Trying to set up a 44 for a guy who started the job himself. Great I know. The carrier with new ring will not sit all the way into the bearing saddles with the pinion in place. I'ts like the pinion is too big in diameter. Do they make different gears for different years? I was told they have different rotation gears for trucks that run the pinion above or below center but the helix on the old and new pinion are the same. What the hell am I missing? Thanks!