I don't believe Dr. Diff has kits to swap out tapered axles, however you might be able to pick up the axles, bearings and housing ends needed individually. Even if a kit did exist it would be a lot of work. Also, Yukon may make cut to fit axles but NOT for the 8 3/4 tapered axle housing. The difference in how and what bearings this unit uses preclude just swapping out axles, the housing ends must be cut off and replaced which isn't an easy job, unless you do it often.
To begin with the ONLY reason to swap out the tapered axle rear is ease of maintenance on the brake system. If you do the simple and inexpensive brake drum swap then there is no real reason period.... unless you're cranking out a bunch of HP and you're racing every weekend. In that case you would want to switch to a Dana anyway. Remember, those axles were designed to handle all the HP the Max Wedge cars could throw at them and they are just as reliable as any other 8 3/4 out there so .... spend your money wisely.
If you just have to swap it out then any of the late 60's "B" body units will bolt in. However, you'll have to change your wheel backspacing based on the actual measurements of the rear you wind up using. You may need more or less which will require a new set of wheels either way.
