is this driveshaft sitting exactly where its suppose to?

Jack the caqr up at the rear, put stands under the rear, unbolt the shaft and measure exactly how long the slip yokes bearing surface is and then put it back in and measure the amount you can see from the seal back and then subtract that from the total length of the bearing surface and let me know how much is in the trans.

Many factory yokes are longer than 6", so having 2" out is nothing to worry about.

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Have you done this yet? Guessing you are in the process of it by your last post. Just measure the shiny area, that is where it slides on....or the bearing surface as mentioned above....