You (and everyone else) should watch this old video explaining to smart farm kids how a differential works:
https://www.youtube.com/watch?v=yYAw79386WI
It's a great video.
Anyway, there are three main types of limited slip:
- Locker
- Clutchpack
- Helical
Locker is the most positive, but can be a handful if you (for example) floor it and do a trans kickdown while trying the change lanes.
The Helical is what I went with (TrueTrac being a common name). It'll still push, but less so. The only time I really notice it is if I'm coming into a roundabout and accelerate into it, it'll want to push the car straight instead of around the circle.
Clutch Pack (like most GM posis) is the easiest to life with, probably, but wears out eventually and doesn't have the greatest holding power of the bunch.
When I had to made this choice I went Ford 9-inch with a Truetrac differential and am very happy with it.
I also had a Truetrac installed into the Dana60 of my Longhorn. It's a little more aggressive at times, I may not have enough friction modifier in there. But in both cases I'm pretty happy with the result.
If I understand the Detroit Locker, and I'm not sure I do, whe you're going around a turn the outside wheel can go faster, but never slower, than the inside wheel. So there's a minimum wheelspeed that each wheel must maintain, but it can exceed it for going around corner and so on. Sounds ideal on paper. But that article above says of the locker: "the internal components unlock to allow one wheel to spin (free wheel) faster or slower as necessary". That sounds wrong (the slower part) but I'm not 100%