heres the problem with tru traks. they are pretty much a limited slip. so off road they do good when all tires are touching. but as soon as one tire is in the air, its an open diff. open problem about them. other wise street wise they are great!
Well, it won't work in the front because of the fact that it defaults to the limited slip. You need either an eaton e-locker or an arb. Those will default to an open diff when not locked. The only problem with the eaton is that they void the warranty if you use oversize tires.
If you try running a limited ship in the front, the entire front driveline will turn as you drive, This will make the truck pull to the left (since the right side is disconnected in 2wd) and also kill your mileage. I would also suggest that if you put a selectable locker in the front, that you pick up a 4x4 posi loc cable to actuate the center axle disconnect, and ditch the vacuum system that the factory uses.
As for the rear, anything goes. You could put in a lunchbox locker or go for something selectable.
Detroit all the way. Just install and forget it. Yes you WILL chirp a tire. It WILL unlock and lock. It WILL go bang and scare you sometime. Guess what. YOU NEVER HAVE TO TOUCH ANYTHING TO MAKE IT WORK. IT IS ALWAYS THERE. NOTHING TO WARE, BRAKE, REPLACE, WORRY ABOUT.
Arb's are just as awesome, with air leaks, bad relays, wiring problems, replacements, etc.
E lockers are great too. Again. worn cables, etc.
Lockrights/TrueTrack. They are not really strong enough for the weight/power balance of our trucks. THEY WILL BREAK VERY QUICKLY AND EASILY. I had a True Track in my old blazer and it broke every other day. I replaced three of them darn things. In the front axle they are great.
Whole lot of misinformation in this thread. Just wanted to clear some of it up.
1st off for the ARB/Eaton Elocker. I have not been able to find them in 28 Spline. Expeditions are 28 spline in the front NOT 31. So looks like the Elocker is out of question for Expeditions
2nd. Detroit Tru-Traks are not 1 wheelers, They are not inferior in strength either. Given the choice I would want one of these over other diffs. I have them in everything from low 5 second 1/8 mile race cars to 4WD off road powerstrokes and everything in between. They are reliable and do not jerk pull like a detroit locker. I dont know whey the blazer has issues but they have been rock solid for us in many ford applications.
Just to add to my point, a good friend of mine is the VP over at american growler, who makes vehicles for the Marine Corp, This is a purpose built offroad vehicle for lifting by Osprey, The diff of choice front/rear is a tru-trak. 8.8 varient as well. They are also building coal mine buggies as well and guess what the diff of choice is?
This car is a 31 tru-trak (at least it was in this video, Since then it broke an axle and got a spool and some 35s, like it needed to start with)
Fox Rodder RS275 shake down turbo mustang - YouTube
3rd-The Detroit locker is a viable option for all out off road dependabiltiy, but its one big POS in daily driving form. IT clicks, It will lock/unlock in curves and if you go on/off gas at incorrect time lock and send you for the ditch. Just not something i want in a nice vehicle I am driving a lot of miles in.
Last-I installed a mustang 28 spline traction lock in my Expedition. No noticable change in gas mileage, It does not pull to the left either. IT does turn the ring/pinion and front driveshaft now. But really thats no different than an older 4WD that came factory with trakloks. OF course ill admit I would prefer locking/unlocking hubs,but it works and its a cheap alternative to a 450$ tru-trak. I had it lying around and figured I would try it. Seems to work fine for me, so I would say its a good option for cheap and it certainly works!
I did install royal purple synthetic fluid and I will keep an eye on Transfer case fluid now that the driveshaft is spining more.
Just wanted to add my experience.
Jeremiah
