depends...for light duty stuff.... Greasable

Heavy Duty gets the Brute Force Sealed...

I have actually ripped a U-joint in half in my old 4x4 as the greasable are weaker by design...

 

I wish I had known this I was just reading elsewhere sealed UJ's are 40% stronger then their greasable counter parts. Are they weaker because of the internal drilling for the grease? This never would have occurred to me. But it does make since now that you think of it. I purchased the usual set of heavy duty greasables, In my situation they will be just fine.

 

i usually get the greaseable ones... but most people that buy the greaseable never grease them.. so i tell them to buy sealed ones... if your going to grease them i would get the greaseable ones

 

I wouldnt recomend installing greasable u-joints. Where they are crossed drilled for the grease to flow makes them extremely weak. They r good if you drive normal, and dont do and towing. Iv'e got a couple of buddies that are into truck pulling and drag racing. They will shatter a greasable u-joint every time.