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Old 02-07-2019, 11:55 AM
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Adding Detroit Truetrac LSD to Front Dana 30?

I am thinking of adding a Detroit Truetrac to front Dana 30 on my 2016 JK Willys edition.

Is there any reason I wouldn't want a LSD in front and back?

Thanks, I'm a Jeep noob

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Old 02-07-2019, 12:14 PM   #2
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I run a TrueTrac front and rear in my XJ. It does great on the street, great in snow, and pretty good on the trails. It's a great addition to a Jeep that does everything but the more difficult trails.

For the really difficult and extreme off road trails, a selectable locker is a better choice. It's what I have in my lifted JK on 35's.


Are you changing out the gear ratios in your axles at the same time? If you're thinking about doing that, the time to do it is when you're swapping in the TrueTrac since it uses many of the same parts and involves doing the exact same labor. Some noob info on why you would want to do that is written up here: http://www.grimmjeeper.com/regearing_basics.html

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Old 02-07-2019, 01:48 PM   #3
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Works great on my jku, i have trutracs front and rear and everyone thinks i have lockers!

If you build your jeep so that it flexes good and keeps the tires on the ground 95% of the time, then you will be fine. They are essentially lockers if you have both wheels on that axle touching the ground.
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Old 02-07-2019, 06:15 PM   #4
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I have them front and rear as well. Tremendous versatility. All but the gnarliest rock trails. I'd even say they are superior to lockers on the trails most mortals will do because you do not get the straight push of lockers when trying to negotiate turns. My use is CO mtn trails of level 7 or 8 tops, but overland and level 5 or 6 preferred.

There's a good video by Currie on the problem of steering with rear lockers, worth a look. Trying to find the link for an edit.

Edit:

1:50 mark for his comments on Truetracs. 2:10 he talks about nimbleness lost when locked. That for my usage is more important. I can pick lines better and adjust in tough sections easier than my locked trail mates.
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Old 02-07-2019, 08:35 PM
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Awesome!

I'll get one installed in the front.

Any reason to replace the factory TracLock in the rear?

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Old 02-07-2019, 09:25 PM   #6
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Re: traclok, I'm sure others with more experience will chime in. But you have the traclok already. It'll wear out faster offroad. It's decent on road. Make a decision when it gives up the ghost on whether to go locker or geared LSD then. You'll have some experience with whatever you put in front.

Comes down to intended use for all these options. Common offroader scenario of 90% street and mild to mid trails, vs actually upping the trail ante to the point where lockers would be a benefit. We just had a good snowfall here the other day, and the Truetracs really shine on slick pavement. Another variable.

Also if you're not an experienced offroader, you'll build to harder trails. In the time it takes to get there, the non-locker setup might keep you out of trouble and teach line picking better. That has been my experience as an only 2 year wheeler. I've learned I don't particularly like trails that would do better with lockers. I'm scenic biased and mid-challenge level oriented.
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Old 02-07-2019, 09:39 PM   #7
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Originally Posted by belrix View Post
Awesome!

I'll get one installed in the front.

Any reason to replace the factory TracLock in the rear?

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If you are regearing you may not have a choice. I was going to keep my factory rear LSD but the spider gears were all chipped at 20k. It was running with zero noise down the road so i was surprise when we pulled the cover. How many miles on your jeep? If low miles and the factory gears look ok you may be fine. The clutches wear out but many others like me have had the gears chewed up first. If you go with a TruTrac you will not ever need replace clutches. I went with a TT rear and an selectable e-locker in front. I live in MN and do not like the idea of limited slip front. I also like to go to UT and play in the rocks to this was the best setup for me.
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Old 02-07-2019, 11:06 PM
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Not planning on re-gearing, going to stick with 3.73. I am new to JK's but grew up driving a '69 Chevy 4x4 with a 327 Also spent 12 years in the Army driving gamma goats, m151a2 jeeps and gen1 numbers.

