sorry 100 000 kms for my neighbours or should I say "neighbors" to the south. Daily driven in the summer only, is there ever times when your true trac lights only one tire? I tow and drift (on back roads) and if I cant have fun the way I want then I wouldnt want it. Is it quiet and easy to shim?
1. This generation (8.4") Toyota Rear end, is not easy to shim, assuming your talking about bearing preload, pinion depth and backlash. . And if you' are referring to the diff its self, the Tru-trac is a Helical style diff, and is not shimmed like a Clutch type to adjust lock up. Our stock diffs are 1way, lock only under accel, clutch type LSD's.
2. Like Gadget said, the tru-trac is not a locker, it is a Torque Multiplier....so if one tire comes off the ground, it will not lock.
3. If you ACTUALLY drift, as in connect corners, a Helical diff will be terrible for that. mainly to do the weight transfer exerted during the transition, it can peg leg, and "open-up", resulting in a you losing the drift, and boat load of speed.
4. in terms of doing the work your self, you can cut down ALOT on labour, by removing the entire hog nose/3rd memeber as one unit, and bring the new diff, and 3rd member to a local shop. They probably wont charge more then $100 bucks for that install. You really don't need any special tools... 10mm wrench for the brake lines, 14mm for the drive shaft and axle shafts, a set of sockets (10, 12, 14, 17mm)with a 3/8 and 1/2' ratchet. And a 15/16" socket works perfect ( 24mm, same shit) for the drain/fill plug. A set of jacks, stands, and maybe a buddy to help with the 3rd member, as that SOB is heavy as fawk....and to help with the brake bleeding too. Oh, and some drum brake service tools...pliers work...but no ideal
And, by what your saying, the diff is most certainly blown, if you can spin on tire with other on the ground, using minimal force.
Now, depending on what level of driving you sound like you do..cause if all you do is Drift/tow (strange combo...) i would recommend a ARB air-locker... It will work great sliding around on back roads (welded diff and 2 way diff {lock accell/decel}, are the real only route to go for drifting)....Though, you can use a helical, vicious and 1way style clutch type for drifting, it is just not IDEAL... and with the ability to lock it with the flip of a switch, even a slick boat ramp will be no challenge, and once you're moving, you can flip it back, open it up not have to deal with binding issues associated with a Welded diff/full time locked diff.
Now, just the air locker alone....its about a $1,000, maybe a little more since you're north of the border. Not counting installation....
Lunchbox Lockers/Detroit style lockers are also no bueno, do to them only locking under accel, and their On/off tendencies....unpredictable rear diffs and "back road" road drifting can result in you becoming close friends with the local Greenery...:ahhhhh: