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Front Differential Rebuild

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andyj6965
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Joined: 24 Jun 2008
Location: Minneapolis/St. Paul Area

PostPosted: Wed Jun 25, 2008 9:22 pm    Post subject: Front Differential Rebuild Reply with quote

I need to rebuild my front diff. I've got a 96 GC Ltd w/5.2, I believe front diff is a DANA 30, but not sure. What should I look out for? Where is a good how-to on this? I have Haynes manual. I'm pretty sure the pinion bearing is the culprit, but while I'm there should I replace the carriers as well?

Any advice would be greatly appreciated.

Andy
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Thu Jun 26, 2008 4:30 pm    Post subject: Reply with quote

rebuilt a diff before ? have a dial indicator ?

its a dana 30 , not sure if its hi pinion or low pinion axle in that year , if its a low pinion i would just pick up a high pinion from a junk yard for 100$ . i threw one away because no one would buy it .
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andyj6965
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Joined: 24 Jun 2008
Location: Minneapolis/St. Paul Area

PostPosted: Thu Jun 26, 2008 5:25 pm    Post subject: Reply with quote

Brad The Best wrote:
rebuilt a diff before ? have a dial indicator ?

its a dana 30 , not sure if its hi pinion or low pinion axle in that year , if its a low pinion i would just pick up a high pinion from a junk yard for 100$ . i threw one away because no one would buy it .


How can I tell if it's a hi or lo pinion? What's the difference? No, I haven't rebuilt one before. And I don't have dial indicator. Thanks, Andy
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swamp boy
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Joined: 01 Jan 2004
Location: New Orleans LA.

PostPosted: Sat Jun 28, 2008 7:10 pm    Post subject: Reply with quote

Grands all have low pinion... So you do not have HP unless someone put it in..

Now.. Onward.. Rebuilding a diff is not very hard but it requires special tools.. You will need a very big torque wrench and an inch pound torque wrench and a dial indicator..

But Brad is right.. Its much easier to find a HP 30 in a bone yard and swap it in.. Just get one the same gear ratio and bolt it up..


To tell if its HP or LP you just look at it.. The HP 30 input is above the axle tubes the LP is below them.. The gears inside are different for obvious reasons.. The Low pinion gears are standard cut because the pinion hits the bottom of the ring gear.. On the High pinion the gears are reverse cut because the pinion hits the gear above the centerline so it splines in differently.

The HP gear is 30% stronger because the teeth of the ring and pinion mate and pull instead of the LP where the pinion pushes the ring gear around ...
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andyj6965
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Joined: 24 Jun 2008
Location: Minneapolis/St. Paul Area

PostPosted: Mon Jun 30, 2008 1:10 pm    Post subject: Reply with quote

Thanks for the input. Just so I'm clear here... To go to a HP diff is it a complete axle swap? Do I need to swap front drive shaft as well? Andy
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swamp boy
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PostPosted: Wed Jul 02, 2008 9:37 pm    Post subject: Reply with quote

No driveshaft should work.

Yes its a complete assembly swap but its as simple as dropping the 4 control arms off the diff and unbolting the brake lines and driveshaft

Of course you want to jack the jeep up so there is no pressure on the springs .. (or get some spring compressors)

ITs really not hard at all...I can do it in about an hour..

In fact I have the rear 8.8 swap down to under 3 hours.. Mr. Green
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andyj6965
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PostPosted: Wed Jul 02, 2008 9:54 pm    Post subject: Reply with quote

Thanks. Can I use the same axle shafts?

Andy
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swamp boy
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PostPosted: Fri Jul 04, 2008 11:25 am    Post subject: Reply with quote

yes shafts will work.. (I would keep them as spares no matter what..)
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andyj6965
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PostPosted: Wed Jul 09, 2008 8:46 pm    Post subject: Reply with quote

One more question... My Grand has ABS. Can I use the ABS hubs from my old axle? or Do I need to get a Cherokee axle that has ABS? - Andy
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swamp boy
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PostPosted: Fri Jul 11, 2008 7:13 am    Post subject: Reply with quote

You can swap out the knuckles to get the ABS on the new axle but I wouldnt bother.. The ABS is problematic anyway...
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andyj6965
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PostPosted: Mon Jul 14, 2008 3:04 pm    Post subject: Reply with quote

I'm having difficulty finding an HP axle locally. What years can I use?

Oh, BTW, I was wrong about gear ratio (the tag was missing off the front). These are 3.73 gears. I had some extra time sunday and changed my rear diff oil (the tag on the rear said 3.73) and I counted the ring and pinion, did the math to double check.
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swamp boy
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PostPosted: Tue Jul 15, 2008 8:13 pm    Post subject: Reply with quote

Any Cherokee newer than 89(I think) and older than 2000 (pretty sure...)

What you are looking for is one without a Vacuum disconnect.. Its a big block of metal on the passenger side of the diff..

The newer XJ's 2000 and up have Low pinion ..

that gives you about an 11 year range of Vehicles to look for.. It shouldnt be that hard.. Dont give up... Mr. Green
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andyj6965
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PostPosted: Wed Jul 16, 2008 12:14 pm    Post subject: Reply with quote

I'm checking out a couple of u-pull yards tomorrow... If it takes much longer to find. can I disconnect the drive shaft and drive it for very long without damaging the 249 transfer case?
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Orangeamc13
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Joined: 20 Feb 2006
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PostPosted: Wed Jul 16, 2008 7:06 pm    Post subject: Reply with quote

You may have trouble finding a HP 30 with 3.73's in it. But, they are out there! Wink
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swamp boy
Cherokee Muderator
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Joined: 01 Jan 2004
Location: New Orleans LA.

PostPosted: Wed Jul 16, 2008 10:13 pm    Post subject: Reply with quote

Nope.. You will begin to damage the 249 right away.. They are not designed to be driven without either shaft.. I pulled my front once and drove home cause I shattered my ring and pinion. It was barely able to climb hills and reved to the sky at every redlight..

Others have said that they have done it.. It did not work for me.. And the trip home completely destroyed my VC ..
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