I am not planning on lifting my JK, but will move up to a 255/80-R17 tire when the stock BFG's wear out. JK currently has almost 15,000 miles on it. Picked it up with a little over 14k and the previous owner didn't off road or mud it

I do pretty light trails, fire roads and impassable when wet roads.


I'll get the TruTrac installed up front and go from there.

Thanks for the replies I'm learning lots

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Old 02-08-2019, 12:16 AM   #9
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Awesome!

I'll get one installed in the front.

Any reason to replace the factory TracLock in the rear?

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No absolute need until it goes out and or starts chipping the teeth in the spider gears. But it's not a bad idea to do it before it goes bad (eventually).

At best, it will stop limiting slip and act like an open differential. At worst it will have a bunch of metal chunks floating around, damaging other things. But it may take many tens of thousands of miles to do that.

If it were me, I'd just go ahead and do both at the same time and get it over with.
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Old 02-11-2019, 07:47 PM   #10
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I did both front and rear in my JKU when I re-geared and they have been great. Like others above have mentioned, my Rubicon friends think I have lockers since they work so well. I had TracLock LSD from the factory and the clutch packs had fallen apart and the spider gears were chipped...I would replace front and rear. Good luck!
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Old 03-03-2019, 12:54 PM
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Having trouble finding a local shop that wants to install the Truetrac.

Issue with living in a small town

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Old 03-10-2019, 02:20 PM   #12
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Belrix,
Check with the nearest Jeep club, they will almost certainly have some options for you. I almost gave up on searching for a shop to install my Truetracs (D30 as well). The first shop that I found quoted me $800 for the install alone. Needless to say, I did not get the TT installed there. Luckily, I saw a bunch of jeeps parked in front of an automotive shop and I stopped in to check if they provided the services...$560 later, installed with no issues.
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Old 03-12-2019, 02:13 PM   #13
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Luckily, I saw a bunch of jeeps parked in front of an automotive shop and I stopped in to check if they provided the services...$560 later, installed with no issues.
I've found this to be accurate. Diffs are diffs. Auto shops that handle pickup truck sized vehicles can handle Jeep D30s. I've had no trouble finding independent shops willing to do work on mine.
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Old 03-13-2019, 09:57 AM   #14
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When I did the 2018 I used a local transmission shop. $450 labor and I have never heard a single sound out of the rear diff they did the swap on. I spent a pretty penny at a well known 4x4 shop in DFW when we did the wife's 2015, it had no issues either, other than making my wallet lighter.
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Old 03-13-2019, 11:17 PM
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Transmission shop! What a great idea!

Thanks


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Old 03-16-2019, 10:22 AM   #16
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My 18 JK Willys came with the optional rear locker so I had a local 4x4 shop install the front D30 trutrac two weeks ago. It may just be my imagination but I work in the rainiest city in America, mobile, Al, and with the really shitty stock KM's the traction in the rain seems better.
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Old 03-17-2019, 01:00 AM   #17
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My 18 JK Willys came with the optional rear locker so I had a local 4x4 shop install the front D30 trutrac two weeks ago. It may just be my imagination but I work in the rainiest city in America, mobile, Al, and with the really shitty stock KM's the traction in the rain seems better.
Interesting, I didn't realize the Willys came with an optional rear locker. Can you elaborate?
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Old 03-17-2019, 04:34 AM   #18
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Interesting, I didn't realize the Willys came with an optional rear locker. Can you elaborate?
I think it was only for 2018. It was a 1500.00 option I think. It's the exact same locker the Rubicon comes with but only the rear. I think the big bear had the same option. I didn't order it that way and it was the only Willys on the lot with it. I didn't care if it had it but it was the only red willys wheeler w 2 Dr to be found.


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Old 03-18-2019, 09:09 AM   #19
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I think it was only for 2018. It was a 1500.00 option I think. It's the exact same locker the Rubicon comes with but only the rear. I think the big bear had the same option. I didn't order it that way and it was the only Willys on the lot with it. I didn't care if it had it but it was the only red willys wheeler w 2 Dr to be found.


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Very nice. Sounds like you have a solid set-up.

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