to do for some installation shops as the TruTrac case is very hard. Anyone with their experiences with this potential problem? I would hate to have someone get started on this and then have everything delayed waiting for s specialty shop to mod the TrueTrac casing.

PS - I have no compelling need to either regear or switch to a selectable locker so save those suggestions.

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Old 03-09-2012, 02:29 PM   #2
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What you are speaking of is for the rear differential . Not the front differential. I too am going to install a truetrac in the front.

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Old 04-04-2012, 06:48 PM   #3
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Quote:
Originally Posted by G-Mike View Post
Am considering putting the Detroit TrueTrac in the D30 front of my 09 JKUS; already have the OEM TracLoc in the rear. I read recently that there may be some installation problems regarding ring gear bolt sizes. Other post said that in late 07 Jeep switched from 7/16'"to 1/2" ring gear bolts but the TrueTrac is only drilled for either 3/8" or 7/16" bolts and need to be drilled/tapped to 1/2". Apparently this may be difficult to do for some installation shops as the TruTrac case is very hard. Anyone with their experiences with this potential problem? I would hate to have someone get started on this and then have everything delayed waiting for s specialty shop to mod the TrueTrac casing.

PS - I have no compelling need to either regear or switch to a selectable locker so save those suggestions.
This is true for the stock ring on the D44 and I think it is for the D30 as well. After market rings are dual drilled and bolt right on. I've heard machine shops are the way to get those holes bored out since the Truetracs case is so incredibly hard.

Call Jeff @justdifferentials.com he'll probably know.
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Old 04-05-2012, 05:22 AM   #4
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I just had a TrueTrac installed in my Dana 30, but had gears put in also. I would call Eaton and ask them. That's what I would do.
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Old 04-05-2012, 10:28 AM   #5
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I have contacted Eaton. Both by phone and email. Waiting for a reply.
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Old 04-06-2012, 03:34 AM   #6
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I've emailed Eaton 2 or 3 times in the past and never got any response. I have heard of people getting someone on the phone after waiting on hold until they got through, like over an hour or something. That's pretty much why I suggested someone who works with differentials all day and picks up on the first few rings. Good luck.
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Old 04-06-2012, 06:16 AM   #7
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Why go with the Truetrac up front? I understand them in the rear but if I was going as far as this mod, I would go ahead and spend a few extra bucks for the Eaton E-Locker up front. A much better investment IMO
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Old 04-07-2012, 06:22 PM   #8
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Ok hopefully this will clear up everything about aftermarket traction devices.

First of all, eaton was very quick to get back with me via phone. They didn't have a whole lot of info though. None of their lockers/limited slips are drilled for the 1/2" ring gear bolts our Dana 44s have with Chrysler gears. He also stated that it would be extremely difficult to drill the truetrac as the Rockwell hardness is a 58-60. He didn't have much info on the Dana 30. So...

I have a set of 3.73 gears off a 2011 sitting in my garage so I decided to compare the front and rear bolt openings.

The Dana 30 is drilled for 3/8 or 7/16" and the 44 is 1/2". They were visibly different.

There should be no problem installing any traction device in the front at all.

Hope this helps.
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Old 04-07-2012, 07:01 PM   #9
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Folks love to jump clean past the TrueTrac to get to a full time locker, but in my experience the TrueTrac in the front pig can take you more places than people would give it credit for.
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Old 04-07-2012, 07:18 PM   #10
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TrueTracs front and rear have been my plan for awhile now, and I've never heard a convincing reason to change it given that I'm not terribly interested in rock crawling. Trails and the occasional bit of wintery weather are all I ever use 4wd for, and I think two TrueTracs would be perfect for that.
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Old 04-07-2012, 07:51 PM   #11
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The voice of reason. Not everyone is going to run the Rubicon trail on a daily basis. If my Traclok goes south, I will put another TrueTrac in the rear.

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TrueTracs front and rear have been my plan for awhile now, and I've never heard a convincing reason to change it given that I'm not terribly interested in rock crawling. Trails and the occasional bit of wintery weather are all I ever use 4wd for, and I think two TrueTracs would be perfect for that.
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Old 04-07-2012, 09:57 PM   #12
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And being an all gear LSD, the Truetrac has no clutch plates to wear out.
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Old 04-08-2012, 07:56 AM   #13
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Originally Posted by rics1997
Why go with the Truetrac up front? I understand them in the rear but if I was going as far as this mod, I would go ahead and spend a few extra bucks for the Eaton E-Locker up front. A much better investment IMO
Few extra bucks? How bout over 500 including wiring in the locker part.
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Old 04-09-2012, 05:23 AM   #14
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Why go with the Truetrac up front? I understand them in the rear but if I was going as far as this mod, I would go ahead and spend a few extra bucks for the Eaton E-Locker up front. A much better investment IMO
It seems to me that locking the front with a D30 on this 5000 lb vehicle is just a recipe for breakage. For a DD / weekend warrior TT front and rear is an almost unstoppable combination if you are not doing a lot of tire lifting. This has nothing to do with money or anything else, it's what works for me and the terrain I drive.

I have heard the Eaton E-Locker for the D30 is an excellent unit, I just prefer having something there full time that's not so harsh on the turdy.
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Old 04-09-2012, 05:45 AM   #15
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Absolutely. Put a TrueTrac in the front of 90% of the Jeeps who take their rigs down a logging road (etc) and everyone will swear you are fully locked.


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It seems to me that locking the front with a D30 on this 5000 lb vehicle is just a recipe for breakage. For a DD / weekend warrior TT front and rear is an almost unstoppable combination if you are not doing a lot of tire lifting. This has nothing to do with money or anything else, it's what works for me and the terrain I drive.

I have heard the Eaton E-Locker for the D30 is an excellent unit, I just prefer having something there full time that's not so harsh on the turdy.

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