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the vacuum operated Patrol Locker would have a 3.9 or 4.1 ratio.
the solenoids [on the firewall] are getting a bit old now and are getting prone to failure
hubs are 6 stud as well

Tas you forgot to mention to change the badge too, but I hear ya buddy.
But thats a no brainer lol

Sounds like a great mod. After you install the rear axle setup you should do the front axle, then a body swap to a patrol and while you've got the body off think hard about a patrol chassis swap,...