Locker in the rear?

Hi all.
I have been noticing that when I am moving my jagged on pavement the rear end chirps the tires a lot when making a tight turn. I think this has been this way since the beginning but it’s been in the shop last 2 months and picked it up today and it reminded me of driving my jeep with lockers engaged.
List of mods related to performance is short. Sport clutch. Epi belt. Dobeck controller. Dragon fire intake. DF exhaust.

It’s got all the other goodies but not specific to drivetrain. Any ideas? Is this by design? And when I get it hard it pitches sideways like a locker would.
Just want to make sure there is nothing bound up.

And I checked and made sure it was not in four wheel drive.

Thanks for looking. J