I'm going to ask a question while i have all u guys here talking rears. I had the pinion yoke off of my 10.25 two or the times while hunting down the 1350 yoke (that's a whole 'nother story) my question is did i F#@k up the crush sleeve by just banging the yoke on with the gun all those times??
The way you put a crush-sleeve axle together is you constantly check the pinion preload as you tighten the nut - first you take all the slop out and check preload, then you tighten nut some more and check preload again, then tighten more and check again, and so on till you get the preload where you want it. If you overshoot a tiny bit don't back it out, just leave it be and run w/ it. If you overshoot by a lot you should pull the yoke and sleeve out and try again w/ new sleeve.
So whether you killed your sleeve or not greatly depends on how you used the impact. If you started w/ fresh sleeve and simply ran the nut in till you took up the slack, but never continued w/ the actual crushing of the sleeve to get proper bearings preload, then you should be fine. If you only crushed the sleeve a tiny bit, but never got the bearings preload up to where it should be, then you will again be fine. However if you just took the yoke off an already assembled and preloaded axle, or you got the pinion preload up to specs the first time you put axle together, then chances are you'll be needing a new sleeve. Which should be obtainable at just about any parts store, may have to wait a day till they get it from warehouse tho.
That said, years ago I found my pinion yoke loose, and not knowing any better I just tightened the nut back in w/ a large breaker bar (working parking brakes are excellent help in that matter). Up until my last long road trip I never had any problems w/ it, and in the mean time I've had the diff out twice (first time to Lincoln-lock an open carrier, 2nd time to replace it w/ proper factory LSD carrier) and gear wear was still perfect. Hopefully it still is perfect, and my front seal leak was caused by petrified seal and not by loose yoke.
Also, my crush sleeve eliminator kit just showed up today. Has very simple and clear instructions on how to install it, also a table of now to combine the shims (kit includes one .010, two .012, one .016, and one .020, just wish they were labeled) to achieve different stack thickness as needed. Gonna play w/that maybe this weekend, still need to procure the actual seal, Dana 70 ring gear bolts, new brake shoes, and also poly swaybar bushings - if I'm pulling wheels to get to axle shafts I might as well do brake, if I'm pulling diff to inspect bearings might as well fix the bolts issue, and if I'm dropping the driveshaft hoop for the pinion seal might as well do bushings. Sounds like a fun day, ain't it?