Rear U-joint

[Larry G]

When should I replace the rear u-joint in my 1994 GMC Sonoma 4.3L?  It has 164k on it.

 

[txab]

Normally when they exhibit being bad. But, if these are factory, non greaseable, I'd replace both of them. But that's just me.

[Larry G]

Thanks for the advise.  Think I'll check them closely this weekend and decide.  My next door neighbor has a 2001 Sonoma 4cyl with over 150k and his rear u-joint wore out and let the drive shaft fall to the ground , while starting up from a stoplight.   I plan to keep it a while longer, as the dipstick doesn't get much below full  after 3000 miles.