Yeah, those things are hard to get out sometimes but I've found that if you put a box end wrench on one of the ring gear bolts, then turn the pinion (forward directon) until that wrench bottoms out on the case then continue to turn the pinion and the carrier will be forced out by the wrench not allowing it to turn. The reinstall is pretty much as the previous poster says, just walk it in with a block of wood and a hammer, or a soft faced hammer. Be careful though as that thing is HEAVY. It's almost too much for me anymore (I'm 55 yrs old now) but you young whippersnappers won't have that much problem with it. I just pulled the positraction (carrier) unit out of my Dana 60 race car rearend yesterday. Broke the spider gears at the track Friday night. I'll pull that housing to reinstall everything. It's easier to do with it out in the middle of the floor.
When you remove the pinion to replace the seal, make sure you tighten that thing up to get the proper preload on those bearings when you reinstall it. See the repair manual as to what the preload should be for your application. There is a different setting for new or used bearings on this.
Also check the area on the yoke that the seal runs on. If it has a deep groove in it, it may not do any good to replace the seal without repairing the yoke too. If the yoke is worn too much, there may be a "speedy sleeve" available to repair it. Check with your bearing supplier if you need one to see if they are available for your application.
Take your time, be careful and I'm sure everything will be ok. Attention to detail can save you some grief down the road! Racer
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Ken-1993 W350, Cummins TD, 5 Speed, 4X4, Club Cab, LE, K&N, Straight Pipe.
http://users. lynchburg.net/ken0069
Attention: TDR Forum Junkies 
