I doubt it's the u-joint (chk then anyway)... but I'd hazard to guess it's one of two; the rear axle shaifting about (A-frame pivot worn or lose, or rear axle link arm bushings at chassis)... but i'd check that the input gear has gone south. Pull the PTO cover and check the splines indide the INPUT gear; If all gummed up and rusty looking in there you have troubles! LR has known of the this problem for ages, and tried to cure it. You're in teh area of having the old gear... The NEW input gear will have 4 holes drilled in it to help lube splines, problem is, unless you increase the trasnfer oil level by a PINT (US) you won't get any splash oil to the gear. If gear is bad, mainshaft on gearbox will be too.
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