I agree with Richos reasoning and with SRD4Ds solution, with the proviso that we are talking about vehicles with
out TRC.
The Truetrac has superior torque transfer to most limited slips (I don't know about unobtainium products like Quaife) The Truetrac will not wear as quickly as conventional limos.
If most of your traction issues arise when climbing, there will nearly always be significant weight on both rear wheels for a limo type setup to work really well. Also no stress and strain, no decision to be made about when to lock/unlock, and it is working for you (quietly and unnoticed) 100% of the time - on road and off.
I have untested doubts about combining a Truetrac, or any limo, with TRC, as I think that the two may get confused as they both try to do the same thing in different ways. Maybe an E Locker in the back with TRC and then the TRC simply doesn't try to do anything for that end when the locker is on.
Detroits continue to be misunderstood. They are locked when both driven wheels are travelling at the same speed. They unlock when cornering by allowing the outside wheel to ratchet/freewheel and travel faster than the inside wheel. This puts 100% of the torque being applied to the inside wheel, which is also the one with the least weight on it when cornering. The ratcheting/unlocking is very smooth and quiet in the current models, which are something like third or fourth generation of the product
If things are a bit slippery, or car is grunty, or being driven by WIAH (woman in a hurry
), it is very easy to break traction on the inside wheel when turning. As soon as the inside spinning wheel is turning at the same speed as the outside wheel the Detroit relocks. When it relocks maybe it wriggles a bit, maybe it spins both wheels a bit, but that is how it happens. Be sensible with the right pedal and you should have no problems. All that said, I would much prefer a Truetrac in the rear if I did not have TRC.
We have no choice with our luxes in the front, as there is no front fitment for either Trutrac or Detroit. Further, my understanding of the ADD is that one front axle is spinning all the time ? To use a Detroit in the front, it is desirable to have ALL those whirling bits disconnected by freewheeling hubs, then you won't even know its there on road. Off road far better than a manually operated lock (steering, no decisions needed, etc)