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I get rebuilt U-joints with exchange of the old ones from John Chilcoine in MA. Good to hear that you found a solution to yours.
How often should you disassemble and regrease?
Every time you change the rear tire.
So are the crosses 'drilled' so the grease can go to all four? That sounds like my kind of fix.I've never serviced Ujoints that often on cars. Usually grease them every 20k miles or so.This ujoint has not been serviced in over 50k miles.
Just remember if you have more vibration in the right peg. Your u-joint is starting to give up the ghost. Having it go in traffic is no fun. Got lucky and had one blow coming down to the last 10' of a stop after flying down I90.