5 ton lockers

is there any way to tell if the rear has DETRIOT LOCKERS in it without removing the chunk?

lockers question

assuming the diff has no labels, etc, or MWO tags, and it is plane jane, can't you do the old-fashioned locker test by jacking up the axle and (with both wheels off the ground) rotate one wheel, and check for direction of movement of the opposite wheel?

Theoretically, if the wheels spin in the SAME direction, you have a posi/locker....if they spin in OPPOSITE directions, it should be an open diff without posi.....

Not that I have a 5-ton with Detroit Lockers, just going on the old 4x4 info I learned way back when (my first 4x4 was a 76 Scout II with Powerlock rear diff, 345 V8, with 727 Chrysler trans and Warn lock-outs....awesome truck)

Adam

Lift any wheel of any rear axle at a time and try to turn it in either direction. If equipped with D L it should easily disengage and spin free. May be you can hear a klicking noise while turning.