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Unread 10-19-2013, 01:49 PM   #1
ryann04
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3.0L CRD - Dana 44 - 12_bolt Differential - HELP

Looking for some literature to rebuild my rear end.

Ran out of oil in my rear differential on the highway, heard a clunk, then whining/grinding noise.

Limped vehicle home, smoking out of the rear end (pulled the diff plug to see). Looks like I have to rebuild it.

Its a 12 bolts = QDII 8.25 rear end on a '08 Jeep Grand Cherokee CRD. (12-bolt diff)

looking for a "walk-through/DIY" for a rebuild on my rear diff.

...Also wondering if there should be any upgrades done at this time? Or OEM is sufficient.

Any help would be great.

Thanks,

Ryan Hansen

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Unread 10-19-2013, 04:41 PM   #2
Valpacer
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Might want to check your rear diff type, i think you will find its a 8.25 ELSD, not a D44. If it needs new bearings etc it will also need new shims etc which are a pain as there are hundreds of different thicknesses and only available from Jeep.
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Unread 10-19-2013, 06:37 PM   #3
ryann04
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my mistake, your correct:
12 bolts = QDII 8.25

Not sure if MODS could correct the title to this thread now or not? It should rear QDII 8.25, not dana 44
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Unread 10-19-2013, 07:35 PM   #4
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I'd personaly ask for the cost of hole diff assembly ... Also there are shops specialised in fixing trany and diff. I wouldn't look at individual parts in this case.
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Unread 10-19-2013, 09:27 PM   #5
fishinbama
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I will save you some money and recommend you get a nice used one from a junkyard. Put it in yourself. I got mine from LKQ.
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Unread 10-19-2013, 09:29 PM   #6
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Btw, Any year model WK 8.25 will fit but the later ones had better cases. Early ones had a mass vibration damper to compensate for the thin cases. Later ones were just built beefy enough that it isn't necessary.
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Unread 10-20-2013, 08:24 PM   #7
ryann04
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Quote:
Originally Posted by fishinbama View Post
Btw, Any year model WK 8.25 will fit but the later ones had better cases. Early ones had a mass vibration damper to compensate for the thin cases. Later ones were just built beefy enough that it isn't necessary.
any idea what gear ratio the 3.0l crd qdII are?
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Unread 10-20-2013, 08:40 PM   #8
sickchilly
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Quote:
Originally Posted by ryann04 View Post
any idea what gear ratio the 3.0l crd qdii are?
3.73
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Unread 10-20-2013, 11:02 PM   #9
TangoTango
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the pinion probably needs to be replaced also. tools.. a good backlash gauge; large pry bar; soft hammer; good micrometer and caliper; plus the basic tools.

you'll need to find out if the bearings are press fitted?

gears are easy to do if you do them right. just remember when measuring shims together 2 +2 does not always = 4. i.e a 0.023 shim plus a 0.077 shim maybe = 0.102 not the 0.100 you would think.

rear u-joint may need to be replaced too
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Unread 10-21-2013, 09:36 AM   #10
ryann04
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Perfect! thanks for all the information!

I will hear back (hopefully today) if the 3rd party warranty I got with the vehicle will cover this. They should, but being a 3rd party warranty place, they will try anything to get out of covering it. If they don't cover it, I will give it a shot myself and see what I can do, I am mechanically inclined, just never done a rear differential before.

If I do this myself, I will take lots of pictures of the process and document the procedure, and hopefully sticky it as a DIY to hopefully help someone else.

Anyone have any thoughts on going OEM vs After-market for parts on the rear differential rebuild?
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Unread 10-21-2013, 01:17 PM   #11
ryann04
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It's official, the 3rd party warranty company will not cover the damages.

They say because it "ran out of oil" that is a consumers responsibility and they will not cover it.

The dealer quoted $5000 to fix the problem. I am going to give this one a shot myself due to not wanting to pay high-dealership prices.

The dealer also said something regarding the ELSD might have to replace a hydraulic pump as well? Can anyone chime in on this?
So far I am looking at replacing all my bearings, the ring and pinion seem to be "OK".
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Unread 10-21-2013, 01:59 PM   #12
ryann04
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Looking into purchasing a rear axle assembly used.
$1750 - shipped - 42000kms

Just to clairify, mine is a 3.73 gearing with the ELSD? How can I confirm?
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Unread 10-21-2013, 03:18 PM   #13
ryann04
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just an update.. found some literature to clairify, hopefully this helps other in the future:

Differential Type 3: Electronic Limited Slip Differentials (ELSD) (C213RE)
Availability: Standard with 5.7-liter engine, Optional with 4.7-liter engine, Optional on 4 x 4 models with NV245 Transfer Case (Quadra-Drive II)
Ring Gear Diameter: 8.3 in. (213mm)
Axle Ratios: 3.73:1
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Unread 10-21-2013, 08:41 PM   #14
TangoTango
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I think you will be at least $1000 in parts if you do it yourself. Go add up the parts and cross check.
your numbers may vary.. but figure $1000 = $600 rear end; $100 bearings; $100 gears; $50 u-joint; $100 shims, $50 oil and brake parts. adds up fast.
Then you'll need the backlash tool (which maybe you can borrow).



Neg. on the axel.. they don't sell fast. maybe offer them 1k and see?
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Unread 10-21-2013, 08:53 PM   #15
TangoTango
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I should add... don't think setting up gears is easy even when you know what you're doing. Sometimes things all work together just right.. and then it is a no-brainer. Other times you're 6 to 8 times pulling fitting, measuring and re-pressing bearings and gears. I've put new gears in sometimes 45 minutes.. and others 3 days. Just FYI.
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