There are 4 basic choices, when it comes to lockers. True positive traction. This mean that when you turn a corner, the other tire will drag, and chirp, BC the wheels are locked together, by ether s posi spool, or welding the spider gears. Then you have what is refered to as lunch box lockers. They replace your original spider gears, with a chunk, that has a gear system, that locks the axels, as needed. Good for off road applications. Then you have true limiter slip. These use clutches to lock the axels for positive traction, as needed. There is also an Eaton truetrac. This is somewhat similar to the clutch base limited slip, but uses helix gears, instead of clutches. Personally, I have an Eaton truetrac in my 97 Silverado, with a Vortec 350, with about 325 HP. I rebuilt the rear end 2 years ago, in February. It does good in the street, but, I accidentally drive off of the end of my driveway, ( this put 1 tire off of the ground, as it was in the ditch, and was touching, nothing) and I couldn't drive the truck out, on its own. I had to pull it out, with my wife's 4runner. And I also have a 1979 Corvette, with the OE positraction limited slip, rear end. Both my truck, and my Vette will burn up both tires, no problem. The Vette is around 400 HP, at the tires, so IDK, maybe 475, at the crank. It's a beast. The reason I choose the truetrac was that, it's not going to need new clutches. That being said, I just rebuilt the rear end, for my Vette, and with 70,000 original miles, the clutches, and springs look fine, so I didn't replace them. If you want the easiest to set up, the lunch box lockers, are the way to go, but they can be noisy. They tend to click as the axel gears pass by the spool gears. My truetrac, does tend to clank, sometimes. Not loud, or anything, but there is a clank, there. I heard the same noise from a friend who has a 1965 GTO. Also a truetrac. LOL, I hear it when I go to Whataburger. Something about the tilt of there drive through, IDK. The Vette makes zero noise. Thrutracs are good for a lot of HP. Have another friend who had 1 in his 68 Mustang, Elenore clone. 865 HP, at the tires. If your under 500 HP, just about any of the limited slip, or lunch box lockers should be fine. Before I bought the truetrac, I looked hard at the powertrax sure grip. My car show buddies, all said the truetrac is the way to go, and for my set up some 373 gears. They were rite. It is the rite choice for me. But, basically, your looking at a rear end rebuild, to do the swap, and you have to get the correct bearings for the truetrac.