I don't know about "JACKING THE TRUCK UP" , but it really sounds a whole lot easier to call the dealership and provide them, with the last 8 numbers of the VIN. But hey, it's your choice. Good luck.

 

So what are the options if you want but don't have a limited slip diff.? A Locker or a new Diff.?

 

Ummm...Ummmm... I hope not..
LSD and regular diffs will BOTH spin like that without an input direction and load.
This is not a valid test.

Take a look for a tag on one of the bolts on your diff's cover if you didn't keep the window sticker..
If there's still a doubt, stop by any DCX dealer and have them scan your VIN and pull up the specs.

 

Depending where live you might have luck at a salvage yard and just get a complete rear end. If you go the after market rout I would avoid a locker if you drive much on the street, but then again if it is an off road vehicle the added benefit of a locker may be worth the added tire wear. A good after market diff to look at is Power Trax (I think that’s the one) this is almost a locker but is supposed to be street friendly, but I don't have any personal experience with one just what I've read and heard. I wanted to say that Arrowman but have never tested it on my truck. That sound more like a spool than an LSD, even most locker require input to spin the wheel in the same direction.

 

Just talked to dealer. They sell the LS gears for $625. It's easier than changing whole rear end. Will probably have them change the gears too to keep warranty intact. Probably total cost just under $1000. Oh well, hard to earn, easy to spend.

 

Not really sure. But i would venture to say that alot of the guys on this forum could provide you with an answer.
If not, you could always consult a parts person at the dealership, to get some idea.
Hope this helps.