I got this marlin crawler adapter online with no paper work or in structions, the one question i have is ther a specific amount of gear oil i need to add to this through the top bolt on the side of the case or does it self lube through the duel transfercases to maintain lubrication?
![Huh??? ???](https://board.marlincrawler.com/Smileys/marlin/huh.gif)
I appriceate all the info i can get on this set up.