Looks fine but you would check it in neutral for pinion suspicions and in park for u joint . I used to squeeze under and reach arm to the ujoint then have some one shift with motor running from drive to reverse if the knuckles on the driveshaft deveated on movement (sechronicitie)more then say .025 thousanths it's time to check the ujoint pins and there lube taking notes for any future cross state driving ect generally fine for local jumps. We need to know if your in neutral with the wheels both of the ground if it'd possi Trac or one wheel up if it's limited it's probably fine but really for the farm hands "out there pouring old motor oil in worn ujoints keep them going longer okay if you got limited differential jack the right rear ( or left ) tire off the ground havr it high enough to crawl close to driveshaft with your face take your foot and rock the rear tire while staring at the driveshaft and each ujoint in turn ( reposition) to much play at the ring gear will show at the rear yoke as slack between separate motions lets say 20 degrees might be ok free play there .and feeling with your hands the distance between the saddles of the joints could show gross slack (interpreted as wear) failing to find excess slack simply means your safe for the time being.but seriously I understand you have suspicions about a clunk or vibration. Let me stuck my neck out here..lol" if it is the driveshaft vibrating look at it with the car jacked up axle on stands /blocks" so it can spin.watch what you see under the car...use a block of wood (jackstands)or helper to run car off ground while looking at drive shaft . Is the rear shaking,? it's proubly miscentered on the rear yoke is the front shaking it could be that the front yoke is bent or has a badly installed (off-center) joint .obviously if there's a significant dent in the driveshaft body it proubly needs replaced.if you driveshaft isnt shaking say more then 1/16 what your feeling could / could not be in your tires for for example.bad belts .to check them here again...lol tire off ground so you can turn them by hand ( warm weather test) set a can or brick very close to the tread rotate tire by hand car put otcin neutral: watch the brick or can (ect.)as the tire is close to the object you placed near tread do you see 1/8"difference in the space between the rotating tire and what you placed near the tread ? You do you see 3/16" deviance between half the tread symmetry? That's enough right there to produce and annoying vibration. Below 1/8" diversity you have a good tire .Ok im going to say thanks for listening hope you find out whats going on below
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