Not if your a mopar guy though. most chrysler people look at you funny if you say you have a posi unit in your mopar vehical. the proper terminilogy is "sure grip" make sure if you drain your gear oil, you add the friction modifier, or you will burn your clutches out.

 

my truck has locking diffs in the rear i was told it was the same in the front but its only limited slip makes me mad lock it in 4wd and only one front tire spins

 

unless you get lock out hubs for it you will hate yourself if you put anything in the front other than an air locker or an open up front

 

Never seen the airlockers used for pulling, but ALOT of the local boys have them in their 4x4 trail rigs and they are the cats azz. unlock them for the highway and intown and hit the trail and lockem up!