Driveshaft questions

Hey guys I posted last week about a jiggle in the rear end of my truck only at take off. Gotten many comments about it possibly being u joints or carrier bearing. I also notice vibration at higher speeds through floor board/gas pedal. Could that be another symptom of driveshaft stuff? TIA
Recommend using only Dana/Spicer driveline parts. The U-joints are available in greaseable and sealed. If you go greaseable, suggest choosing the zerk location on the bearing cap, not in the spider.
I've had both type u-joints with zerk fittings, for what it's worth it didn't make any difference where the zero fitting was located. I'm more concerned how long these sealed u-joints will hold up.