When it comes down to it all lockers are pretty expensive. Since you are going to make this kind of investment, make sure you know why you want lockers, and what you expect from them.
What kind of wheelin, if any do you do? Or is this a street application? I presume in your case, since you have a 4x4, you want the lockers for wheelin.
The next question is what kind of wheelin.
ARB are hard to beat for serious wheelin on rocks and the steep stuff. By the way someone has come out with an electric locker for the 8.8" rearend, but they don't plan on doing one for the Dana 35.
"Lockers" - These have come a long way. Some of the newer models are very nice, but they are still noisy, and can be dangerous for winter driving. "Detroit Locker" sets the standard.
The lockers that fit into your existing carrier have had mixed reviews. I have noi experience, but articles indicate that they don't measure up in the durability department. If you are changing your gear ratio you may also need to buy a new carrier.
I would NOT put one of these in the front differential.
Limited slips are good, but there is a high degree of variation. From my experience with lockers here is what I have observed....
Torsen - This is a really good unit, and won't wear out (no clutches). There is not a model for the Dana 35 front diff. I loved my Torsen that I put into a Dodge. It engaged / disengaged flawlessly, was smooth, quiet, and handled well on and off the road.
Auburn - This is also a high quality unit. The clutch pack will wear out, and is NOT repairable. It is designed for street racing / track use. It is probably the most popular unit at the local track. It makes a good 4x4 unit as well. You can get it in two different torque bias's
Traction-lok - The stock unit in the Expolorer and other Fords. This is a clutch type unit that is rebuildable, but it is not near as agressive as the Auburn units. It will wear out much quicker than the Auburn as well. It's not a bad unit, but it was designed for all around use. The bias is set up so that it still has good street maners, which compromises is versatility as an off road unit.
Spools - These are great on the track only, otherwise DON'T. You can only put them in the rear. You can drive them on the street, but your tires will wear out VERY quickly, and you can't drive on snow or ice.
I checked into 'em, and I know they're really good lockers, but man, are they ever expensive!
