Is there any reason this diff won't fit in my Wrangler's rear axle? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 20 Old 04-02-2009, 10:09 AM Thread Starter
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Is there any reason this diff won't fit in my Wrangler's rear axle?

http://store.summitracing.com/partde...=DTL%2D913A590

Looking for a limited slip rear, besides OEM this is all I could find. Would rather not have a locker unless it's electronically controlled. Open to other ideas. I have stock open front and rear (read: GARBAGE), and want at LEAST a good rear diff. Thanks! Mark W.
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post #2 of 20 Old 04-02-2009, 10:38 AM
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There seems to be some confusion out there.

I would talk to Detriot (weren't they bought by somebody?) and ask them. Most people say that the ring holes need to be drilled out and tapped for a different size bolts. I belive that is the only modification that would be needed.

I have also read that some people just installed it with no mods needed.

You of course would need the proper spline count but my understanding is there ARE people who have put a Detroit in. Some have also reported NO modifications although that is not confirmed. Contact Detroit or whoever owns them now. Post up what you find here!

I don't have the money rght now but I will be putting a Detroit in the rear. When The time comes I will share all the details I learn here at JKO
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post #3 of 20 Old 04-02-2009, 10:52 AM
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Personally I would not run a Detroit in a Jeep. Did it once, HATED IT!.

Long wheelbase automatic trucks do "okay" with full time lockers.

Full time lockers are a pain on the street for a daily driver.

That is the whole reason they make selectables.


I have a Detroit in my 1 ton Crew Cab automatic truck and it is only somewhat noticeable.

I had one in my TJ and HATED IT. Talk about a clunky, squirly no fun to drive rig. I tossed in for an Eaton E-locker and life was good again.


Quote:
Originally Posted by WTF_LOL View Post
There seems to be some confusion out there.

I would talk to Detriot (weren't they bought by somebody?) and ask them. Most people say that the ring holes need to be drilled out and tapped for a different size bolts. I belive that is the only modification that would be needed.

Eaton bought Detroit.


The ring gear bolt holes are bigger on the "Next Gen" Dana 44 ring gears. There is no taping that needs to be done, just holes.

I "think" if you buy a 3.92 and down carrier it will fit the "next Gen" gear offset, but I have only heard it as a rumor. Can't varify it.

Just see if they make one for our diff specifically.





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post #4 of 20 Old 04-02-2009, 11:01 AM Thread Starter
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That's why I'm not running a locker ^ I'm looking at a limited slip diff- BIG difference- Mark W.
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post #5 of 20 Old 04-02-2009, 11:07 AM
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If you run larger than a 35" tire you are going to regret that.

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post #6 of 20 Old 04-02-2009, 11:12 AM Thread Starter
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^ Why's that? And I don't plan to go bigger than 32 or 33, but I'm just curious- Mark W.
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post #7 of 20 Old 04-02-2009, 11:16 AM
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Quote:
Originally Posted by thaduke2003 View Post
^ Why's that? And I don't plan to go bigger than 32 or 33, but I'm just curious- Mark W.

It will implode on itself...just not up to the task of spinning large tires like that...saw one literally explode this past weekend.

The carrier split into about four pieces!

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Last edited by terrahawk; 04-02-2009 at 11:18 AM.
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post #8 of 20 Old 04-02-2009, 11:20 AM
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If I remember correctly, most cases need to be drilled and re-tapped for 7/16" ring gear bolts. Some companies are starting to make their cases to accept these but not many yet.

Also, like Terrahawk said... if you look at the Tru-Tracs manual(available online) I'm pretty sure they are only rated up to 32-33" tires, anything above that voids the warranty so be careful.

Although, I don't think the picture terrahawk posted is a tru-trac, correct hawk? They are gear based limited slip rather than clutch based and the carrier is much beefier.

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post #9 of 20 Old 04-02-2009, 11:41 AM
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Quote:
Originally Posted by Prope View Post
Although, I don't think the picture terrahawk posted is a tru-trac, correct hawk? They are gear based limited slip rather than clutch based and the carrier is much beefier.
It was a Posi-Trac, IIRC.

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post #10 of 20 Old 04-02-2009, 12:34 PM
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The bolts thread into the ring gear not the carrier, so you will only have to open up the holes in the carrier. Recently I have fitted a couple of True-Tracs into a customers TJ and had to sleeve the holes in the True-Tracs as they were for the larger bolts.

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post #11 of 20 Old 04-02-2009, 01:20 PM Thread Starter
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Hold on- sorry- I'm having a hard time picturing that, Steve- I need to open up the bolt holes on the diff itself? Or sleeve them to make them smaller? Sorry- mechanic's brain- I need to have it in my hands to get it Thanks! Mark W.
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post #12 of 20 Old 04-02-2009, 01:28 PM
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The ring gear is bolted to the carrier. The bolts go through a hole in the carrier and thread into the ring gear. The hole in the ring gear needs to be eith enlarged or sleeved to be the correct size for the ring gear bolt
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post #13 of 20 Old 04-02-2009, 01:28 PM
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Quote:
Originally Posted by thaduke2003 View Post
Hold on- sorry- I'm having a hard time picturing that, Steve- I need to open up the bolt holes on the diff itself? Or sleeve them to make them smaller? Sorry- mechanic's brain- I need to have it in my hands to get it Thanks! Mark W.


The ring gear holes on the carrier are bigger for the JK ring gear.

So on older non JK type D44 the Ring Gear bolt holes on the carrier are smaller.

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post #14 of 20 Old 04-02-2009, 01:33 PM Thread Starter
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Gotcha- I take it the ring gear is hardened, so I'd probably have no luck with a regular drill, na? Mark W.
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post #15 of 20 Old 04-02-2009, 02:17 PM
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I've run a Trutrac in the front of my Bronco for years. It held up to 35's; it will lock up pretty good if you ride the brake while on the gas. It doesn't have clutches that wear out which makes it nice.

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post #16 of 20 Old 04-02-2009, 02:19 PM
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Quote:
Originally Posted by terrahawk View Post
It will implode on itself...just not up to the task of spinning large tires like that...saw one literally explode this past weekend.

The carrier split into about four pieces!
That carrier looks like a Traclock. It is weak, a better version is the Powerlock but it still has clutches.

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This is exactly why we need to practice proper gun control.

If he was aiming down the sights correctly and had plenty of practice rounds under his belt, there would only be one side of this story.
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post #17 of 20 Old 04-02-2009, 02:27 PM
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Was...a Traclock LOL .

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post #18 of 20 Old 04-02-2009, 02:28 PM
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Obama, The greatest gun salesman since the invention of firearms.
Quote:
Originally Posted by Jscwerve View Post
This is exactly why we need to practice proper gun control.

If he was aiming down the sights correctly and had plenty of practice rounds under his belt, there would only be one side of this story.
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post #19 of 20 Old 04-02-2009, 02:35 PM
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Quote:
Originally Posted by thaduke2003 View Post
Gotcha- I take it the ring gear is hardened, so I'd probably have no luck with a regular drill, na? Mark W.
No you do not have to modify the ring gear, it is the carrier that you may have to alter. The bolts pass through the carrier and tighten into the ring gear. So you may have to enlarge the holes in the carrier.

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post #20 of 20 Old 04-02-2009, 02:37 PM Thread Starter
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Thanks, all. Is there a write-up anywhere about diff swaps in the Dana 44? I'm a competent wrench monkey, but having instructions/photos will make a world of difference Thanks! Mark W.
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