What about my stock differentials? I heard the late models slip.
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I'm not sure I know what you mean by slip.
I run mechanical lockers because I wanted maximum reliability. I have a Detroit locker in the rear and an Aussie locker in the front. I don't recommend a full locker in the front without upgrading the front axles. I have the original Longfield 30-spline birfields and inner axles along with the upgraded hub gear. This stuff is sold by RCV now, I believe. I ran a Detroit TrueTrac in the front when I had stock axles and with my "easy" driving style I never had any reliability issue with the limited-slip in the front.
The choice between mechanical and selectable lockers is all about personal preference and how you use the rig on the street. I've run with the Detroit Locker in the rear since about 2003 and my rig was a daily driver until about 2004. I've never really had an issue with it on the street. It does some strange things that you just get used to dealing with.