07' Gear Selector Problem
 

Hey guys, I have a friend who has an 07' 5.9L Cummins with an auto tranny in it, anyhow the problem is that hes can only put the truck into drive with the selector in the Gear One position. I took a look at the linkage which is working up to the point on the tranny, I notice a resivoir just above it, is it vaccum ran? what are good places to start and check. Another note is its pretty difficult to pull it out of Park. But it shifts fine and runs like a bat outta hell, and its also for sale. Thanks guys!!

Paul