On the right, the cross arms and cups are still wet from grease. On the left, not so much.



Truck doesn't make low speed clunks and high speed rumbles anymore, imagine that...

Yah, familiar with that "groan" sound. First repair investment I made on my 78 F250 was to replace ALL the U-joints in the driveline. That's six of them on a 4x4.
Doc

Fortunately it is a 2wd F150 with a one-piece, so that's all of them...

I hate working on driveshafts! --- Have replaced many u-joints in my lifetime! --- The worst one was in a semi down in Mo. just outside of Bon-Tare ! Had a load of purple decorator rock from Iron Mountain and the rear u-joint went clear out!--- I wiggled the driveshafts before I left home and they were tight, course long distance high speed probably helped!! lol!!

The extra two on the F250 4x4 are on the steering knuckles.Was surprised they used U-joints there.
Doc

my old K5 had u-joints on the front axels. made for jumpy turns when the hubs were locked. I've done the shaft in my Cheyenne twice Damn carrier bearing is a pain in the butt. that shaft is 8 1/2' long total. extended cab with a full 8' bed.