not a common thing but my grand pa has a BUDDYLOCK in his ZL fairlane. i would have to say the BEST security you could get. cost about $400 plus installation.
in short the gearbox is removed and bolts are screwed through (from underneath the car) into the buddylock which sits beside your gear shift making it almost impossible to remove without an angle grinder and about a half hour of cutting as it it ultra hardend steel. when in park the buddylock engages around the shifter itself and locks into place, like having a big arse padlock around your gearshifter. even if they get into your car it still aint goin any where!
looked through the site abitand mainly found the locks were for newer cars. if you wanted to fit to an older car then contact them as they do have locks to fit everything. i noticed a whole new range as well....oh check out the FAQ section.
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