solid line of thinking

 

Alright guys. Bustabiz gave me a deal I couldn't pass up on so I am going to run Trutracs front and rear and 4.56 gears.

Can't wait to get this installed. . should be less than 2 weeks away!

 

A Detroit is always locked unless it is cornering. During a corner the unit senses the overspeed of the outside tire and unlocks that side. When the vehicle returns to straight and wheel speed is equal, the differential once again locks. In a slick environment (like ice), there may not be enough traction to unlock the outside tire. When the unit doesn't unlock, the locked rear will want to push the vehicle straight though corners (understeer).

Overall tire circumference due to wear and/or unequal air pressure will cause a Detroit to lock and unlock at inappropriate times because the unit is sensing unequal wheel speed and unlocks even if the vehicle is going straight. This is the cause of most of the complaints people have with Detroit driveability.

A Truetrac never really locks up. If one side starts to lose traction gear separation forces inside the unit push power to the side with traction. It can only push 3x (actually just under 3x) the bad side to the good. If you have zero traction (like a tire in the air) on the bad side- 3x0=0. If you are getting some traction, say 50 lbs torque, to the bad- 3x50=150. This should be enough to move the vehicle.

A Truetrac is a great option for the light duty part time wheeler. This is especially true in an area that gets frequent snow and ice. It offers great traction even if you don't know you need it. In this case it is much better than a selectable because you don't need to make any selection. For a great many people a TT is the best option.

I haven't had much feedback on how the JK's traction control interacts with a TT but I'd like to hear it. In a Nissan Titan, when tire was lifted off the ground, the traction control applied enough brake to drive the rig with only the tire that was on the ground.

 

Once I get these bad boys installed I will try and do some experiments and post the results of the traction tests.

 

I've run both, a full selectable locker and a Detroit TT.

Hands down a selectable locker is better.

If you haven't run both, then you are merely guessing.

FYI, a few clicks of the e-brake works wonders in getting the TT or most any LSD to hook up.

 

Thx. Very good info. I will be certain to try that if the need arises.

 

This is true of you primarily run off road.
If you do little off road and spend a lot of time on slick streets a TT is a better choice.

 

Yeah, but with the JKs Brake/traction control, why bother? A TT is what, about $450? Might as well save up another $200 for an ARB and another $200 for OBA to run it. While not a fan of OX, they are only $850.

I've had the TT front and rear and on snow/ice it will crab walk on you under power. Open diff'd it wouldn't crab walk on me.

Different strokes. Ya know? I don't think I've ever met someone with a selectable locker wish they had a limited slip.

Met lots who wished they'd saved a bit longer and done it once.

Gotta love the availability of parts to make your Jeep your own.

Keep the shiny side up and see you on the trails, or street.

 

I am getting a TruTrac installed tommorrow, in the rear axle!

 

I'm planning on picking mine up tomorrow and hopefully get them installed in the next couple of weeks. Can't wait to get the 4.56s installed! It will be a welcomed upgrade from my 3.21s!!