I appreciate the help, looks like I'm not prepared to tackle this job just yet. I do have a seal puller but I'll run out to the auto parts store to see if they have an install tool and torque wrench to rent as well as buy a new nut. I had no idea it was a one time use type deal. I certainly don't want to have to do this again if so, it's going to my mechanic.If the pinion appears good as Wes mentioned, then changing the seal is not too big a deal. First thing after pulling the driveshaft is to scribe a line on the pinion and pinion nut so you know where to torque it back to. You're supposed to use a new nut.
Before you remove the nut with an impact gun, use a beam torque wrench or one like below to measure the rotational force in inch/pounds.
When you torque down the nut after installing the new seal and line up the scribe marks, you want to use the torque wrench again and make sure the number is 3-5 inch/pounds more or else you'll have to take it apart.
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Bought a new AAM one and still need to send it out for powder coating. Orange of course as it's a pumpkin!
Thanks again it is much appreciated