yea, i forget who it was, but in the tech section he replaces the soldered led's (i think its like scottyboy maybe?) but to test everythng to make sure its good before he ships it back to you he sticks it in his truck to make sure everything works, as far as i know you can just swap them all day long with the mileage changing
also for your 4wd do you have auto4? if you do try putting it in auto first and then switching back into to 2
also for your 4wd do you have auto4? if you do try putting it in auto first and then switching back into to 2