My case works ONLY in 4loc. All others are like neutral. I went went to adjust the linkages like it says in the Chiltons manual. The manual says to insert a drill bit into holes in the shift lever when they're both lined up in neutral. I do not have one of these holes. The rest of the adjustment looks pretty straightforward, but how do I make sure both shift levers are in neutral? Also, are there rebuild kits for np203's? where do I get one, and can it be rebuilt while still on the vehicle?