You must have something backwards. Try this: Remove the lower linkage, put the shifter in Park (turn the key to "Off" so it can't move, go under the truck & manually put the trans in "Park" (verify by not being able to spin the driveshaft with the rear jacked up), loosen the 1/2" bolt on the linkage & install it to see where you are, snug it down & re-check. My guess is you have the Z-bar going in the trans bracket 180* off with the trans all the way in Low. Hope this helps, Lorne