Trail Jeeps

As a follow up for anyone who chances across this thread, traction devices that cause "drag" between the wheels (and a locked axle like a Detroit Locker creates under power certainly counts as drag) will freak a JK traction control system. This includes all auto lockers and clutch type limited slips.

Because a TrueTrac is a mechanical unit that works off of "helical gears" to transfer power, the transition between the wheels is smooth like an open carrier, creating no drag between the wheels that the ABS sensors can pick up. What a TrueTrac does is transfer power to a wheel that is losing traction, which if you're on the street means your breaking a tire lose, engaging your traction control anyway. They are great offload and will some know how, a pair of TrueTracs can work nearly as well as a pair of lockers with practice.

BRinSCupstate

I changed from 3.21 to 4.10 in February. I went with Yukon kits, Truetrac in rear and open carrier in front. All were from Northridge. Reused spider gears. I am very pleased. I thought about front Truetrac but decided to not spend any more than necessary on D30.

DJ1

Contrary to popular belief, which I've seen communicated incorrectly on more than 1 occasion, is that Eaton's Detroit Trutrac actually transfers power to the wheel with the HIGHEST traction.






---> Detroit Trutrac Differential, Helical Gear Limited Slip Differential - Vehicle - Eaton


Even the OEM Trac-Lok limited slip works in the same manner up until the clutch packs wear out and now you basically have a POS open diff.


The great thing about the Truetrac for the rear, is that it is always reliable. No stuck locker engagement that you always seem to hear about from those running the Rubi-lockers and no potential air-line failures for the ARB. Actually, according to Eaton, the Detroit Truetrac has the lowest % of failures in all of Eaton's product line. Pretty amazing especially when you consider that there are many 600HP+ vehicles running it.


I do run an ARB in my front 44 and am awaiting delivery on the rear XD60 with the Truetrac.




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tarpon4me

Since its on topic, I figured I would eliminate any confusion on how well a TT functions. The link below will take you to a video from this past weekends event my club hosted. That s me behind the wheel of my 2014 JK with front and rear TT. They lock up every time. Also the myth about them not working when a tire is in the air, not true. You can clearly see all my tires continue to dig, even when my drivers side front leaves the ground. Enjoy!

https://youtu.be/vYobEmWPTYg

DJ1

Nice vid!

Now I'm really glad I decided to go with it for my rear setup. It didn't make much sense shelling $960+ for a rear selectable that basically sees minimal use even when offroad IMO. For more of a dedicated trail rig, I get it but for a DD.....



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Trail Jeeps

This is a great video, everyone who doesn't get how effective a TrueTrac can be should watch this. It does want to transfer power to the highest traction wheel, but it requires contact on both wheels to properly load the unit, which is why it is so seamless on the road. You can see the effect here when this guy's wheel is off the ground, the unloaded tire does want to spin. You can see it trying to load up the wheel on the ground, but it takes a little bit of oomph to get to to transfer power. There are situations I've seen where one wheel is stuffed and the other wheel is in the air. The TT wants to transfer pretty much everything to the free tire BUT if you load up the brakes in that scenario, it'll move the power to the loaded wheel very effectively and get you out.

Fun story, my dad and I built this amazing rusty bucket of an XJ. We ran the Dana 30 with 4.88 gears and a TrueTrac for years, and we flogged the XJ on 35" tires. When the Dana 30 finally gave out after years of abuse, we installed a Dana 44 out of an F250 High Boy in the front, and we could have thrown anything in there. With the Detroit in the rear, we decided the TrueTrac worked so well that we might as well put one in the new D44 where it has been ever since. No air lines, no hassle, the thing just works.