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Old 01-13-2014, 01:26 PM   #1
Join Date: Aug 2013
Location: Northern VA
Posts: 198
Front diff ring and pinion issues

This is the second time this has happened within the last 3 months.

4.0 engine
Dana 30 front
35" tires
4.56 gears
Upgraded Yukon axle shafts and ring and pinion (same material, not chromoly)
Installed by a reputable transmission shop so I'd hesitate in saying they didn't know what they were doing when they installed it.

I understand that I'm running what is considered the max tire, however, with the upgraded axle shafts and ring and pinion working in conjunction with each other I'm a little shocked that it happened again. Also, the shop mentioned that having the auto locker in there adds a good amount of stress to the front diff. Is this true? Enough to be catastrophic?

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Old 01-13-2014, 02:06 PM   #2
freeskier's Avatar
Join Date: Mar 2011
Location: Longmont, CO
Posts: 2,827
Yikes! What exactly are you doing when this happens? I would strongly suspect the gear install. Maybe it's time to upgrade to a high pinion D30 and have a different shop do the install...

CU Boulder Aerospace Engineering
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Old 01-13-2014, 02:11 PM   #3
Join Date: Aug 2013
Location: Northern VA
Posts: 198
I'm having a different shop do it this time around. I was attempting to get out of a V shaped "creek" and when going back up and out of the creek the front tires were spinning and trying to get traction. Then "pop, pop, pop, pop". Sounds bad, but I assure you it wasn't anything to the point where you'd think this kind of damage would happen.
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Old 01-13-2014, 04:21 PM   #4
hosejockey61's Avatar
Join Date: Oct 2012
Location: Aurora, CO
Posts: 2,966
Do you have a pic that shows the whole pumpkin from straight on? Just curious what everything else looks like...
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Old 01-13-2014, 04:29 PM   #5
Tjkid8's Avatar
Join Date: Dec 2012
Posts: 33
Looks like gear install wrong maybe back lash was too great looks like pinion was too far away but 35" on a dana 30 35 is pushing those axles to the max
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Old 01-13-2014, 07:12 PM   #6
elite56's Avatar
Join Date: Feb 2013
Location: Jacksonville, Fl
Posts: 825
Why does it look like the inside of your diff is full of dirty water?

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