A few years ago I had factory locking axles installed on my 80. I paid $2000 to "trade out" my unlocked axles for locked and have the install done.
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I have 3:55 gears ( cummins swap) and had to use a 100 series carrier on the rear diff to make the gears work. I can't go with an aftermarket locker and will have to go the route of factory lockers.I saved a bunch of money doing it peice meal, but I am a good shopper
Front Locker -$375
Rear Locker - $350
ECU $100
Wiring harnesses Under $100 for two and made third
Long side rear axle shaft $50
$600 to install lockers and modify axel housing
Assuming its cheaper and easier to buy whole axles and do the swap is not 100% correct. I paid less to do this peicemeal and have the lockers installed (I did electronics) then axles would cost. Then you have to ship, install and still worry about the electronics
Course it all depends how much it costs to get the locker