Differential Findings.. - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 18 (permalink) Old 06-23-2011, 05:23 PM Thread Starter
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Differential Findings..

EDIT WITH FINDINGS FOR FUTURE SEARCHING: A Standard 8.25 rear diff for 29 spline axles works in the commander, verified and installed in mine.



There is so much conflicting info on the rears on our Jeeps, mine is starting to make some noise so I was going to put in a true-trac.

A know ARB lists the 8.25 air locker as fitting our vehicle, here is what Eaton sent me through their tech lines...

My Email:
I have a 2006 Jeep Commander. The rear end housing is a standard Chrysler 8.25, 29 spline axle. I would like to run a TrueTrac in the rear. The ring gear on the newer Chrysler products is a 213mm outer diameter, as opposed to the older 210mm outer diameter. Are the bolt patterns for the ring gear the same / can I use the standard 8.25" differential? The rear end is also a floater style, no C clips. I see no reason why you couldn't use the C clip style differential in a non c clip style rear, correct? Thanks for any insight, looking at part number 912A553. -Jared


Response:
Thank you for the interest in Eaton differentials. Actually, the axle is not the 8.25” old school style. It is a metric corporate rear that is completely different (aside from the ring and pinion being interchangeable). Unfortunately the differentials will not interchange between the two applications, which means that all traction aid options are dealer items only at this time


Just sharing some info...

2006 Jeep Commander 3.7l
KN CAI, Detroit TrueTrac, Homeported TB, HID Kit

Last edited by atljar; 07-13-2011 at 08:59 AM.
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post #2 of 18 (permalink) Old 06-23-2011, 06:54 PM
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so is what they are saying is no lockers will work for the rear?
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post #3 of 18 (permalink) Old 06-23-2011, 11:41 PM
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ford 9", problem fixed. Or a dana 60 swap. . .

silver '06 4.7l, leather, no sway bars, BFG A/T with MTR tread (TreadWright) 265/70/17, 1.5" spider trax, get lost 4x4 front bumper and rock sliders, custom lift (OME front springs with spacers, 2.25 RR in rear)
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post #4 of 18 (permalink) Old 06-24-2011, 11:42 PM Thread Starter
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Yes they are saying they dont make a locker/LSD for our rear.

ARB obviously disagrees as they list the one for the 8.25 as fitting the commander.

Anyone have a clue what a "metric corporate" rear is? The 8.25 (210mm) and 8.375(213mm) ring gears are interchangeable, same bolt patterns so our ring gear will bolt up to that diff. (similar to GM 7.5 and 7.675) If the gear sets are interchangeable, that also means the pinion placement as far as depth is the same, so you could get a good pattern. Diff bearing size or diff ring gear offset is the only thing I see which would change things?

Does anyone have any case measurements or a diff from a Commander they could measure a few things?

2006 Jeep Commander 3.7l
KN CAI, Detroit TrueTrac, Homeported TB, HID Kit
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post #5 of 18 (permalink) Old 06-25-2011, 02:05 AM Thread Starter
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Just crossed OEM jeep, to aftermarket, to old school 8.25. Pinion head and tail bearings, and diff bearings are all the same bearings. I think Eaton is wrong, I may just try and wing this...

2006 Jeep Commander 3.7l
KN CAI, Detroit TrueTrac, Homeported TB, HID Kit
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post #6 of 18 (permalink) Old 06-25-2011, 09:46 AM
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ARB has already fitted there locker to a XK without issue and it worked just fine. The Eaton guy obviously does not know what he is talking about because there also are no dealer lockers available for the XK. Now of course you realize were only talking about the QT2.


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post #7 of 18 (permalink) Old 07-12-2011, 11:50 PM Thread Starter
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Well, mark one up for Eaton being flat out wrong.

Purchased a true trac, installed today. No problems, cant wait to test it out.

2006 Jeep Commander 3.7l
KN CAI, Detroit TrueTrac, Homeported TB, HID Kit
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post #8 of 18 (permalink) Old 07-13-2011, 03:41 PM
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Quote:
Originally Posted by atljar View Post
Well, mark one up for Eaton being flat out wrong.

Purchased a true trac, installed today. No problems, cant wait to test it out.
Sweet! Let us know how it goes!

2006 XK Sport, 4.7l, QTII- many mods
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post #9 of 18 (permalink) Old 07-13-2011, 06:58 PM
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Yes please let us know how it works out for you the more options we have the better. The guy at eaton is not an expert and with a vehicle like ours with very little after market support he probably did a little internet search or asked someone before responding to you. I was in email contact with ARB about there locker and threw there test fit on an XK in which we have a thread on it.


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post #10 of 18 (permalink) Old 07-15-2011, 08:54 PM Thread Starter
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Join Date: Nov 2009
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Power-Train: 3.7L V-6
4WD
If 4WD - system: QT-I
Current Mileage: .
Posts: 30
Send a message via AIM to atljar
Initial impressions are great. No problems with stability control as some people suggested, took it out in a parking lot and swerved hard enough for it to engauge and seemed like it responded normally. Ill know for sure once winter hits.

Zero noise, zero chatter/binding when turning.

2006 Jeep Commander 3.7l
KN CAI, Detroit TrueTrac, Homeported TB, HID Kit
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