RR DIff Lock and 6 inch lift

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It means the Locker is not yet engaged...sometime's it takes a few for the gears to line up correctly. The light will be on when its engaged...not blinking

 

best way to engage the locker is to press the button while at a dead stop, if it flashes crawl forward (under 5mph) while turning the wheel side to side until you hear the click of the actuator and the RR Diff light goes solid. If it stills flashes, put the truck in reverse and crawl back for a couple feet and it should lock.

whatever you do, don't punch it or go above 5mph until the light goes solid...

 

Yup, ColtsTRD and mikesdoublecab nailed it.

I don't know anything about the 6 inch lift...but if you get it installed I'd love to see some pictures!