Open diff or limited slip

I went to pick up a dually Dana 80 axle with 16000 miles on it at a recycler today , supposed to be a open diff , was going to add a detroit truetrac sometime later .We pulled the diff cover and it was a limited slip , looks as what had been described to me as a tracloc . I decided to take it anyway as I had already set up to take it to West Coast Differentials in Sac. area to have whatever I bought given a once over, check backlash and visually inspected before I put it in. Whatever kind of LS it is, if this axle checks out I`ll run it until its no good and put in a truetrac later , The truetrac is not as I have been told a full locker its more progressive and has been recomended to me as a good one to tow with and as a traction aid.
I`m certainly not " afraid " to drive with a LS ,Ive had 3 trucks with LS before just not to haul heavy loads , and I have had my 69 power wagon 4x4 big block come around on me on wet pavement when I hit the gas a bit much in a corner, eye opening

Spent a bit of $ today ,ordered dually mega cab type fenders , front wheel adaptors - spyntec will follow , ordered Cooper St max 255/80/r17 33" tires for the stock used 17" rims I found on craigslist for 300.00 . Also picked up some cab and chas progressive leafs at the yard .
One hitch is I could only find rear ends out of 2x4 trucks and the shock - anti sway mts are at opposing angles on them instead of flat on a 4x4 , will have to cut them off and re weld them on flat

I better go buy some more hand cleaner