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How gentle or severe the service U-joints are exposed to has much more to do with their "expected life span" than miles or years. Driveshafts tend to be extremely durable & most replacements are from getting banged up, not wear.
your talking about a F150- in general i would guess 50% of the rear drive shafts get new universal joints at about 100k miles. The front shaft goes longer since it is seldom used under load.
If you're contemplating DIY U-joint replacement I strongly recommend that you obtain a Haynes or Chilton manual & go over the procedure 1st.
Originally Posted by 40LUTZAG
do you have to take off the bolts off that hold the driveline. or can you just use needle nose to take th u joint off.
None of us are mind readers, your Q is leaves much unanswered. The short answer is both, however there's a LOT MORE to it than that. You can take the driveshaft off w/o a needle nose. Replacing U-Js requires much more than removing the snap-rings.