Youd get a better response in the grand section but,
Vari lok uses a clutch pack to lock upo when wheel spin is excessive.
Using oil with friction modifier (ie standard LSD oil) will severly limit its operation.
Use straight non lsd oil any good quality brand & doesnt have to be synthetic but its better .If diff causes chirping on tight turns (due to locking up) then add small amount of mopar friction modifier additive, try none at first then gradually increase in small increments.Very rarely need as much as recomended by Jeep ,(it will just reduce effectiveness but does eliminate chirp).
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I used to be indecisive but now Im not so sure!!!
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