Ok, I have the AMC 20 Warn Full-Floaters, and a twin-stick, let me clarify this post which has some mis-information:
1. I don't know what other axles they provide, I have only seen the Model 20. It provides a few things; The ability to flat tow with nothing engaged (Including odometer), full-float so if you break an axle, the tire won't take off, and the ability to pseudo run in front wheel drive.
with a twin sticked t-case you could drive in front wheel drive only if you had a rear axle go bad
Yes, and no. My Dana 300 with twin sticks adds the ability to run FWD Low, and RWD Lo in addition to the standard 4wd hi/lo and RWD High. The Dana 300 can be modified and the stops taken out to allow FWD Hi, however, by taking the stops out, it can also allow Front Hi/Rear Lo and vice versa, which means the Dana 300 TC will go BOOM! So be careful with this Mod. With the full -floaters, you can drop the rear driveshaft, unlock the rear hubs, and run in 4wd high (essentially FWD) with nothing spinning in the rear.
Warn also makes a part I believe called "hub fusers" or something like that these replace the lockouts with a solid piece of metal(unshure if steel or chrome-molley or what). If you want full float and don't need the hubs get the fusers they are said to be designed to fail first,
You are talking about 2 things:
Hub Fuses and Hub Flanges.
Hub Flanges are Replacements for Hubs, they are stronger, but do not lock/unlock. They are engaged full-time. You need to go back to Hubs to free-spin.
These are replacements for the Hub Clutch ring within the hub. They are designed to break before a U-joint and are easier and cheaper to replace than a U-joint (or axle). However Warn does not make these, nor recommend them on the full-floater kits. And these are definitely not recommended with lockers, as they let go so fast they can bust the gears in your lockers very easily.
4.As an aside, I found if you have full floaters and a locker/LS in the rear, you may not get the second hub to fully engage due to the small amount the axle needs to turn to line up. You will need to get the Jeep in a slow, sharp turn (Axles spinning at different rates) to engage the 2nd hub while the jeep is moving. Do NOT force the hubs, they will break (Ask me how I know
) Or you can Jack up the rear to do the same thing, if you are by yourself.