Shaking in 2wd

[ColoradoMTNlivin]

I suspect I have bad ujoints. It shakes on acceleration but not when coasting. Would I have to replace all four u joints or just the ones on the rear driveshaft?

 

[Southern4Runner]

This happened to me but just and to replace the rear

 

[MStudt]

Crawl under and check the rear drive shaft. Should you only have about 1/16" of play, maybe 1/8" at the most.