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Unread 01-11-2013, 05:59 PM   #1
mithuth
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Pro Rock 44 or ?? (03 TJ)

Current significant specs: 03 TJ, 4.75" total lift isntalled (3.5 Rock Krawler lift + 1.25 JKS BL), 35x11 TSLs, Ford 8.8 rear, 4.0L with SYE'd NP231.

I am totally sick of down time over broken ujoints and axle shafts. My Aussie locked, 3.73 geared D30 has seen it's last days under my TJ. The last time I blew a ujoint it took out a hefty portion if the lower axle C on the passenger side along with both inner and outter shaft ears. I've had enough of this axle. It's time to throw a real axle with a selectable locker up front. I've heard many people running up to a 37" tire with no problems on a D30, but I've honestly had enough.

I've got my eyes on a Pro Rock 44 with ARB locker, chromoly shafts, 4.56 gears and 1310 ujoints. I realize this is going to run me a pretty penny, but I am determined to put somethign under the front of this TJ that will NOT explode every trip into the woods that will handle 35" tires and my heavy footed driving style. I've looked at the Currie Rock Jock axles but I am not sure I can justify the cost.

Due to some big life changes, I no longer have a heated garage or welding equipment on tap. So grabbing a junkyard axle and rebuilding something myself is not possible right now. I really need something as a semi-quick drop in. Any recommendations besiders the Pro Rock 44 or recoomendations where to make the purchase besides 4wd.com?

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Unread 01-11-2013, 06:31 PM   #2
rchase559
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You will have the exact same u-joint.

What axle shafts and u-joints are you currently running?
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Unread 01-11-2013, 07:01 PM   #3
willis36
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The pro rock 44 uses jk internals, which has a slightly larger gearset, larger shafts and ujoints than a tj 44.
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Unread 01-11-2013, 07:30 PM   #4
Huey
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mithuth,

Try these guys: http://eastcoastgearsupply.com/. I have not ordered from them, however, I hear nothing but good things. Best of luck and please keep apprised of your process and decisions, as I am considering the same thing.
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Unread 01-11-2013, 07:51 PM   #5
rchase559
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Quote:
Originally Posted by willis36
The pro rock 44 uses jk internals, which has a slightly larger gearset, larger shafts and ujoints than a tj 44.
My apologies I wasn't aware Dynatrac was doing that now. How much bigger is the JK stuff? IIRC the ring gear is the same size 8.5" and the u joints have the same cap size.
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Unread 01-11-2013, 08:25 PM   #6
willis36
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here ya go
154_1004_04-new_mopar_jeep_axles-jk_-_tj.jpg   154_1004_07-new_mopar_jeep_axles-pinion_shafts.jpg  
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Unread 01-11-2013, 08:33 PM   #7
rda616
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Quote:
Originally Posted by rchase559 View Post

My apologies I wasn't aware Dynatrac was doing that now. How much bigger is the JK stuff? IIRC the ring gear is the same size 8.5" and the u joints have the same cap size.
The jk 44 has a 9" ring gear and the pinion shank is the same diameter is a Dana 60. Jantz makes a bearing kit to run it in a tj rear 44 though. It's to bad the tj dana 30/44 c's don't have enough room to clear those jk shafts too.
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Unread 01-11-2013, 08:34 PM   #8
BamaJeepman21
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I'm almost positive Dynatrac rates the ProRock 44 for running 37's easily. Don't quote me on that though...

This will be the axle I'll go with when I upgrade. I think tricked out it'll only run ~$4,000. Well worth it IMO.
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Unread 01-11-2013, 08:55 PM   #9
Hosejockey61
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Quote:
Originally Posted by BamaJeepman21 View Post
Don't quote me on that though...
...you know somebody had to do it...
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Unread 01-11-2013, 09:54 PM   #10
Ring611
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Good luck blew up my 30 for the last time as well. I know your pain.... Got a Chevy 6lug Dana 44 w/ detroit and 4.88 for 450 getting in Switched to driver side drop and narrowed to 60" with cromo shafts for 500 and Im looking at the T&T Waggy Truss for 600. Was looking at the Pro and Trail 44's but a couple guys i know in VA and IL run them and wish they would have just waited and built one especially after dumping 4K in an axle when (not all the time) you can find descent deals with just waiting and searcing good ole CL every day 1000 times. Again good luck!!
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Unread 01-11-2013, 10:15 PM   #11
OldGloryLJ
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Comparison specs from Dynatrac should clear up some of the confusion and misinformation:

http://www.dynatrac.com/pdfs/New_Gen...ison_chart.pdf
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Unread 01-11-2013, 11:56 PM   #12
oalali
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The pro rock 44 is stronger and you can get it with RCV axle shafts.

I have LP dana 44 with RCV and never had a problem. Touch wood !


But if you are paying all this amount, why not go with pro rock 60 instead ?
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Unread 01-12-2013, 10:31 AM   #13
wushaw
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X2^^^
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Unread 01-12-2013, 11:33 AM   #14
rjacobs
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The issue with these isnt the internals(to a point), its the small u-joints, the small inner C's, the ball joints, the unit bearings, and the knuckles.

How are you going to address this with the Dynatrac ProRock 44? Switch to full JK outer? 1 ton outers? Spinfree unit bearing replacement?

You says you want to run 1310 U-joints. What axle shaft setup uses 1310 U-Joints with a 30 spline internal and 27 spline external? RCV's are a better option I think.

Beefing up the center(which is a good idea, dont get me wrong) will only help accelerate breaking the small outer parts.

For a built Dynatrac ProRock 44 from Northridge you are at almost 5k and that is setup to use the D30 outers(although with RCV shafts). I think a full JK knuckles out setup(knuckles, unit bearings, brakes) is around $1500 so you are looking at 6500 for everything.

For $7500 you can get a Currie Rock Jock D60 front completely setup with full 1 ton inners, 1 ton knuckles, JK brakes, big *** u joints, etc... and that includes almost $1000 worth of Currie steering making the actual axle setup just about the same cost. You can also get manual hubs with the Currie unit.
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Unread 03-02-2015, 10:39 PM   #15
desertcrawler86
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I also have a tj with a prorock44 being built. Can you run Reids knuckles 30/44 with jk hub and brakes?
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